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(Nb)/(Nb, Ti)5Si3二相合金の機械的性質に及ぼすラメラー間隔の影響

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Title: (Nb)/(Nb, Ti)5Si3二相合金の機械的性質に及ぼすラメラー間隔の影響
Other Titles: Effect of Lamellar Spacing on the Mechanical Properties of (Nb)/(Nb, Ti)5Si3 Two-Phase Alloys
Authors: 関戸, 信彰1 Browse this author
木村, 好里2 Browse this author
韋, 富高3 Browse this author
三浦, 誠司4 Browse this author →KAKEN DB
三島, 良直5 Browse this author
Authors(alt): Sekido, Nobuaki1
Kimura, Yoshisato2
Wei, Fu-Gao3
Miura, Seiji4
Mishima, Yoshinao5
Keywords: niobium alloy
intermetallic compound
multi-phase alloy
eutectoid decomposition
lamellar spacing
room temperature toughness
high temperature strength
Issue Date: 1-Nov-2000
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: 64
Issue: 11
Start Page: 1056
End Page: 1061
Publisher DOI: 10.2320/jinstmet1952.64.11_1056
Abstract: Effects of lamellar spacing on the mechanical properties of (Nb)/(Nb, Ti)5Si3 two-phase alloys with a fine lamellar structure have been investigated for an improvement in room-temperature toughness and high-temperature strength. Lamellar spacing of the alloy are controlled, without changing the volume fraction and composition of each phase, by varying annealing temperature for the decomposition of high-temperature phase (Nb, Ti)3Si into (Nb) and (Nb, Ti)5Si3. A Time-Temperature-Transformation diagram (TTT diagram) was determined for a Nb-25 mol%Si-10 mol%Ti alloy. It was found that the decomposition of (Nb, Ti)3Si in the Nb-Si-Ti system is kinetically faster than that of Nb3Si in the binary Nb-Si system. Average lamellar spacing, λ , of the alloy is characterized by the degree of super-cooling, ΔT, following a relationship as “λ∝1⁄ΔT”. Coarse lamellar structure shows better room temperature compressive plastic strain before fracture and higher elevated temperature strength. The alloys investigated in this study show superior compressive strength at over 1000°C as compared with some commercial Ni-based superalloys.
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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