Bulk metallic glasses with large plasticity: Composition design from the structural perspective

Li Zhang; Yong Qiang Cheng; A. Jing Cao; Jian Xu; Evan Ma

doi:10.1016/j.actamat.2008.11.002

Bulk metallic glasses with large plasticity: Composition design from the structural perspective

Li Zhang, Yong Qiang Cheng, A. Jing Cao, Jian Xu, Evan Ma

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

120 Scopus citations

Abstract

While most bulk metallic glasses (BMGs) appear brittle at room temperature, appreciable compressive plastic strains have been observed for some glass compositions. The origin of this behavior is not understood, and the compositions of such plastic BMGs remain difficult to predict. Here we explain the plasticity observed in a Zr-Cu(Ni)-Al BMG, based on a computational analysis of the composition-dependent internal structures that influence shear transformations and shear localization behavior under loading. A strategy is then proposed to design BMG compositions with the desired local order for significant compressive plasticity, and is demonstrated by the successful discovery of an Hf₆₂Ni₂₅Al₁₃ BMG capable of sustaining large compressive strains. The experimentally measured compressive strength, glass transition temperature and Poisson's ratio, which are all composition dependent, are also shown to be macroscopic indicators that correlate well with the predictions from the atomic level structure.

Original language	English
Pages (from-to)	1154-1164
Number of pages	11
Journal	Acta Materialia
Volume	57
Issue number	4
DOIs	https://doi.org/10.1016/j.actamat.2008.11.002
State	Published - Feb 2009
Externally published	Yes

Funding

The authors thank Prof. H.W. Sheng for the EAM potentials he developed while he was at The Johns Hopkins University. The authors gratefully acknowledge stimulating discussion with Prof. Y. Li and Prof. T.G. Nieh. This work is supported at SYNL by National Basic Research Program of China (973 Program) under Contract No. 2007CB613906, and at The Johns Hopkins University by the US Department of Energy, BES-DMSE, under Contract No. DE-FG02-03ER46056.

Funders	Funder number
BES-DMSE
US Department of Energy
Johns Hopkins University
National Basic Research Program of China (973 Program)	2007CB613906

Keywords

Amorphous materials
Mechanical properties
Metallic glasses
Plastic deformation
Structure

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10.1016/j.actamat.2008.11.002

Cite this

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title = "Bulk metallic glasses with large plasticity: Composition design from the structural perspective",

abstract = "While most bulk metallic glasses (BMGs) appear brittle at room temperature, appreciable compressive plastic strains have been observed for some glass compositions. The origin of this behavior is not understood, and the compositions of such plastic BMGs remain difficult to predict. Here we explain the plasticity observed in a Zr-Cu(Ni)-Al BMG, based on a computational analysis of the composition-dependent internal structures that influence shear transformations and shear localization behavior under loading. A strategy is then proposed to design BMG compositions with the desired local order for significant compressive plasticity, and is demonstrated by the successful discovery of an Hf62Ni25Al13 BMG capable of sustaining large compressive strains. The experimentally measured compressive strength, glass transition temperature and Poisson's ratio, which are all composition dependent, are also shown to be macroscopic indicators that correlate well with the predictions from the atomic level structure.",

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AU - Zhang, Li

AU - Cheng, Yong Qiang

AU - Cao, A. Jing

AU - Xu, Jian

AU - Ma, Evan

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AB - While most bulk metallic glasses (BMGs) appear brittle at room temperature, appreciable compressive plastic strains have been observed for some glass compositions. The origin of this behavior is not understood, and the compositions of such plastic BMGs remain difficult to predict. Here we explain the plasticity observed in a Zr-Cu(Ni)-Al BMG, based on a computational analysis of the composition-dependent internal structures that influence shear transformations and shear localization behavior under loading. A strategy is then proposed to design BMG compositions with the desired local order for significant compressive plasticity, and is demonstrated by the successful discovery of an Hf62Ni25Al13 BMG capable of sustaining large compressive strains. The experimentally measured compressive strength, glass transition temperature and Poisson's ratio, which are all composition dependent, are also shown to be macroscopic indicators that correlate well with the predictions from the atomic level structure.

KW - Amorphous materials

KW - Mechanical properties

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KW - Plastic deformation

KW - Structure

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Bulk metallic glasses with large plasticity: Composition design from the structural perspective

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Keywords

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