【摘要】 用静电音频内耗仪测试了Ｆｅ－Ｍｎ－Ｓｉ－Ｃｒ形状记忆合金在－１００～３００°Ｃ温度范围的内耗及模量变化，研究了γ→ε马氏体相变及其逆相变的内耗特征．结果表明，γ→ε马氏体相变及其逆相变具有不同的机制；在相变过程中未出现软模现象，可见该合金的层错形核可能无需点阵软化．相变过程中的模量变化归因于ε相的模量高于γ相的模量．更多还原

【Abstract】 Audio frequency internal friction and elastic modulus (square of frequency) of an Fe Mn Si Cr shape memory alloy are measured as a function of temperature from -100°C to 300°C using an electrostatic audio frequency internal friction instrument. The internal friction characteristics of the artensitic transformation and the reverse transformations are investigated. The results show that the mechanisms of γ→ε martensitic and ε→γ reverse transformations are different. The elastic modulus softening does not occur during these transformations, which implies that the spontaneous nucleation by stacking faults would not need lattice softening. The change of modulus during transformation is due to the fact that the modulus of the ε phase is higher than that of the γ phase.更多还原