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MoSi2-Mo5Si3共晶材の組織および硬さに及ぼすNb, Vの影響

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Title: MoSi2-Mo5Si3共晶材の組織および硬さに及ぼすNb, Vの影響
Other Titles: Effect of Niobium or Vanadium Addition on the Microstructure and Hardness of MoSi2-Mo5Si3 Eutectic Alloys
Authors: 福井, 俊彦1 Browse this author
上野, 俊吉2 Browse this author
田中, 良平3 Browse this author
三浦, 誠司4 Browse this author →KAKEN DB
三島, 良直5 Browse this author
Authors(alt): Fukui, Toshihiko1
Ueno, Shunkichi2
Tanaka, Ryohei3
Miura, Seiji4
Mishima, Yoshinao5
Keywords: molybdenum-silicide
eutectic materials
niobium additions
vanadium additions
Issue Date: 1-May-1999
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals
Volume: 63
Issue: 5
Start Page: 613
End Page: 616
Publisher DOI: 10.2320/jinstmet1952.63.5_613
Abstract: Effects of Nb or V additions on microstructure and hardness of MoSi2/Mo5Si3 eutectic alloys are investigated for the improvement of room temperature toughness of multi-phase intermetallic alloys based on MoSi2. Alloys prepared by the argon arc melting process have compositions of 4-23 mol%Nb or 10-19 mol%V which substitutes Mo in MoSi2 and Mo5Si3 phases. Examinations are made on microstructural observation by back scattered electron image, X-ray diffraction for phase identification, the concentration of Nb or V in the constituent phases by EPMA, and Vickers hardness of the multi-phase alloys in both macro- and microscopic scales. The phase constitution changes from the two-phase, MoSi2(C11b) and (Mo, Nb)3Si5, to the three-phase, MoSi2(C11b)/(Mo, Nb)Si2(C40)/(Mo, Nb)5Si3, with increasing Nb additions. In the series of alloys with V additions, a similar shift from the two- to the three-phase is accompanied with increasing V addition. Macroscopic hardness of the multi-phase alloys with Nb addition exhibits a complex concentration dependence, in which with increasing Nb content, the hardness first decreases, exhibits a minimum and then increases back. The reason could be attributed to the fact that the hardnesses of the C40 and C11b phase have individual dependence on Nb concentration as revealed by micro-scale hardness measurement. For the improvement in toughness, Nb additions to the eutectic alloys may be preferred because the MoSi2/Mo5Si3 eutectic microstructure is fine as compared with that obtained by the V addition.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 三浦 誠司

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