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本文通过对改进技术研制的Ti-50.0at%Ni单晶形状记忆合金进行力热耦合实验,得到不同温度下的宏观应力应变曲线,探讨了温度对马氏体相变特性的影响规律,分析了此材料的形状记忆性、超弹性能等一系列力学性能,从而对它的力学特性有了更深入全面的了解。由此发现,此TiNi单晶具有非常好的形状记忆性能,其最大可恢复应变高达10.83%,达到理论计算值。而由于强化机制的减弱,其塑性变形屈服强度较低,只呈现部分超弹性。
In this paper, the mechanical and thermal coupling experiments of Ti-50.0at% Ni single crystal shape memory alloy developed by the improved technology were carried out to obtain the macroscopic stress-strain curves at different temperatures, and the influence of temperature on the martensitic transformation was discussed. The material’s shape memory, superelastic properties and a series of mechanical properties, and thus its mechanical properties have a more in-depth understanding. It was found that this TiNi single crystal has a very good shape memory properties, the maximum recoverable strain up to 10.83%, to reach the theoretical value. However, due to the weakening mechanism, the yield strength of plastic deformation is lower, showing only partial hyperelasticity.