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

Qing Zhou; Yin Du; Weichao Han; Yue Ren; Haimin Zhai; Haifeng Wang

doi:10.1016/j.scriptamat.2019.02.002

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

Qing Zhou, Yin Du, Weichao Han, Yue Ren, Haimin Zhai, Haifeng Wang

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

73 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	121-125
Number of pages	5
Journal	Scripta Materialia
Volume	164
DOIs	https://doi.org/10.1016/j.scriptamat.2019.02.002
State	Published - 15 Apr 2019

Keywords

Bulk metallic glass
High entropy
Strain rate sensitivity

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10.1016/j.scriptamat.2019.02.002

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abstract = "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.",

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author = "Qing Zhou and Yin Du and Weichao Han and Yue Ren and Haimin Zhai and Haifeng Wang",

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AU - Zhou, Qing

AU - Du, Yin

AU - Han, Weichao

AU - Ren, Yue

AU - Zhai, Haimin

AU - Wang, Haifeng

PY - 2019/4/15

Y1 - 2019/4/15

N2 - 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.

AB - 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.

KW - Bulk metallic glass

KW - High entropy

KW - Strain rate sensitivity

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M3 - 文章

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SN - 1359-6462

VL - 164

SP - 121

EP - 125

JO - Scripta Materialia

JF - Scripta Materialia

ER -

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

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