(1. 四川大学 材料科学与工程学院, 成都 610065;
2. 中国核动力研究设计院 核燃料及材料国家重点实验室,
成都 610041;
3. 成都飞机工业有限责任公司, 成都 610091)
摘 要: 研究了含氢量为11%(质量分数)的一种Ti-Al-Zr合金在室温和100℃时的氢致延迟断裂行为。结果表明该合金的裂纹扩展分两个阶段:在第1阶段中,裂纹扩展速率da/dt随着应力强度因子KⅠ的增加而稍稍增加(室温下)或者不变(100℃时);在第2阶段da/dt随KⅠ增加而迅速增加,当KⅠ达到KⅠH时,试样失稳断裂。室温和100℃时的KⅠH分别为58MPa/m3/2和61MPa/m3/2。
关键字: Ti-Al-Zr合金;氢致延迟断裂;力学性能
behavior of Ti-Al-Zr alloy
(1. School of Materials Science and Engineering,
Sichuang University, Chengdu 610065, China;
2. State Key Laboratory of Nuclear Flue and Materials,
Nuclear Power Institute of China, Chengdu 610041, China;
3. Chengdu Aerocraft Company, Chengdu 610091, China)
Abstract:Hydrogen induced delayed fracture behavior of a Ti-Al-Zr alloy containing 11%(mass fraction) hydrogen at room temperature and 100℃ was studied. The results show that the curves of crack propagation velocityvs stress intensity factor have typical two-stage characteristics. In the first stage, crack growth velocity(da/dt) does not increase significantly with stress intensity factor KⅠ. But in the second stage,(da/dt) increase rapidly with KⅠ increasing,and the specimen fractures when KⅠ extends to critical value KⅠH. KⅠH at room temperature and 100℃ is about 58MPa/m3/2 and 61MPa/m3/2 respectively.
Key words: Ti-Al-Zr alloy; hydrogen induced delayed fracture; mechanical property