【摘要】 采用电阻、热膨胀、磁致伸缩及光学金相等试验方法研究了多晶Ｎｉ２．１Ｍｎ０．９Ｇａ０．９Ｃ０．１ 合金的马氏体相变特征．结果表明：Ｎｉ２．１Ｍｎ０．９Ｇａ０．９Ｃ０．１合金在４００～１００Ｋ之间发生两次相 变，第一次为马氏体相变，它的热滞后比较小，马氏体相的电阻率高于母相的电阻率；而 第二次相交的结构变化尚未澄清，它的热滞后比较大，新相的电阻率低于母相的电阻率． 马氏体相变时，合金结晶方向长度收缩，磁致伸缩急剧减小．合金中马氏体基本为相互 平行的片状组织．更多还原

【Abstract】 The martensitic transformation of a polycrystal Ni2.1Mn0.9Ga0.9C0.1 alloy has been investigated by using the measurement of resistivity, dilation, magnetostriction and optical microscopy observation. The results show that there is an unknown transformation below the temperture of martensitic transformation between 400K - 100K for the alloy. In the case of martensitic transformation, the thermal hysteresis of martensitic transformation is narrow, and the resistivity of martensite is higher than that of austenite. The second transformation shows a wider thermal hysteresis, and the resisitivity of new phase is smaller than that of austenite. During the martensitic transformation, both the length of alloy and the magnetostriction decrease along the direction of solidification. The morphology of martensites is of parallel plates.更多还原