Pair distribution function study and mechanical behavior of as-cast and structurally relaxed Zr-based bulk metallic glasses

Cang Fan; P. K. Liaw; T. W. Wilson; H. Choo; Y. F. Gao; C. T. Liu; Th Proffen; J. W. Richardson

doi:10.1063/1.2402884

Pair distribution function study and mechanical behavior of as-cast and structurally relaxed Zr-based bulk metallic glasses

Cang Fan, P. K. Liaw, T. W. Wilson, H. Choo, Y. F. Gao, C. T. Liu, Th Proffen, J. W. Richardson

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

17 Scopus citations

Abstract

Contrary to reported results on structural relaxation inducing brittleness in amorphous alloys, the authors found that structural relaxation actually caused an increase in the strength of Zr55 Cu35 Al10 bulk metallic glass (BMG) without changing the plasticity. Three dimensional models were rebuilt for the as-cast and structurally relaxed BMGs by reverse Monte Carlo (RMC) simulations based on the pair distribution function (PDF) measured by neutron scattering. Only a small portion of the atom pairs was found to change to more dense packing. The concept of free volume was defined based on the PDF and RMC studies, and the mechanism of mechanical behavior was discussed.

Original language	English
Article number	231920
Journal	Applied Physics Letters
Volume	89
Issue number	23
DOIs	https://doi.org/10.1063/1.2402884
State	Published - 2006
Externally published	Yes

Funding

This work was supported by the International Materials Institutes Program (DMR-0231320), and benefited from the use of GPPD at Argonne National Laboratory (W-31-1090Eng-38). One of the authors (C.F.) acknowledges T. Egami, S. J. L. Billinge, T. Hufnagel, E. Ma, and E. R. Maxey. Two of the authors (C.T.L. and Y.F.G.) are supported by the Division of Materials Science and Engineering, Office of Basic Energy Sciences, US Department of Energy (DE-AC05-00OR-22725) with UT-Battelle, LLC.

Funders	Funder number
International Materials Institutes Program	DMR-0231320
U.S. Department of Energy	DE-AC05-00OR-22725
Basic Energy Sciences
Argonne National Laboratory	W-31-1090Eng-38
Division of Materials Sciences and Engineering

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abstract = "Contrary to reported results on structural relaxation inducing brittleness in amorphous alloys, the authors found that structural relaxation actually caused an increase in the strength of Zr55 Cu35 Al10 bulk metallic glass (BMG) without changing the plasticity. Three dimensional models were rebuilt for the as-cast and structurally relaxed BMGs by reverse Monte Carlo (RMC) simulations based on the pair distribution function (PDF) measured by neutron scattering. Only a small portion of the atom pairs was found to change to more dense packing. The concept of free volume was defined based on the PDF and RMC studies, and the mechanism of mechanical behavior was discussed.",

author = "Cang Fan and Liaw, {P. K.} and Wilson, {T. W.} and H. Choo and Gao, {Y. F.} and Liu, {C. T.} and Th Proffen and Richardson, {J. W.}",

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journal = "Applied Physics Letters",

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AU - Fan, Cang

AU - Liaw, P. K.

AU - Wilson, T. W.

AU - Choo, H.

AU - Gao, Y. F.

AU - Liu, C. T.

AU - Proffen, Th

AU - Richardson, J. W.

PY - 2006

Y1 - 2006

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AB - Contrary to reported results on structural relaxation inducing brittleness in amorphous alloys, the authors found that structural relaxation actually caused an increase in the strength of Zr55 Cu35 Al10 bulk metallic glass (BMG) without changing the plasticity. Three dimensional models were rebuilt for the as-cast and structurally relaxed BMGs by reverse Monte Carlo (RMC) simulations based on the pair distribution function (PDF) measured by neutron scattering. Only a small portion of the atom pairs was found to change to more dense packing. The concept of free volume was defined based on the PDF and RMC studies, and the mechanism of mechanical behavior was discussed.

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 23

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ER -

Pair distribution function study and mechanical behavior of as-cast and structurally relaxed Zr-based bulk metallic glasses

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