Understanding the mechanism for the embrittlement of a monolithic Zr-based bulk metallic glass by oxygen

Z. H. Han; L. He; Y. L. Hou; J. Feng; J. Sun

doi:10.1016/j.intermet.2009.01.011

Understanding the mechanism for the embrittlement of a monolithic Zr-based bulk metallic glass by oxygen

Z. H. Han
, L. He
, Y. L. Hou
, J. Feng
, J. Sun

School of Materials Science and Engineering

Xi'an Jiaotong University

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

25 Scopus citations

Abstract

Monolithic bulk metallic glasses (BMGs) with a nominal composition of Zr₆₅Cu_27.5Al_7.5 and the oxygen concentrations of 0.06 at.% and 0.68 at.% were prepared respectively. Oxygen effects on the deformation behavior and as-cast structural state were investigated. Although no crystalline phases were found in the BMG with higher oxygen concentration, the compressive plasticity was dramatically decreased. It was found that there is no direct correlation between the notable embrittlement and the initial free-volume content in the BMG. Geometrically-constrained compression tests for the BMGs shown that the processes of free-volume accumulation and shear band propagation during plastic deformation were obviously retarded by oxygen. It appears that the mechanism for the oxygen-induced embrittlement was closely related with the decreased atomic mobility by oxygen. As an indicator of atomic mobility, activation energy may be used as a parameter to evaluate the plasticity of monolithic Zr-based BMGs with different dissolved oxygen concentrations.

Original language	English
Pages (from-to)	553-561
Number of pages	9
Journal	Intermetallics
Volume	17
Issue number	7
DOIs	https://doi.org/10.1016/j.intermet.2009.01.011
State	Published - Jul 2009

Keywords

B. Glasses, metallic
B. Mechanical properties at ambient temperature
B. Plastic deformation mechanisms
B. Thermodynamic and thermochemical properties
E. Defects: theory

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10.1016/j.intermet.2009.01.011

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title = "Understanding the mechanism for the embrittlement of a monolithic Zr-based bulk metallic glass by oxygen",

abstract = "Monolithic bulk metallic glasses (BMGs) with a nominal composition of Zr65Cu27.5Al7.5 and the oxygen concentrations of 0.06 at.\% and 0.68 at.\% were prepared respectively. Oxygen effects on the deformation behavior and as-cast structural state were investigated. Although no crystalline phases were found in the BMG with higher oxygen concentration, the compressive plasticity was dramatically decreased. It was found that there is no direct correlation between the notable embrittlement and the initial free-volume content in the BMG. Geometrically-constrained compression tests for the BMGs shown that the processes of free-volume accumulation and shear band propagation during plastic deformation were obviously retarded by oxygen. It appears that the mechanism for the oxygen-induced embrittlement was closely related with the decreased atomic mobility by oxygen. As an indicator of atomic mobility, activation energy may be used as a parameter to evaluate the plasticity of monolithic Zr-based BMGs with different dissolved oxygen concentrations.",

keywords = "B. Glasses, metallic, B. Mechanical properties at ambient temperature, B. Plastic deformation mechanisms, B. Thermodynamic and thermochemical properties, E. Defects: theory",

author = "Han, \{Z. H.\} and L. He and Hou, \{Y. L.\} and J. Feng and J. Sun",

year = "2009",

month = jul,

doi = "10.1016/j.intermet.2009.01.011",

language = "英语",

volume = "17",

pages = "553--561",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd",

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T1 - Understanding the mechanism for the embrittlement of a monolithic Zr-based bulk metallic glass by oxygen

AU - Han, Z. H.

AU - He, L.

AU - Hou, Y. L.

AU - Feng, J.

AU - Sun, J.

PY - 2009/7

Y1 - 2009/7

N2 - Monolithic bulk metallic glasses (BMGs) with a nominal composition of Zr65Cu27.5Al7.5 and the oxygen concentrations of 0.06 at.% and 0.68 at.% were prepared respectively. Oxygen effects on the deformation behavior and as-cast structural state were investigated. Although no crystalline phases were found in the BMG with higher oxygen concentration, the compressive plasticity was dramatically decreased. It was found that there is no direct correlation between the notable embrittlement and the initial free-volume content in the BMG. Geometrically-constrained compression tests for the BMGs shown that the processes of free-volume accumulation and shear band propagation during plastic deformation were obviously retarded by oxygen. It appears that the mechanism for the oxygen-induced embrittlement was closely related with the decreased atomic mobility by oxygen. As an indicator of atomic mobility, activation energy may be used as a parameter to evaluate the plasticity of monolithic Zr-based BMGs with different dissolved oxygen concentrations.

AB - Monolithic bulk metallic glasses (BMGs) with a nominal composition of Zr65Cu27.5Al7.5 and the oxygen concentrations of 0.06 at.% and 0.68 at.% were prepared respectively. Oxygen effects on the deformation behavior and as-cast structural state were investigated. Although no crystalline phases were found in the BMG with higher oxygen concentration, the compressive plasticity was dramatically decreased. It was found that there is no direct correlation between the notable embrittlement and the initial free-volume content in the BMG. Geometrically-constrained compression tests for the BMGs shown that the processes of free-volume accumulation and shear band propagation during plastic deformation were obviously retarded by oxygen. It appears that the mechanism for the oxygen-induced embrittlement was closely related with the decreased atomic mobility by oxygen. As an indicator of atomic mobility, activation energy may be used as a parameter to evaluate the plasticity of monolithic Zr-based BMGs with different dissolved oxygen concentrations.

KW - B. Glasses, metallic

KW - B. Mechanical properties at ambient temperature

KW - B. Plastic deformation mechanisms

KW - B. Thermodynamic and thermochemical properties

KW - E. Defects: theory

UR - https://www.scopus.com/pages/publications/63549148491

U2 - 10.1016/j.intermet.2009.01.011

DO - 10.1016/j.intermet.2009.01.011

M3 - 文章

AN - SCOPUS:63549148491

SN - 0966-9795

VL - 17

SP - 553

EP - 561

JO - Intermetallics

JF - Intermetallics

IS - 7

ER -

Understanding the mechanism for the embrittlement of a monolithic Zr-based bulk metallic glass by oxygen

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Keywords

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