Identifying the origin of strain rate sensitivity in a high entropy bulk metallic glass

A series of nanoindentation tests were performed on a high entropy bulk metallic glass (HE-BMG). At low peak-loads, high positive strain rate sensitivity was found. But increasing the peak-load, the sensitivity of hardness to strain rate decreased dramatically. At low peak-loads, sluggish diffusion...

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Bibliographic Details
Published in:	Scripta materialia Vol. 164; pp. 121 - 125
Main Authors:	Zhou, Qing, Du, Yin, Han, Weichao, Ren, Yue, Zhai, Haimin, Wang, Haifeng
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 15-04-2019
Subjects:	Bulk metallic glass High entropy Strain rate sensitivity Strain rate sensitivity High entropy Bulk metallic glass
Online Access:	Get full text
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Summary:	A series of nanoindentation tests were performed on a high entropy bulk metallic glass (HE-BMG). At low peak-loads, high positive strain rate sensitivity was found. But increasing the peak-load, the sensitivity of hardness to strain rate decreased dramatically. At low peak-loads, sluggish diffusion in HE-BMG significantly impedes atomic arrangement in the shear yielding events, whereas at high peak-loads, the shear-band deformation is dominated by the shear front triggered events. The work showed the origin of strain rate sensitivity in HE-BMGs and might help for tailoring the mechanical properties. [Display omitted]
ISSN:	1359-6462 1872-8456
DOI:	10.1016/j.scriptamat.2019.02.002