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用在(Ms+30℃)温度下的拉伸实验和差示扫描量热仪(DSC)较系统地研究了 Ti44Ni47Nb9 宽滞后形状记忆合金应力诱发马氏体的相变行为。研究结果表明:当形变量达到 14%左右时,应力诱发马氏体相变过程基本完成。应力诱发马氏体的逆相变温度间隔要比热诱发马氏体约小一个数量级。形变对该合金应力诱发马氏体的逆转变开始温度、逆转变温度间隔以及相变潜热均有明显影响,随着拉伸变形量的增加而增加。而在随后的冷却循环中,相变潜热和马氏体相变开始温度均随着形变的增加缓慢降低。
The phase transition behavior of stress-induced martensite in Ti44Ni47Nb9 wide-hysteretic shape memory alloy was systematically investigated by tensile test and differential scanning calorimeter (DSC) at (Ms + 30 ℃). The results show that when the amount of deformation reaches about 14%, the stress-induced martensitic transformation process is basically completed. The stress-induced martensite reverse phase transition temperature interval is about an order of magnitude smaller than the heat-induced martensite. Deformation has a significant effect on the initial transformation temperature, the reverse transformation temperature interval and the latent heat of transformation of the alloy induced stress-induced martensite, and increases with the increase of tensile deformation. In the subsequent cooling cycle, both the latent heat of transformation and the onset temperature of martensitic transformation slowly decrease with the increase of deformation.