2024-03-29T08:09:01Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/751272022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139(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Effect of Lamellar Spacing on the Mechanical Properties of (Nb)/(Nb, Ti)5Si3 Two-Phase Alloys関戸, 信彰Sekido, Nobuaki木村, 好里Kimura, Yoshisato韋, 富高Wei, Fu-Gao1000050199949三浦, 誠司Miura, Seiji三島, 良直Mishima, Yoshinaoopen accessniobium alloyintermetallic compoundmulti-phase alloymicrostrucuteeutectoid decompositionlamellar spacingroom temperature toughnesshigh temperature strength563Effects 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.日本金属学会2000-11-01jpnjournal articleVoRhttp://hdl.handle.net/2115/75127https://doi.org/10.2320/jinstmet1952.64.11_10560021-48761880-6880AN00062446日本金属学会誌Journal of the Japan Institute of Metals641110561061https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/75127/1/J.%20Jpn%20Inst.%20Metal%2064%2811%29%201056.pdfapplication/pdf891.13 KB2000-11-01