start-ver=1.4 cd-journal=joma no-vol=67 cd-vols= no-issue=8 article-no= start-page=1997 end-page=2005 dt-received= dt-revised= dt-accepted= dt-pub-year=2023 dt-pub=20230608 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Study on joint characteristics in laser butt welding of AMed and wrought Ti6Al4V plates en-subtitle= kn-subtitle= en-abstract= kn-abstract=Titanium alloy Ti6Al4V has been widely applied to medical, automotive, and aerospace industries due to its excellent properties such as high strength and excellent corrosion resistance. On the other hand, additive manufacturing (AM) technology can give the freedom of design of the products. In order to spread the AMed products, the joining of AMed and wrought products are required, and it is important to understand the joint characteristics. In this study, butt welding of Ti6Al4V plate was conducted by fiber laser in argon shielding, and the joint characteristics of laser weld wrought/wrought, AMed/AMed, and AMed/wrought Ti6Al4V plates were experimentally investigated. The AMed plate has higher tensile strength than wrought plate but the elongation of AMed plate is smaller, since AMed plate has ƒฟf martensite due to rapid cooling during laser irradiation in AM process. Then, the laser weld joint of AMed/AMed plates has higher tensile strength, but smaller elongation than that of wrought/wrought plates. The weld joint of AMed/wrought plates shows good welding state, since small heat input leads to formation of small weld bead with higher hardness between wrought and AMed plates. en-copyright= kn-copyright= en-aut-name=OkamotoYasuhiro en-aut-sei=Okamoto en-aut-mei=Yasuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=ShinonagaTogo en-aut-sei=Shinonaga en-aut-mei=Togo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=OkadaAkira en-aut-sei=Okada en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=OchiAkihiro en-aut-sei=Ochi en-aut-mei=Akihiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=KishimotoRyuya en-aut-sei=Kishimoto en-aut-mei=Ryuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=PityanaSisa en-aut-sei=Pityana en-aut-mei=Sisa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=ArthurNana en-aut-sei=Arthur en-aut-mei=Nana kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=OmoniyiPeter en-aut-sei=Omoniyi en-aut-mei=Peter kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=MahamoodRasheedat en-aut-sei=Mahamood en-aut-mei=Rasheedat kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= en-aut-name=MainaMartin en-aut-sei=Maina en-aut-mei=Martin kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=11 ORCID= en-aut-name=AkinlabiEsther en-aut-sei=Akinlabi en-aut-mei=Esther kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=12 ORCID= affil-num=1 en-affil=Okayama University kn-affil= affil-num=2 en-affil=Okayama University kn-affil= affil-num=3 en-affil=Okayama University kn-affil= affil-num=4 en-affil=Okayama University kn-affil= affil-num=5 en-affil=Okayama University kn-affil= affil-num=6 en-affil=Okayama University kn-affil= affil-num=7 en-affil=National Laser Centre, CSIR kn-affil= affil-num=8 en-affil=National Laser Centre, CSIR kn-affil= affil-num=9 en-affil=University of Johannesburg kn-affil= affil-num=10 en-affil=University of Johannesburg kn-affil= affil-num=11 en-affil=Jomo Kenyatta University of Agriculture and Technology kn-affil= affil-num=12 en-affil=University of Johannesburg kn-affil= en-keyword=Ti6Al4V kn-keyword=Ti6Al4V en-keyword=Joint characteristics kn-keyword=Joint characteristics en-keyword=Laser welding kn-keyword=Laser welding en-keyword=Butt welding kn-keyword=Butt welding en-keyword=Additive manufacturing kn-keyword=Additive manufacturing END start-ver=1.4 cd-journal=joma no-vol=85 cd-vols= no-issue=11 article-no= start-page=405 end-page=412 dt-received= dt-revised= dt-accepted= dt-pub-year=2021 dt-pub=2021111 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Formation Mechanism of Tempering-Induced Martensite in Ti-10Mo-7Al Alloy kn-title=Ti?10Mo?7Al‡‹เ‚ฬฤ–฿‚ต—U‹Nƒ}ƒ‹ƒeƒ“ƒTƒCƒg‚ฬŒ`ฌ‹@\ en-subtitle= kn-subtitle= en-abstract= kn-abstract=The formation mechanism of ƒฟAA?martensite (ƒฟAAMt) induced by tempering at 450?550Ž for a short time was investigated using Ti?10Mo?7Al alloy. The solution treated and quenched (STQ) sample was composed of ƒภ phase and a small amount of ƒฟAAMq, and a large amount of ƒฟAAMt was generated by rapid tempering at 550Ž?3 s using a salt bath. However, ƒฟAAMt was completely transformed into a single ƒภ phase by aging at 200Ž for 3 min. Reversibility was observed between the ƒฟAAMt transformation and the ƒภ reverse transformation. In?situ high?temperature X?ray diffraction measurements revealed that ƒฟAAMq จ ƒภ reverse transformation occurred at 200Ž and that a thermally activated ƒฟAAiso was generated at 450Ž due to the slow heating rate. In?situ optical microscopic observation of STQ sample with rapid lamp heating revealed that ƒฟAAMt was formed during heating process. However, ƒฟAAMt did not generate under following conditions; that is, a slow heating rate, thin sample plate, and a small temperature difference until tempering by preheating. On the other hand, rapid tempering using thick plate from liquid nitrogen (?196Ž) to 250Ž was performed to ensure a sufficient temperature difference, but ƒฟAAMt was not generated at all. From the cross?sectional observation of the STQ plate, it was found that ƒฟAAMq was hardly formed on the surface of the sample, but was formed abundantly inside the sample. On the other hand, in the rapidly tempered plate, a large amount of ƒฟAAMt was distributed in the surface layer than inside sample. These results suggest that the thermal compressive stress induced by rapid heat treatment contributes to the formation of ƒฟ''M. en-copyright= kn-copyright= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=1 ORCID= en-aut-name=YasunoMikiko en-aut-sei=Yasuno en-aut-mei=Mikiko kn-aut-name=ˆภ–์ŽภŠ๓Žq kn-aut-sei=ˆภ–์ kn-aut-mei=ŽภŠ๓Žq aut-affil-num=2 ORCID= en-aut-name=IkemotoMasaki en-aut-sei=Ikemoto en-aut-mei=Masaki kn-aut-name=’r–{‰๋Š๎ kn-aut-sei=’r–{ kn-aut-mei=‰๋Š๎ aut-affil-num=3 ORCID= en-aut-name=AndoHiroyuki en-aut-sei=Ando en-aut-mei=Hiroyuki kn-aut-name=ˆภ“กŠฐK kn-aut-sei=ˆภ“ก kn-aut-mei=ŠฐK aut-affil-num=4 ORCID= en-aut-name=ShimizuIchiro en-aut-sei=Shimizu en-aut-mei=Ichiro kn-aut-name=ด…ˆ๊˜Y kn-aut-sei=ด… kn-aut-mei=ˆ๊˜Y aut-affil-num=5 ORCID= affil-num=1 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=‰ชŽR‘ๅŠw‘ๅŠw‰@Žฉ‘R‰ศŠwŒค‹†‰ศ affil-num=2 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=‰ชŽR‘ๅŠw‘ๅŠw‰@Žฉ‘R‰ศŠwŒค‹†‰ศ affil-num=3 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=‰ชŽR‘ๅŠw‘ๅŠw‰@Žฉ‘R‰ศŠwŒค‹†‰ศ affil-num=4 en-affil=Faculty of Engineering, Okayama University kn-affil=‰ชŽR‘ๅŠwHŠw•” affil-num=5 en-affil=Faculty of Engineering, Okayama University of Science kn-affil=‰ชŽR—‰ศ‘ๅŠwHŠw•” en-keyword=ƒฟ''?martensite kn-keyword=ƒฟ''?martensite en-keyword=thermal stress kn-keyword=thermal stress en-keyword=tempering kn-keyword=tempering en-keyword=in situ observation kn-keyword=in situ observation en-keyword=reverse transformation kn-keyword=reverse transformation END start-ver=1.4 cd-journal=joma no-vol=698 cd-vols= no-issue= article-no= start-page=137854 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2020 dt-pub=202003 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Strain effects on spinodal decomposition in TiO2-VO(2)films on TiO2(100) substrates en-subtitle= kn-subtitle= en-abstract= kn-abstract= We investigate the influence of lattice strain in the c-axis direction on spinodal decomposition in rutile TiO2-VO2 films on TiO2(100) substrates. The [100]-oriented Ti0.4V0.6O2 (TVO) solid-solution films are fabricated on rutile TiO2(100) substrates using a pulsed laser deposition with a KrF excimer laser, and are annealed inside the spinodal region. X-ray diffraction and scanning transmission electron microscopy are employed for characterization. Consequently, the in-plane tensile strain in the c-axis direction promotes the Ti-V interdiffusion in TVO/TiO2(100) under thermal annealing. In contrast, relaxation of the tensile strain results in the occurrence of spinodal decomposition along the c-axis direction in the film. These results indicate that the relaxation of the tensile strain in the c-axis direction is critically important for enabling spinodal decomposition in TVO/TiO2(100). Our work helps deepen the understanding of spinodal decomposition in the TVO film and provides information on achieving novel nanostructures via spinodal decomposition in TVO/TiO2(100). en-copyright= kn-copyright= en-aut-name=MuraokaYuji en-aut-sei=Muraoka en-aut-mei=Yuji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=YoshiiFumiya en-aut-sei=Yoshii en-aut-mei=Fumiya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FukudaTakahiro en-aut-sei=Fukuda en-aut-mei=Takahiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=ManabeYuji en-aut-sei=Manabe en-aut-mei=Yuji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=YasunoMikiko en-aut-sei=Yasuno en-aut-mei=Mikiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=TerashimaKensei en-aut-sei=Terashima en-aut-mei=Kensei kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=WakitaTakanori en-aut-sei=Wakita en-aut-mei=Takanori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=YokoyaTakayoshi en-aut-sei=Yokoya en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= affil-num=1 en-affil=Research Institute for Interdisciplinary Science (RIIS), Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=3 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=4 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=5 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=6 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=7 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= affil-num=8 en-affil=Research Institute for Interdisciplinary Science (RIIS), Okayama University kn-affil= affil-num=9 en-affil= kn-affil= en-keyword=Strain effect kn-keyword=Strain effect en-keyword=Spinodal decomposition kn-keyword=Spinodal decomposition en-keyword=Titanium dioxide kn-keyword=Titanium dioxide en-keyword=Vanadium dioxide kn-keyword=Vanadium dioxide en-keyword=Thin films kn-keyword=Thin films en-keyword=Interdiffusion kn-keyword=Interdiffusion en-keyword=Nanostructure kn-keyword=Nanostructure en-keyword=Pulsed laser deposition kn-keyword=Pulsed laser deposition END start-ver=1.4 cd-journal=joma no-vol=33 cd-vols= no-issue=2 article-no= start-page=1 end-page=8 dt-received= dt-revised= dt-accepted= dt-pub-year=1999 dt-pub=19990427 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Simulation of Deformation of Ni Twinned Nanocrystal Model by Molecular Dynamics en-subtitle= kn-subtitle= en-abstract= kn-abstract=Molecular dynamics simulation of nickel crystal under uniaxial tensile and compressive deformation was performed for single nenocrystal model and twinned nanocrystal model composed of 1550 atoms using EAM (embedded atom method) potential with the object of investigating deformation induced phase tranformation (especially twin deformation). In the case of single nanocrystal model, the evolution and development of twin deformation, (111)[11(2)], is observed under compressive loading in [001] direction, whereas either slip or twin deformation is not recognized under tensile loading. In the case of twinned nanocrystal model, twin, (111)[11(2)], decreases and disappears under tensile loading, and develops under compressive loading, It is suggested from the difference of results between single nanocrystal model and twinned nanocrystal model that it is easy for twin to induce local deformation. en-copyright= kn-copyright= en-aut-name=OmuraYasuhiro en-aut-sei=Omura en-aut-mei=Yasuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=HidaMoritaka en-aut-sei=Hida en-aut-mei=Moritaka kn-aut-name=”๒“cŽ็F kn-aut-sei=”๒“c kn-aut-mei=Ž็F aut-affil-num=2 ORCID= en-aut-name=SakakibaraAkira en-aut-sei=Sakakibara en-aut-mei=Akira kn-aut-name=ๅŒดธ kn-aut-sei=ๅŒด kn-aut-mei=ธ aut-affil-num=3 ORCID= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Graduate School of Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering affil-num=4 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=31 cd-vols= no-issue=2 article-no= start-page=11 end-page=20 dt-received= dt-revised= dt-accepted= dt-pub-year=1997 dt-pub=19970328 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Internal Structure and Phase Transformation of Ti-V Alloy Fine Particles en-subtitle= kn-subtitle= en-abstract= kn-abstract=Fine particles of Ti-V alloy were prepared by means of arc method and were investigated on internal structure and phase transformation using HR-TEM and EDS. Martensite phase was observed in a particle containing comparatively low concentration of V, and ƒึ phase was also found to exist in a nearly 15% V particle. The structure of the ƒึ phase in the fine particle is remarkably expanded in comparison with the bulk sample, and the ƒึ phase is unstable, so that it has disappeared in a few seconds during TEM observation. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=IshiiKouta kn-aut-sei=Ishii kn-aut-mei=Kouta aut-affil-num=1 ORCID= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=2 ORCID= en-aut-name=HidaMoritaka en-aut-sei=Hida en-aut-mei=Moritaka kn-aut-name=”๒“cŽ็F kn-aut-sei=”๒“c kn-aut-mei=Ž็F aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=31 cd-vols= no-issue=2 article-no= start-page=1 end-page=10 dt-received= dt-revised= dt-accepted= dt-pub-year=1997 dt-pub=19970328 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Microstructure of Oxide Layers Formed on Magnesium Surface at Elevated Temperature en-subtitle= kn-subtitle= en-abstract= kn-abstract=The microstructure of oxidizing magnesium at elevated temperatures has been studied using HR-TEM, SEM and EDS. Two kinds of thin magnesium specimen for TEM observation were prepared. One was oxidized after preparing TEM foil of magnesium, the other was prepared from an oxidized bulk magnesium for observing the cross-section of oxide/Mg interfacial region. In the former, several oxides(MgO) morphologies were observed depending on the temperature and time of the oxidization. The growth of needle-like oxides formed at 573K and mottled oxides formed at 773K were recognized as a remarkable phenomenon belonging to the local oxidization. These oxides were composed of poly-crystal. The thin uniform oxidization layer was also observed in all conditions. In the cross-sectional observation, the local oxide layer, nearly 300nm in thickness, on the matrix(Mg) were observed. The thin uniform oxidized layer of bulk samples was identified as a kind of modified layer (~40nm in thickness) in which the formation of HR-TEM lattice fringes were prevented by the strain due to the slight oxidization. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=ArisawaHideaki kn-aut-sei=Arisawa kn-aut-mei=Hideaki aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SongZhi-Yi kn-aut-sei=Song kn-aut-mei=Zhi-Yi aut-affil-num=2 ORCID= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=3 ORCID= en-aut-name=HidaMoritaka en-aut-sei=Hida en-aut-mei=Moritaka kn-aut-name=”๒“cŽ็F kn-aut-sei=”๒“c kn-aut-mei=Ž็F aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering affil-num=4 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=21 cd-vols= no-issue=2 article-no= start-page=1 end-page=7 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870305 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Depth Dependency of Hardness Change of Ti-Mo Alloys en-subtitle= kn-subtitle= en-abstract= kn-abstract=We investigated the effects of resolved interstitial oxygen or nitrogen atoms and of quenched-in strain on the hardening of the single crystals grown from molten Ti-14 and 20wt pct Mo alloys. The aging treatment at 623K in atmosphere much more increased in the hardness of specimen surface than that in argon atmosphere. The quenched-in compressive stress enhanced age hardening due to omega formation. We surveyed in detail the hardness changes toward the center of plate-shaped single crystal. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TakemotoYoshito kn-aut-sei=Takemoto kn-aut-mei=Yoshito aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=HidaMoritaka kn-aut-sei=Hida kn-aut-mei=Moritaka aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of Industrial Science affil-num=2 en-affil= kn-affil=Department of Industrial Science END start-ver=1.4 cd-journal=joma no-vol=25 cd-vols= no-issue=2 article-no= start-page=1 end-page=8 dt-received= dt-revised= dt-accepted= dt-pub-year=1991 dt-pub=19910328 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Mechanical Characteristics of Cast Ti Fiber-Reinforced Mg Composite en-subtitle= kn-subtitle= en-abstract= kn-abstract=Tensile strength and elongation of cast magnesium reinforced with titanium fiber were measured by tensile test. The pull-out test of a titanium rod partially embedded in a magnesium matrix was performed to evaluate interfacial bonding strength between magnesium and titanium. It was found that when the fiber volume fraction was changed from 1% to 14%, the tensile strength was improved with increase of volume fraction, while the improvement of elongation tended to be restrained beyond the volume fraction of 10%. The interfacial strength was revealed to be strong, and this was substantiated by the scanning electron microscopy showing an excellent wettability between the titanium fiber and the magnesium matrix. en-copyright= kn-copyright= en-aut-name=OkadaHiroyuki en-aut-sei=Okada en-aut-mei=Hiroyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=HidaMoritaka en-aut-sei=Hida en-aut-mei=Moritaka kn-aut-name=”๒“cŽ็F kn-aut-sei=”๒“c kn-aut-mei=Ž็F aut-affil-num=2 ORCID= en-aut-name=SakakibaraAkira en-aut-sei=Sakakibara en-aut-mei=Akira kn-aut-name=ๅŒดธ kn-aut-sei=ๅŒด kn-aut-mei=ธ aut-affil-num=3 ORCID= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering affil-num=4 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=24 cd-vols= no-issue=2 article-no= start-page=1 end-page=9 dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19900329 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Fine Particles of Ti and Ti-Mo Alloy Prepared by Gas Evaporation en-subtitle= kn-subtitle= en-abstract= kn-abstract=Fine particles of Ti-Mo alloy were prepared by evaporation. When Ti-40at % Mo alloy was evaporated on tungsten filament, fine particles of Ti contaminated with W were obtained. These particles were polyhedron in shape and 10`250nm in diameter. Average diameter and size distribution increased with pressure of argon gas (100`600 Torr). When pure Ti was placed on the Mo filament and evaporated from melt down of heated Mo filament in helium gas, fine particles of pure Ti and of Ti-Mo alloy were obtained. In this case, Ti particles were of indeterminate form and of several tens nm in diameter, and their diffraction pattern was of common ƒฟ-Ti. On the other hand, composition of the Ti-Mo particles was determined to be 18at % Mo by an analysis of EDX. Structure of Ti-Mo particles could not be determined because their diameters were more than 600nm. The temperature of Mo filament, for the most part, was about 1800Ž, and there pure Ti particles were produced. The temperature of the fused part of the filament was locally higher than 2600Ž, and there Ti-Mo particles were produced. Fine structures of contact region among some Ti particles were observed with HRTEM. en-copyright= kn-copyright= en-aut-name=UmemotoMasayuki en-aut-sei=Umemoto en-aut-mei=Masayuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=2 ORCID= en-aut-name=SakakibaraAkira en-aut-sei=Sakakibara en-aut-mei=Akira kn-aut-name=ๅŒดธ kn-aut-sei=ๅŒด kn-aut-mei=ธ aut-affil-num=3 ORCID= en-aut-name=HidaMoritaka en-aut-sei=Hida en-aut-mei=Moritaka kn-aut-name=”๒“cŽ็F kn-aut-sei=”๒“c kn-aut-mei=Ž็F aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering affil-num=4 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=28 cd-vols= no-issue=2 article-no= start-page=13 end-page=20 dt-received= dt-revised= dt-accepted= dt-pub-year=1994 dt-pub=19940315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=X-Ray Topographic Observation of Strain Generated by Thin Film (TiN) on Silicon Surface en-subtitle= kn-subtitle= en-abstract= kn-abstract=The strain in Si substrate induced by locally ion-plated thin film of TiN was observed by X-ray topograph (Lang technique). Circular TiN film was deposited on one side of the Si surface. In all topographs the highest blackness attributed to kinematical diffraction effect occurred at the film edge. Rosette pattern with four-lobes was observed around the film. Blackness as a whole increased with the film thickness. Strain was observed in the depth direction of substrate by limited projection method. When the slit width was narrowed, the kinematical images disappeared, and white images appeared at the film edge. All the contrast disappeared when the TiN film was completely removed in boiling HNO(3). The strain induced by the film deposition was proved to be elastic. en-copyright= kn-copyright= en-aut-name=KusumotoHisao en-aut-sei=Kusumoto en-aut-mei=Hisao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=HidaMoritaka en-aut-sei=Hida en-aut-mei=Moritaka kn-aut-name=”๒“cŽ็F kn-aut-sei=”๒“c kn-aut-mei=Ž็F aut-affil-num=2 ORCID= en-aut-name=SakakibaraAkira en-aut-sei=Sakakibara en-aut-mei=Akira kn-aut-name=ๅŒดธ kn-aut-sei=ๅŒด kn-aut-mei=ธ aut-affil-num=3 ORCID= en-aut-name=NishidaNorihide en-aut-sei=Nishida en-aut-mei=Norihide kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=5 ORCID= en-aut-name=YamadaMasuo en-aut-sei=Yamada en-aut-mei=Masuo kn-aut-name=ŽR“c‰v’j kn-aut-sei=ŽR“c kn-aut-mei=‰v’j aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering affil-num=4 en-affil= kn-affil=Industrial Technical Center of Okayama Prefecture affil-num=5 en-affil= kn-affil=Department of Mechanical Engineering affil-num=6 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=28 cd-vols= no-issue=2 article-no= start-page=1 end-page=7 dt-received= dt-revised= dt-accepted= dt-pub-year=1994 dt-pub=19940315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Internal Structure and Phase Transformation of Ti-Mo Alloy Fine Particles en-subtitle= kn-subtitle= en-abstract= kn-abstract=Fine particles of Ti-Mo alloy have been prepared by means of arc method, and investigated on internal structure and phase transformation using HR-TEM and EDS. Martensite phase was observed in a particle containing comparatively low concentration of Mo, and ƒึ phase was also found to exist in a nearly 14 % M0 particle. The structure of the ƒึ phase in the fine particle is expanded and remarkably unstable in comparison with the bulk sample, so that it has disappeared in a few seconds during TEM observation. Moreover, the ƒภ structure of Ti-Mo particles has changed to the unusual fcc phase with irradiation of a strong electron beam. en-copyright= kn-copyright= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=1 ORCID= en-aut-name=SakakibaraAkira en-aut-sei=Sakakibara en-aut-mei=Akira kn-aut-name=ๅŒดธ kn-aut-sei=ๅŒด kn-aut-mei=ธ aut-affil-num=2 ORCID= en-aut-name=HidaMoritaka en-aut-sei=Hida en-aut-mei=Moritaka kn-aut-name=”๒“cŽ็F kn-aut-sei=”๒“c kn-aut-mei=Ž็F aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=30 cd-vols= no-issue=2 article-no= start-page=1 end-page=7 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19960329 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Nature of Brittle Fracture in Aged Ti-Mo Alloy en-subtitle= kn-subtitle= en-abstract= kn-abstract=The mechanism of brittle fracture in Ti-14mass % Mo alloy aged for 1x10(6)s at 623K was studied using transmission electron microscopy (TEM) and dynamic hardness test (DHT) on the structure deformed by means of tensile elongation at elevated temperature or cold rolling. Many band products were observed by TEM in either deformed specimens. These band products were identified to neither slips nor twinning bands, moreover, they were different from ƒฟ , ƒฟ ' and ƒฟ " phases. The band product consisted of ƒภ phase and granular unknown phase which was transformed by deformation from ƒึ phase. The newly discovered phase, named ƒภ" phase, in the band products had a body-centered triclinic structure. The ƒภ" was similar to the ƒึ zone with respect to the morphology and the concentration of Mo, but it resembled ƒภ in structure. The result of DHT on the band products and the matrix showed that the band products were softer than the matrix. It is suggested that the band products are easily deformed because of the disappearance of obstacles such as ƒึ phase, and consequently behave like paths to lead cracks preferentially. en-copyright= kn-copyright= en-aut-name=TakemotoYoshito en-aut-sei=Takemoto en-aut-mei=Yoshito kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=1 ORCID= en-aut-name=HidaMoritaka en-aut-sei=Hida en-aut-mei=Moritaka kn-aut-name=”๒“cŽ็F kn-aut-sei=”๒“c kn-aut-mei=Ž็F aut-affil-num=2 ORCID= en-aut-name=SakakibaraAkira en-aut-sei=Sakakibara en-aut-mei=Akira kn-aut-name=ๅŒดธ kn-aut-sei=ๅŒด kn-aut-mei=ธ aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanichal Engineering affil-num=2 en-affil= kn-affil=Department of Mechanichal Engineering affil-num=3 en-affil= kn-affil=Department of Mechanichal Engineering END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=1997 dt-pub=19970930 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=ƒภŒ^Ti-Mo‡‹เ‚ฬ’†Šิ‘Jˆฺƒึ‘Š‚ฦ•ฯ‘ิŒ^•ฯŒ`‹““ฎ‚ษŠึ‚ท‚้Œค‹† en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=’|Œณ‰ร—˜ kn-aut-sei=’|Œณ kn-aut-mei=‰ร—˜ aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=‰ชŽR‘ๅŠw END