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通过磁化率、电阻率和组织结构分析及形状记忆效应测定等手段研究了 Fe- 2 4 Mn- Ge合金顺磁 -反铁磁转变和 γ→ ε马氏体转变 .结果表明 :Ge降低尼耳温度 (TN)的同时增加合金的磁化率 ,尼尔点所对应磁化率峰值随 Ge含量的上升变高变尖 ,并促使合金由泡利顺磁性向具有局域磁矩的居里 -外斯顺磁性转变 .Ge还显著提高 Fe- 2 4 Mn合金奥氏体与 ε马氏体的电阻率 ,且提高 ε马氏体电阻率作用明显大于奥氏体 .Ge含量升高时 ,ε马氏体量明显减少 ,同一晶粒内 ε马氏体相互交截程度减弱 ,表明 Ge抑制 Fe- 2 4 Mn合金的 γ→ ε马氏体转变 ,但 Ge对 Fe- 2 4 Mn合金的形状记忆效应影响并不显著
The paramagnetic-antiferromagnetic transitions and γ → ε martensitic transformations of Fe-2 4 Mn-Ge alloys were investigated by means of magnetic susceptibility, resistivity and microstructure analysis, and shape memory effect measurements. The results show that Ge decreases the content of Ni Temperature (TN) increases the magnetic susceptibility of the alloy, the peak value of the magnetic susceptibility corresponding to the Neil point becomes higher with the increase of the Ge content, and the alloy is induced from the Pauli paramagnetic to the Curie- Paramagnetic transformation.Ge also significantly increased the resistivity of austenite and ε-martensite in Fe-2 4 Mn alloy and the effect of increasing ε-martensite resistivity was significantly greater than that of austenite.When the content of Ge increased, The amount of ε-martensite intergranularly decreases in the same grain, indicating that Ge suppresses γ → ε martensitic transformation of Fe-2 4 Mn alloy. However, the effect of Ge on the shape memory effect of Fe-2 4 Mn alloy The impact is not significant