标题：Mechanical Relaxation of a Ti36.2Zr30.3Cu8.3Fe4Be21.2 Bulk Metallic Glass: Experiments and Theoretical Analysis
作者：Qiao, J. C.; Chen, Y. H.; Lyu, G. J.; Song, K. K.; Pelletier, J. M.; Yao, Y.
作者机构：[Qiao, J. C.; Chen, Y. H.; Lyu, G. J.; Yao, Y.] Northwestern Polytech Univ, Sch Mech, Civil Engn & Architecture, Xian 710072, Shaanxi, Peoples R China 更多
通讯作者：Qiao, JC;Yao, Y;Qiao, JC
通讯作者地址：[Qiao, JC; Yao, Y]Northwestern Polytech Univ, Sch Mech, Civil Engn & Architecture, Xian 710072, Shaanxi, Peoples R China.
来源：ACTA METALLURGICA SINICA-ENGLISH LETTERS
关键词：Metallic glasses; Mechanical relaxation; Physical aging; Quasi-point; defects
摘要：The dynamic mechanical relaxation behavior of Ti36.2Zr30.3Cu8.3Fe4Be21.2 bulk metallic glass with good glass-forming ability was investigated by mechanical spectroscopy. The mechanical relaxation behavior was analyzed in the framework of quasi-point defects model. The experimental results demonstrate that the atomic mobility of the metallic glass is closely associated with the correlation factor . The physical aging below the glass transition temperature T-g shows a non-Debye relaxation behavior, which could be well described by stretched Kohlrausch exponential equation. The Kohlrausch exponent aging reflects the dynamic heterogeneities of the metallic glass. Both concentration of defects and atomic mobility decrease caused by the in situ successive heating during the mechanical spectroscopy experiments.