一、前 言 工业用Ti-6Al-4V合金在其生产和使用过程中无疑会带入微量氢。按照传统的材料性能试验(拉伸试验)和力学分析方法,微量氢对其性能并无多大影响。只有当其含量较高(超过125ppm)时,其性能才会显著降低。然而,近年来,Ti-6Al-4V合金在使用过程中,人们发现尽管微量氢的存在并不使其常规性能下降,却有可能引起脆断事故的发生。这样,使得人们开始采用新的力学性能试验方法—断裂力 I. Introduction Ti-6Al-4V industrial alloy in the production and use of its process will undoubtedly bring trace hydrogen. According to the traditional material properties test (tensile test) and mechanical analysis, trace hydrogen has little effect on its performance. Only when its content is high (more than 125ppm), its performance will be significantly reduced. However, in recent years, Ti-6Al-4V alloy in use, it was found that although the presence of trace amounts of hydrogen does not make its conventional performance degradation, it is likely to cause brittle fracture. In this way, people started to adopt the new mechanical property test method - fracture force