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借助于Ｆｅ－Ｍｎ－Ｓｉ合金层错几率Ｐｓｆ的Ｘ射线测量，计算了Ｐｓｆ与合金成分的关系，得到Ｆｅ－Ｍｎ－Ｓｉ三元系的１／Ｐｓｆ表达式．结合层错形核的热力学模型，经回归得Ｆｅ－Ｍｎ－Ｓｉ合金ｆｃ（γ）→ｈｃｐ（ε）马氏体相变的临界相变驱动力和Ｐｓｆ的关系式，进而得到临界相变驱动力与合金成分的关系．借助Ｐｓｆ建立了成分与相变驱动力之间的关系，结合有关热力学分析计算得到的Ｆｅ－Ｍｎ－Ｓｉ合金γ和ε两相Ｇｉｂｂｓ自由能曲线，预报了Ｆｅ－Ｍｎ－Ｓｉ三元系合金的ｆｃｃ（γ）→ｈｃｐ（ε）马氏体相变的温度．
The relationship between Psf and alloy composition was calculated by means of X-ray measurement of stacking fault probability Psf of Fe-Mn-Si alloy, and 1 / Psf expression of Fe-Mn-Si ternary system was obtained. The critical phase transformation driving force and Psf of the martensite transformation of Fe-Mn-Si alloy fc (γ) → hcp The relationship between force and alloy composition. Psf was used to establish the relationship between the composition and the driving force of phase transition. Based on the Gibbs free energy curve of γ and ε phase of Fe-Mn-Si alloy calculated by thermodynamic analysis, fcc (γ) → hcp (ε) Martensitic transformation temperature.