冷轧Ti-50.8Ni-0.4V形状记忆合金相变和超弹性研究

石海洋; 张青来; 韩伟东; 柏秋生; 刘志强

doi:10.14158/j.cnki.1001-3814.20192497

冷轧Ti-50.8Ni-0.4V形状记忆合金相变和超弹性研究

Study on Phase Transformation and Superelasticity of Cold Rolled Ti-50.8Ni-0.4V Shape Memory Alloy

摘要

摘要: 利用金相显微镜、示差量热分析法和拉伸试验对比研究了冷轧和退火态Ti-50.8Ni-0.4V合金的相变及超弹性。结果表明：退火处理对冷轧合金的相变和超弹性（SE）特性具有显著的影响。具有大量位错塞积的冷轧态合金表现为线性SE，而退火态合金呈非线性SE，350～550℃退火态合金表现为两步相变（A→R→M/M→R→A），形状回复率Rr达到96%，具有优异SE特性。600℃和650℃退火态合金发生完全再结晶，随温度的升高R相逐渐消失，其相变分别为（A→R→M）/（M→A）和（A→M）/（M→A），形状回复率R_r值<29%，其SE特性明显变差。

Abstract: The phase transformation and superelasticity of cold rolled and annealed Ti-50.8Ni-0.4Valloys were studied by metallographic microscope, differential calorimetric analysis and tensile test. The results show that annealing treatment has a significant effect on the phase transformation and superelastic(SE)properties of cold rolled alloys.The cold rolled alloy with a large number of dislocation plug product is linear SE, and the annealed alloy is nonlinear SE. The annealed alloy at 350 ℃shows two-step phase transformation (A→R→M/M→R→A). The shape recovery rate R_r is 96%, which has excellent SE characteristics. The annealed alloys at 600 ℃and 650 ℃are completely recrystallized and the R phase disappears with the increase of temperature.The phase transition is(A→R→M)/(M→A)and(A→M)/(M→A), respectively.The shape recovery rate R_r is less than 29%, and the SE characteristics become worse obviously.

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