J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (6): 982-986.DOI: 10.1016/j.jmst.2018.12.003

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Main α relaxation and slow β relaxation processes in a La30Ce30Al15Co25 metallic glass

J.C. Qiaoa*(), Y.H. Chena, R. Casalinib, J.M. Pelletierc, Y. Yaoa*()   

  1. a School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, China
    b Chemistry Division, Naval Research Laboratory, Code 6120, Washington DC 20375-5342, United States
    c Université de Lyon, MATEIS, UMR CNRS5510, Bat. B. Pascal, INSA-Lyon, F-69621 Villeurbanne cedex, France
  • Received:2018-07-25 Revised:2018-08-14 Accepted:2018-08-15 Online:2019-06-20 Published:2019-06-19
  • Contact: Qiao J.C.,Yao Y.
  • About author:

    1The authors contributed equally to this work.

Abstract:

Dynamic relaxation processes are fundamental to understand the mechanical and physical properties of metallic glasses. In the current work, mechanical relaxations in a La30Ce30Al15Co25 bulk metallic glass were probed by dynamic mechanical analysis. In contrast to many metallic glasses, La30Ce30Al15Co25 metallic glass shows a pronounced slow β relaxation peak. Physical aging below the glass transition temperature Tg leads to an increase of the apparent activation energy and a decrease of the slow β relaxation magnitude. The correlation between the slow β relaxation and the main α relaxation is discussed.

Key words: Mechanical relaxation, Dynamic mechanical relaxation, α Relaxation, β relaxation, Physical aging