High strain rate sensitivity of hardness in Ti-Zr-Hf-Be-(Cu/Ni) high entropy bulk metallic glasses

Shaofan Zhao; Haibin Wang; Jialun Gu; Nan Guo; Ling Shao; Yingqi Zhang; Kefu Yao; Na Chen

doi:10.1016/j.jallcom.2018.01.264

High strain rate sensitivity of hardness in Ti-Zr-Hf-Be-(Cu/Ni) high entropy bulk metallic glasses

Shaofan Zhao
, Haibin Wang
, Jialun Gu
, Nan Guo
, Ling Shao
, Yingqi Zhang
, Kefu Yao
, Na Chen

Qian Xuesen Laboratory of Space Technology
Beijing University of Technology
Tsinghua University
Beihang University
Key Lab of the Ministry of Education for Process Control and Efficiency Egineering

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

24 Scopus citations

Abstract

Nanoindentation tests on the Ti₂₀Zr₂₀Hf₂₀Be₂₀(Cu_20-xNi_x) (x = 0, 12.5, 20 at.%) high entropy bulk metallic glasses (HE-BMGs) indicate both their average hardness and moduli show a significant loading strain rate-dependent behaviour. In special, the strain rate sensitivity of hardness measured for the prepared TiZrHfBeNi HE-BMG is up to 0.056 which is the highest value reported for BMGs so far. Such high strain rate sensitivity of hardness is likely due to the high-entropy effect, which makes the amorphous structure more homogeneous. In addition, the high entropy coupled with amorphous structure manifests as small shear transformation zone (STZ) volumes that could make the shear bands hard to be initiated.

Original language	English
Pages (from-to)	312-317
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	742
DOIs	https://doi.org/10.1016/j.jallcom.2018.01.264
State	Published - 25 Apr 2018
Externally published	Yes

Keywords

High entropy bulk metallic glasses
Nanoindentation
Strain rate sensitivity

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10.1016/j.jallcom.2018.01.264

Cite this

@article{d2290b42f8144643b698fe311bea02ce,

title = "High strain rate sensitivity of hardness in Ti-Zr-Hf-Be-(Cu/Ni) high entropy bulk metallic glasses",

abstract = "Nanoindentation tests on the Ti20Zr20Hf20Be20(Cu20-xNix) (x = 0, 12.5, 20 at.\%) high entropy bulk metallic glasses (HE-BMGs) indicate both their average hardness and moduli show a significant loading strain rate-dependent behaviour. In special, the strain rate sensitivity of hardness measured for the prepared TiZrHfBeNi HE-BMG is up to 0.056 which is the highest value reported for BMGs so far. Such high strain rate sensitivity of hardness is likely due to the high-entropy effect, which makes the amorphous structure more homogeneous. In addition, the high entropy coupled with amorphous structure manifests as small shear transformation zone (STZ) volumes that could make the shear bands hard to be initiated.",

keywords = "High entropy bulk metallic glasses, Nanoindentation, Strain rate sensitivity",

author = "Shaofan Zhao and Haibin Wang and Jialun Gu and Nan Guo and Ling Shao and Yingqi Zhang and Kefu Yao and Na Chen",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = apr,

day = "25",

doi = "10.1016/j.jallcom.2018.01.264",

language = "英语",

volume = "742",

pages = "312--317",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - High strain rate sensitivity of hardness in Ti-Zr-Hf-Be-(Cu/Ni) high entropy bulk metallic glasses

AU - Zhao, Shaofan

AU - Wang, Haibin

AU - Gu, Jialun

AU - Guo, Nan

AU - Shao, Ling

AU - Zhang, Yingqi

AU - Yao, Kefu

AU - Chen, Na

PY - 2018/4/25

Y1 - 2018/4/25

N2 - Nanoindentation tests on the Ti20Zr20Hf20Be20(Cu20-xNix) (x = 0, 12.5, 20 at.%) high entropy bulk metallic glasses (HE-BMGs) indicate both their average hardness and moduli show a significant loading strain rate-dependent behaviour. In special, the strain rate sensitivity of hardness measured for the prepared TiZrHfBeNi HE-BMG is up to 0.056 which is the highest value reported for BMGs so far. Such high strain rate sensitivity of hardness is likely due to the high-entropy effect, which makes the amorphous structure more homogeneous. In addition, the high entropy coupled with amorphous structure manifests as small shear transformation zone (STZ) volumes that could make the shear bands hard to be initiated.

AB - Nanoindentation tests on the Ti20Zr20Hf20Be20(Cu20-xNix) (x = 0, 12.5, 20 at.%) high entropy bulk metallic glasses (HE-BMGs) indicate both their average hardness and moduli show a significant loading strain rate-dependent behaviour. In special, the strain rate sensitivity of hardness measured for the prepared TiZrHfBeNi HE-BMG is up to 0.056 which is the highest value reported for BMGs so far. Such high strain rate sensitivity of hardness is likely due to the high-entropy effect, which makes the amorphous structure more homogeneous. In addition, the high entropy coupled with amorphous structure manifests as small shear transformation zone (STZ) volumes that could make the shear bands hard to be initiated.

KW - High entropy bulk metallic glasses

KW - Nanoindentation

KW - Strain rate sensitivity

UR - https://www.scopus.com/pages/publications/85041665271

U2 - 10.1016/j.jallcom.2018.01.264

DO - 10.1016/j.jallcom.2018.01.264

M3 - 文章

AN - SCOPUS:85041665271

SN - 0925-8388

VL - 742

SP - 312

EP - 317

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

High strain rate sensitivity of hardness in Ti-Zr-Hf-Be-(Cu/Ni) high entropy bulk metallic glasses

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Keywords

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