Abstract The martensitic transformation in Ni 50 Mn 34.5 In 15.5 single crystal was studied by electrical resistivity measurements under controlled and constant uniaxial stress. We observed that the kinetics of the transformation under uniaxial stress, defined as the derivative of the volume fraction of martensite (austenite) with respect to time, present two maxima during heating at a constant rate of 3 K/min. An additional energy is required for the complete transformation to happen and there is a distortion in the hysteretic cycle depending on the rate. The interaction between transformed volume and untransformed volume and inter-variant conversion could be responsible for this distortion adding a local internal stress in the material. The transformation during heating is consequently isothermal. However, a new increase of the austenite restoration rate occurs in an avalanche form when additional superheating leads to an increase in the driving force that does not compensate any more the total strain energy.

中文翻译：

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Ni-Mn-In Heusler 单晶中单轴应力证明的奥氏体雪崩

摘要 通过在受控和恒定单轴应力下的电阻率测量研究了Ni 50 Mn 34.5 In 15.5 单晶中的马氏体转变。我们观察到单轴应力下的转变动力学，定义为马氏体（奥氏体）体积分数对时间的导数，在以 3 K/min 的恒定速率加热期间呈现两个最大值。完全转换需要额外的能量，并且滞后循环会根据速率发生畸变。变形体积和未变形体积之间的相互作用以及变量间转换可能是造成这种变形的原因，在材料中增加了局部内应力。加热过程中的转变因此是等温的。然而，