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HYDROGEN--INDUCED DELAYED FRACTURE IN TiNi |
HE Jianying; GAO Kewei; SU Yanjing; QIAO Lijie; CHU Wuyang |
Department of Material Physics; University of Science and Technology Beijing; Beijing 100083 |
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Cite this article:
HE Jianying; GAO Kewei; SU Yanjing; QIAO Lijie; CHU Wuyang. HYDROGEN--INDUCED DELAYED FRACTURE IN TiNi. Acta Metall Sin, 2004, 40(4): 342-346 .
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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=2.01-0.25lnCT.
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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Received: 10 April 2003
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