On the atomic anisotropy of thermal expansion in bulk metallic glass

Authors

Dongdong Qu, Harbin Institute of Technology, Harbin, China
Klaus-Dieter Liss, ANSTOFollow
Kun Yan
Mark H. Reid, University of WollongongFollow
Jonathan D. Almer, Argonne National Laboratory
Yanbo Wang, University of Sydney
Xiaozhou Liao, University of Sydney
Jun Shen, University of WollongongFollow

RIS ID

38475

Publication Details

Qu, D., Liss, K., Yan, K., Reid, M., Almer, J. D., Wang, Y., Liao, X. Shen, J. (2011). On the atomic anisotropy of thermal expansion in bulk metallic glass. Advanced Engineering Materials, 13 (9), 861-864.

Abstract

Glass transition temperature and plastic yield strength are known to be correlated in metallic glasses. We have observed by in situ synchrotron high energy X-ray diffraction anisotropy of the thermal expansion behavior in the nearest neighbor and second nearest neighbor atomic distances in the building blocks of Zr-Cu-Ni-Al based bulk metallic glass, leading inevitably to shear. Mechanical yielding of the latter on the atomic scale leads to the glass transition and the increase of the free volume. These experimental results uncover the mechanism, how glass transition and yield strength are linked.