摘要
用单边缺口拉伸试样研究了TiNi形状记忆合金在恒载荷下动态充氢时的滞后断裂过程,以及原子氢、氢致马氏体和氢化物在氢致滞后断裂中所起的作用.结果表明,TiNi合金能发生氢致滞后断裂,归一化门槛应力强度因子随总氢浓度对数的增加而线性下降,即KIH/KIC=2.01-0.25lnCT.在恒载荷动态充氢时氢化物含量不断升高,材料的断裂韧性不断下降,这是氢致滞后断裂的主要原因;而原子氢和氢致马氏体在氢致滞后断裂中所起的作用则极小.
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.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第4期342-346,共5页
Acta Metallurgica Sinica
基金
国家重点基础研究发展规划资助项目G19990650
关键词
TINI
氢致滞后断裂
原子氢
氢化物
氢致马氏体
TiNi shape memory alloy
hydrogen induced delayed fracture
atomic hydrogen
hydride
hydrogen-induced martensite
