Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (6): 726-732.DOI: 10.1007/s40195-018-0860-z

• Orginal Article • Previous Articles     Next Articles

Mechanical Relaxation of a Ti36.2Zr30.3Cu8.3Fe4Be21.2 Bulk Metallic Glass: Experiments and Theoretical Analysis

Qiao J.C.1(), Chen Y.H.1, Lyu G.J.1, Song K.K.2, Pelletier J.M.3, Yao Y.1()   

  1. 1 School of Mechanics, Civil Engineering and Architecture,Northwestern Polytechnical University, Xi’an 710072, China;
    2 School of Mechanical, Electrical and Information Engineering, Shandong University (Weihai), Weihai 264209,China
    3 MATEIS, UMR CNRS5510, Bat. B. Pascal, INSA-Lyon,Université de Lyon, 69621 Villeurbanne Cedex, France;;
  • Received:2018-09-17 Revised:2018-10-25 Online:2019-06-10 Published:2019-06-17
  • Supported by:
    The research was supported by the National Natural Science Foundation of China (Nos. 51611130120, 11772257, 11572249, 51871132). J.C. Qiao is also supported by the Fundamental Research Funds for the Central Universities (Nos. 3102018ZY010, 3102017HQZZ012).

Abstract:

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 χ. The physical aging below the glass transition temperature Tg shows a non-Debye relaxation behavior, which could be well described by stretched Kohlrausch exponential equation. The Kohlrausch exponent \(\beta_{\text{aging}}\) 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.

Key words: Metallic, glasses, Mechanical, relaxation, Physical, aging, Quasi-point, defects