Effect of Hydride and Hydrogen—Induced Martensite on Fracture Toughness of TiNi Alloy

Acta Metall Sin

2004, Vol. 40

Issue (3): 291-295 DOI:

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Effect of Hydride and Hydrogen—Induced Martensite on Fracture Toughness of TiNi Alloy

HE Jianying; GAO Kewei; QIAO Lijie; CHU Wuyang

Department of Materials Physics; University of Science and Technology Beijing

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HE Jianying; GAO Kewei; QIAO Lijie; CHU Wuyang. Effect of Hydride and Hydrogen—Induced Martensite on Fracture Toughness of TiNi Alloy. Acta Metall Sin, 2004, 40(3): 291-295 .

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Abstract The hydride formed in hydrogen charging TiNi shape memory alloy could decrease evidently fracture toughness K IC of the TiNi alloy and the relative loss of K IC is as high as 96%. The relative loss of K IC induced by the hydrogen induced martensite, however, is only about 1.8%, and does not change evidently with hydrogen concentration. Therefore, the decrease in fracture toughness of hydrogenated specimen is almost completely attributed to hydride. The relative loss of induced by hydrides, increases with increasing hydride content. Microcracks could be generated along the hydrides during charging at i>15 mA/cm2 and do not cause farther the decrease in K IC .

Key words: TiNi hydrogen hydride

Received: 11 March 2003

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