NiTi形状记忆合金马氏体相变研究

Study on Martensitic Phase Transformation of NiTi Shape Memory Alloy

以NiTi合金为研究对象,在万能试验机上采用原位拉伸方法研究其马氏体相变的失稳情况。结果表明,NiTi合金马氏体形核时的应力应变曲线具有非线性变化特征。马氏体合并时,相变潜热增加了马氏体的形核功。马氏体分裂时,应力波动值较低。

The martensite phase transformation of NiTi shape memory alloy was studied by in situ stretch method. The results show that the stress-strain curve of the martensite nucleation is nonlinear variation. The nucleation energy of the martensitic increases due to the latent heat of phase change when martensite merge, and the stress fluctuating value is low when martensite break up.