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On the Atomic Anisotropy of Thermal Expansion in Bulk Metallic Glass
Author(s) -
Qu Dongdong,
Liss KlausDieter,
Yan Kun,
Reid Mark,
Almer Jonathan D.,
Wang Yanbo,
Liao Xiaozhou,
Shen Jun
Publication year - 2011
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201000349
Subject(s) - materials science , anisotropy , thermal expansion , amorphous metal , glass transition , yield (engineering) , diffraction , k nearest neighbors algorithm , transition metal , condensed matter physics , thermal , composite material , thermodynamics , optics , biochemistry , catalysis , physics , chemistry , alloy , polymer , artificial intelligence , computer science
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 ZrCuNiAl 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.