Laboratory of Environmental Fracture; Corrosion and Protection Center; University of Science and Technology Beijing; Beijing 100083
Cite this article:
SHAN Guangbin; WEI Bingchen; LI Jinxu; QIAO Lijie; CHU Wuyang. Effects of Hydrogen on Shear Bands and Cracking in Zr Base Bulk Amorphous Alloy. Acta Metall Sin, 2006, 42(7): 689-693 .
Abstract The effect of hydrogen on shear bands and cracking in bulk metallic glass of Zr65Al7.5Ni10Cu17.5 has been studied through in situ tensile and banding tests in SEM using a single-edge notched and smooth three-point samples. The results show that for either hydrogen-free or hydrogenated samples, shear crack will initiate and propagate along shear bands when shear bands grow a certain condition, and opening of shear crack under a tensile stress results in rapid fracture of samples. The characterless zone on the fracture is the shear band instead of fracture surface of shear crack. There is no essential difference between tensile and shear fracture surfaces. Hydrogen blistering will form after charging for a long time, if hydrogen blistering is very small or unformed, there is no evident effect of hydrogen on forming of shear bands and initiating of crack. If the hydrogen blistering is large, the shear crack will initiate at the early stage of growing shear band, resulting in brittle fracture under low stress.
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