| Critical driving force for martensitic transformation fcc (γ)→hcp(ε) in Fe-Mn-Si shape memory alloys |
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| 引用本文： | 金学军
,徐祖耀
,李麟.Critical driving force for martensitic transformation fcc (γ)→hcp(ε) in Fe-Mn-Si shape memory alloys[J].中国科学E辑(英文版),1999,42(3):266-274. |
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| 作者姓名： | 金学军 徐祖耀 李麟 |
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| 作者单位： | JIN Xuejun XU Zuyao (T. Y. Hsu
(Department of Materials Science，Shanghai Jiao Tong University，Shanghai 200030，China)
LI Lin
( Department of Materials Science and Engineering，Shanghai University，Shanghai 200072，China) |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant No. 59671023). |
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| 摘 要： | By the application of Chou's new geometry model and the available data from binary Fe-Mn, Fe-Si and Mn-Si systems, as well as SGTE DATA for lattice stability parameters of three elements from Dinsdale, the Gibbs free energy as a function of temperature of the fcc(γ) and hep(ε) phases in the Fe-Mn-Si system is reevaluated. The relationship between the Neel temperature of the γ phase and concentration of constituents in mole fraction, is fitted and verified by the experimental results. The critical driving force for the martensitic transformation fcc (γ)→ hep (ε), △ G_C~(γ→ε), defined as the free energy difference between γ and ε phases at M_s of various alloys can also be obtained with a known M_s. It is found that the driving force varies with the composition of alloys, e. g. △ G_C~(γ→ε) = - 100.99 J/mol in Fe-27.0Mn-6.0Si and △ G_C~(γ→ε) = - 122.11 J/mol in Fe-26.9Mn-3.37Si. The compositional dependence of critical driving force accorded with the expression formulated by Hsu of the
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