On the atomic anisotropy of thermal expansion in bulk metallic glass

Qu, DD; Liss, KD; Yan, K; Reid, M; Almer, JD; Wang, Y; Liao, XZ; Shen, J

On the atomic anisotropy of thermal expansion in bulk metallic glass

Date

2011-09-01

Authors

Publisher

Wiley-Blackwell

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. © 2011, Wiley-Blackwell.

Keywords

Alloys, Thermal expansion, Metallic glasses, X-ray diffraction, Synchrotrons, Anisotropy

Citation

Qu, D.D., Liss, K.D., Yan, K., Reid, M., Almer, J.D., Wang, Y.B., Liao, X.Z., & Shen, J. (2011). On the atomic anisotropy of thermal expansion in bulk metallic glass. Advanced Engineering Materials, 13(9), 861-864. doi:10.1002/adem.201000349