| TiNi形状记忆合金的氢致滞后断裂 |
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| 引用本文： | 何健英,高克玮,宿彦京,乔利杰,褚武扬.TiNi形状记忆合金的氢致滞后断裂[J].金属学报,2004,40(4):342-346. |
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| 作者姓名： | 何健英 高克玮 宿彦京 乔利杰 褚武扬 |
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| 作者单位： | 北京科技大学材料物理系,北京,100083 |
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| 基金项目： | 国家重点基础研究发展规划资助项目G19990650 |
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| 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。
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| 关 键 词： | TiNi 氢致滞后断裂 原子氢 氢化物 氢致马氏体 |
| 文章编号： | 0412-1961(2004)04-0342-05 |
| 收稿时间： | 2003-04-10 |
| 修稿时间： | 2003-06-25 |
HYDROGEN--INDUCED DELAYED FRACTURE IN TiNi |
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| HE Jianying,GAO Kewei,SU Yanjing,QIAO Lijie,CHU Wuyang.HYDROGEN--INDUCED DELAYED FRACTURE IN TiNi[J].Acta Metallurgica Sinica,2004,40(4):342-346. |
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| Authors: | HE Jianying GAO Kewei SU Yanjing QIAO Lijie CHU Wuyang |
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| Affiliation: | Department of Material Physics, University of Science and Technology Beijing, Beijing 100083 |
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| Abstract: | 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., KIH/KIC=2.01-0.25 LnCT. 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. |
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| Keywords: | TiNi shape memory alloy hydrogen-induced delayed fracture atomic hydrogen hydride hydrogen-induced martensite |
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