Hydrogen-induced delayed fracture in TiNi shape memory alloy

被引：0
作者：
He, JY [1 ]
Gao, KW [1 ]
Su, YJ [1 ]
Qiao, L [1 ]
Chu, WY [1 ]
机构：
[1] Univ Sci & Technol Beijing, Dept Mat Phys, Beijing 100083, Peoples R China
来源：
ACTA METALLURGICA SINICA | 2004年 / 40卷 / 04期
关键词：
TiNi shape memory alloy; hydrogen induced delayed fracture; atomic hydrogen; hydride; hydrogen-induced martensite;
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Hydrogen-induced delayed fracture during dynamic charging of TiNi shape memory alloy, and the role of atomic hydrogen, hydrogen-induced martensite and hydride in hydrogen-induced delayed fracture have been investigated. The results show that hydrogen-induced delayed fracture in TiNi alloy could occur, and the normalized threshold stress intensity factor decreased linearly with increasing the total hydrogen concentration, i.e., K-IH/K-IC=2.01-0.25 InC.T. The content of hydride increased continuously during dynamic charging, and the fracture toughness of the TiNi alloy decreased gradually, which is the main cause of hydrogen-induced delayed fracture. The role of atomic hydrogen and hydrogen-induced martensite in hydrogen-induced delayed fracture was very small.
引用
收藏
页码：342 / 346
页数：5
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