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Shear localization of nanoscale W in metallic glass composites

Published online by Cambridge University Press:  01 February 2006

Min Ha Lee  and
Daniel J. Sordelet
Min Ha Lee
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory, Iowa State University, Ames, Iowa 50011
Daniel J. Sordelet*
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory, Iowa State University, Ames, Iowa 50011
*
a)Address all correspondence to this author. e-mail: sordelet@ameslab.gov
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Abstract

High-density tungsten/metallic glass composites were fabricated by warm extrusion of two different powders. The first powder was a physical blend of −45 μm tungsten and Hf-based metallic glass powders and produced a relatively coarse distribution of tungsten particles within a continuous metallic glass matrix. The second powder was synthesized by mechanical milling the −45 μm tungsten and Hf-based metallic glass powders into composite particles composed of 20–500-nm layers of tungsten and metallic glass. The amorphous structure of the starting glass powders did not change during milling. Some macroscopic plasticity during compression testing was observed due to the formation of multiple shear bands at the interface between the coarse tungsten particles and the metallic glass matrix in the composite produced from blended powders. In contrast, shear localization without a decrease in strength occurred uniformly throughout the nano-grained tungsten and metallic glass phases in the sample obtained from extruded composite powders.

Keywords

CompositeGlassNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 2 , February 2006 , pp. 492 - 499
Copyright
Copyright © Materials Research Society 2006

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