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借助于 3种成分Fe_Mn_Si合金层错几率的X射线测量 ,计算了层错几率与合金成分的关系 ,得到Fe_Mn_Si三元系的层错几率的倒数 1 /Psf一个表达式 .结合层错形核的热力学模型 ,经回归得Fe_Mn_Si合金γ(f.c .c .)→ε(h .c .p)马氏体相变的临界相变驱动力和层错几率的关系为ΔGc=6 7.487+ 0 .1 775 /Psf(J/mol) ,显示临界相变驱动力与层错几率存在线性关系 ,并随层错几率下降而增加 .通过层错几率和成分及相变驱动力之间的关系 ,结合有关热力学分析计算 ,可预测Fe_Mn_Si三元系合金的γ(f.c .c)→ε(h .c .p)马氏体相变的Ms 温度 .
With the help of the X-ray measurement of the probability of layer faults of Fe_Mn_Si alloy, the relationship between the stacking fault probability and the composition of the alloy was calculated and an inverse 1 / Psf expression of the stacking fault probability of Fe_Mn_Si ternary system was obtained. According to the thermodynamic model, the relationship between the critical phase transformation driving force and the stacking fault probability for the regression of the Fe (subscript m) -c alloy γ (fc .c.) → ε (h .c. P) martensite is ΔGc = 6 7.487 + 775 / Psf (J / mol), showing that there is a linear relationship between the critical phase change driving force and the stacking fault probability, and increases with the stacking fault probability decreasing.Based on the relationship between the stacking fault probability and the composition and phase change driving force, Thermodynamic analysis and calculation can predict Ms temperature of γ (fc .c) → ε (h .c. P) martensitic transformation of Fe_Mn_Si ternary alloy.