Compressive strength and splitting tensile strength ofZr-based metallic glass

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• 作者：Hidefumi Date^a ; ^{date@tjcc.tohoku-gakuin.ac.jp"" rel=""nofollow} ; Minako Ishiguro^a ; Masatoshi Futakawa^b ; Takashi Naoe^b
• 关键词：Zr-based metallic glass ; Light emission ; Fraction of crystallization ; Heat treatment
• 刊名：Procedia Engineering
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：10
• 期：Complete
• 页码：857-862
• 全文大小：763 K

文摘

A Compressive test on Zr-based metallic glass was performed using a universal testing machine. The fracture process was recorded by high-speed video camera with a recording rate of 125,000 fps. The specimen was shear-fractured at 1.9 GPa accompanied by the strong light emission. The fracture surface consisted of the brittle and vain-patterned surfaces. In addition, another compressive test was carried out in argon gas. Since light emission was not observed, it was evident that the light emission was a result of the oxidization of hot particles. In order to identify the beginning of the fracture, a splitting tensile test was carried out. Light emission began at the centre of the cross-section of a cylindrical specimen, and the crack was propagated in a direction of about forty-five degrees from the horizontal. The fracture criterion of Zr-based bulk metallic glass is not determined by the principal stress. The effect of the fraction of crystallization in Zr-based bulk metallic glass on light emission was also investigated using a specimen heat-treated at several temperatures. The relation between the fraction of crystallization and light emission was confirmed by the experimental analysis.