The role of hydride, martensite and atomic hydrogen in hydrogen-induced delayed fracture of TiNi alloy

被引：13
作者：
He, JY [1 ]
Gao, KW [1 ]
Su, YJ [1 ]
Qiao, LJ [1 ]
Chu, WY [1 ]
机构：
[1] Univ Sci & Technol Beijing, Dept Mat Phys, Beijing 100083, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 364卷 / 1-2期
关键词：
TiNi shape memory alloy; hydrogen-induced delayed fracture; atomic hydrogen; hydrogen-induced martensite; hydride;
D O I：
10.1016/j.msea.2003.08.062
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The role of atomic hydrogen, hydrogen-induced martensite and hydride in hydrogen-induced delayed fracture of a TiNi shape memory alloy during charging under a sustained load has been investigated using a notched tensile specimen. The results show that hydrogen-induced delayed fracture of the TiNi alloy can occur, and the normalized threshold stress intensity factor, KIHIKIC decrease linearly with the logarithm of the total hydrogen concentration C-T, i.e., KIHIKIC = 2.01 - 0.25 In CT. The content of the hydrides increase gradually, and then the intrinsic fracture toughness of the hydrogenated specimen decrease sharply during dynamic charging. The formation of hydrides is the main reason of hydrogen-induced delayed fracture of the TiNi alloy. The role of atomic hydrogen and hydrogen-induced martensite in hydrogen-induced delayed fracture is very small. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：333 / 338
页数：6
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