材料期刊网

利用高温氧化和氢化等方法模拟在聚变堆环境中多种 V-Cr-Ti-Al-Si合金因吸O和H而造成的脆性，并利用国外测试的V合金中子辐照后性能数据， 分析了V合金的中子辐照脆性.V合金在450℃～600℃惰性气体中的高温氧化符合抛物线 规律，除V4Ti3Al合金外，O含量升高使合金的延性降低.H、O联合作用下的V合金表现出了很 强的氢脆敏感性.对含O量为800 μg/g的V4Cr4Ti合金，当H含量超过50 μg/g后表现出明显 的拉伸脆性.中子辐照使V合金的屈服强度升高，而塑性降低，特别是低于400℃的低温中子 辐照，V合金表现出很强的辐照致脆倾向.研究中发现V合金吸氢、中子辐照和形变后的强化 具有等强的降低合金塑性的作用，为此建议采用细晶强化来解决V合金的氢脆和辐照致脆问 题.

The brittleness of several V-Cr-Ti-Al-Si alloys caus ed by the pickup of oxygen and hydrogen in fusion reactor environments was studi ed by using a simulation method of high temperature oxidation and hydrogenation. The neutron irradiation induced ductility loss was also studied by using experim ental data from references.The results showed that the oxidation kinetic of V4Cr 4Ti alloy exhibited parabolic behavior in a flowing argon gas with low partial p ressure oxygen from 450℃ to 600℃.Alloys showed a ductility loss with increa sing oxygen concentration with an exception of V4Ti3Al alloy.The alloys showed m uch stronger sensitivity to hydrogen embrittlement when hydrogen acts synergisti ca lly with oxygen.Neutron irradiation,especially those at temperature lower than 4 00℃,caused great loss in the ductility of the alloys or even brittle failure un der tensile test.It was also found that hydrogen,neutron irradiation an d strain hardening had the same tendency to reduce the ductility of the alloys.S o it was supposed that a way of fine grain strengthening should be taken to impr ove the properties of the alloys against the hydrogen embrittlement and the neut ron irradiation induced brittleness.