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Deformation and crystallization of Zr-based amorphous alloys in homogeneous flow regime

Published online by Cambridge University Press:  31 January 2011

Min Tao*
Affiliation:
Intel Corporation, Chandler, Arizona 85226
Atul H. Chokshi
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore 560012, India
Robert D. Conner
Affiliation:
Department of Manufacturing Systems Engineering and Management, California State University–Northridge, Northridge, California 91330
Guruswami Ravichandran
Affiliation:
Graduate Aerospace Laboratories, California Institute of Technology, Pasadena, California 91125
William L. Johnson
Affiliation:
Keck Laboratories of Material Science, California Institute of Technology, Pasadena, California 91125
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The purpose of this study is to experimentally investigate the interaction of inelastic deformation and microstructural changes of two Zr-based bulk metallic glasses (BMGs): Zr41.25Ti13.75Cu12.5Ni10Be22.5 (commercially designated as Vitreloy 1 or Vit1) and Zr46.75Ti8.25Cu7.5Ni10Be27.5 (Vitreloy 4, Vit4). High-temperature uniaxial compression tests were performed on the two Zr alloys at various strain rates, followed by structural characterization using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two distinct modes of mechanically induced atomic disordering in the two alloys were observed, with Vit1 featuring clear phase separation and crystallization after deformation as observed with TEM, while Vit4 showing only structural relaxation with no crystallization. The influence of the structural changes on the mechanical behaviors of the two materials was further investigated by jump-in-strain-rate tests, and flow softening was observed in Vit4. A free volume theory was applied to explain the deformation behaviors, and the activation volumes were calculated for both alloys.

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Articles
Copyright
Copyright © Materials Research Society 2010

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References

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