Mechanical behaviours of workhardening and worksoftening bulk metallic glasses

W. H. Jiang; F. Jiang; F. X. Liu; Y. D. Wang; H. M. Dang; F. Q. Yang; H. Choo; P. k. Liaw

doi:10.1179/1743284711Y.0000000011

Mechanical behaviours of workhardening and worksoftening bulk metallic glasses

W. H. Jiang, F. Jiang, F. X. Liu, Y. D. Wang, H. M. Dang, F. Q. Yang, H. Choo, P. k. Liaw

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

4 Scopus citations

Abstract

The workhardening Cu _47.5Zr4 _7.5Al5 and the worksoftening Zr _52.5Cu _17.9Ni _14.6Al _10.0Ti _5.0 bulk metallic glasses before and after precompression deformation were characterised for thermal and mechanical behaviours. The predeformation introduces excessive free volume in both glasses. Cu4 _7.5Zr _47.5Al ₅ and Zr _52.5Cu _17.9Ni _14.6Al _10.0Ti _5.0 exhibit substantial workhardening and worksoftening behaviours respectively. For Cu _47.5Zr _47.5Al ₅, the precompression has a negligible effect on serrations in the plastic flow during nanoindentation, which is related to the hardening of a shear band, while for Zr _52.5Cu _17.9Ni _14.6Al _10.0Ti _5.0, the precompression moderates serrations in the plastic flow during nanoindentation, which is associated with the softening of a shear band. Strengthening from mechanically induced nanocrystallites at shear bands is responsible for the workhardening of Cu _47.5Zr _47.5Al ₅, which overwhelms softening due to the introduction of excessive free volume.

Original language	English
Pages (from-to)	249-255
Number of pages	7
Journal	Materials Science and Technology (United Kingdom)
Volume	28
Issue number	2
DOIs	https://doi.org/10.1179/1743284711Y.0000000011
State	Published - 2012

Keywords

Bulk metallic glass
Mechanical property
Nanoindentation
Shear band
Workhardening

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1179/1743284711Y.0000000011

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title = "Mechanical behaviours of workhardening and worksoftening bulk metallic glasses",

abstract = "The workhardening Cu 47.5Zr4 7.5Al5 and the worksoftening Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0 bulk metallic glasses before and after precompression deformation were characterised for thermal and mechanical behaviours. The predeformation introduces excessive free volume in both glasses. Cu4 7.5Zr 47.5Al 5 and Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0 exhibit substantial workhardening and worksoftening behaviours respectively. For Cu 47.5Zr 47.5Al 5, the precompression has a negligible effect on serrations in the plastic flow during nanoindentation, which is related to the hardening of a shear band, while for Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0, the precompression moderates serrations in the plastic flow during nanoindentation, which is associated with the softening of a shear band. Strengthening from mechanically induced nanocrystallites at shear bands is responsible for the workhardening of Cu 47.5Zr 47.5Al 5, which overwhelms softening due to the introduction of excessive free volume.",

keywords = "Bulk metallic glass, Mechanical property, Nanoindentation, Shear band, Workhardening",

author = "Jiang, {W. H.} and F. Jiang and Liu, {F. X.} and Wang, {Y. D.} and Dang, {H. M.} and Yang, {F. Q.} and H. Choo and Liaw, {P. k.}",

year = "2012",

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language = "English",

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pages = "249--255",

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T1 - Mechanical behaviours of workhardening and worksoftening bulk metallic glasses

AU - Jiang, W. H.

AU - Jiang, F.

AU - Liu, F. X.

AU - Wang, Y. D.

AU - Dang, H. M.

AU - Yang, F. Q.

AU - Choo, H.

AU - Liaw, P. k.

PY - 2012

Y1 - 2012

N2 - The workhardening Cu 47.5Zr4 7.5Al5 and the worksoftening Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0 bulk metallic glasses before and after precompression deformation were characterised for thermal and mechanical behaviours. The predeformation introduces excessive free volume in both glasses. Cu4 7.5Zr 47.5Al 5 and Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0 exhibit substantial workhardening and worksoftening behaviours respectively. For Cu 47.5Zr 47.5Al 5, the precompression has a negligible effect on serrations in the plastic flow during nanoindentation, which is related to the hardening of a shear band, while for Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0, the precompression moderates serrations in the plastic flow during nanoindentation, which is associated with the softening of a shear band. Strengthening from mechanically induced nanocrystallites at shear bands is responsible for the workhardening of Cu 47.5Zr 47.5Al 5, which overwhelms softening due to the introduction of excessive free volume.

AB - The workhardening Cu 47.5Zr4 7.5Al5 and the worksoftening Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0 bulk metallic glasses before and after precompression deformation were characterised for thermal and mechanical behaviours. The predeformation introduces excessive free volume in both glasses. Cu4 7.5Zr 47.5Al 5 and Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0 exhibit substantial workhardening and worksoftening behaviours respectively. For Cu 47.5Zr 47.5Al 5, the precompression has a negligible effect on serrations in the plastic flow during nanoindentation, which is related to the hardening of a shear band, while for Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0, the precompression moderates serrations in the plastic flow during nanoindentation, which is associated with the softening of a shear band. Strengthening from mechanically induced nanocrystallites at shear bands is responsible for the workhardening of Cu 47.5Zr 47.5Al 5, which overwhelms softening due to the introduction of excessive free volume.

KW - Bulk metallic glass

KW - Mechanical property

KW - Nanoindentation

KW - Shear band

KW - Workhardening

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Mechanical behaviours of workhardening and worksoftening bulk metallic glasses

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