采用循环加载-卸载的测试方法确定非线性弹性材料Ti-Nb-Ta-O系钛合金的弹性极限和0.2％屈服强度,分别获得了Ti-23 Nb-0.7 Ta-2Zr-1O、Ti-23Nb-0.7Ta-2Zr-1.2O、Ti-23Nb-0.7Ta-2Zr-0.7O、Ti-25Nb-0.7Ta-2Zr-1.2O四种合金的力学性能参数.通过比较发现,随着合金元素含量的提高,合金的弹性极限、屈服强度和抗拉强度提高,但弹性模量也升高,塑性降低.变形率对提高合金弹性极限有显著的作用,而对屈服强度和抗拉强度影响不大.元素含量提高和变形率增大都使拉伸曲线更加平直化.
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