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Microstructures and properties of the tungsten wire/particle reinforced Zr57Nb5Al10Cu15.4Ni12.6 metallic glass composites

Published online by Cambridge University Press:  11 February 2011

Haein Choi-Yim ,
Jan Schroers  and
William L. Johnson
Haein Choi-Yim
Affiliation:
W.M. Keck Laboratory of Engineering Materials, Mail Code 138–78, California Institute of Technology, Pasadena, California 91125, USA
Jan Schroers
Affiliation:
W.M. Keck Laboratory of Engineering Materials, Mail Code 138–78, California Institute of Technology, Pasadena, California 91125, USA
William L. Johnson
Affiliation:
W.M. Keck Laboratory of Engineering Materials, Mail Code 138–78, California Institute of Technology, Pasadena, California 91125, USA
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Abstract

Tungsten wire or particle reinforced metallic glass matrix composites are produced by infiltrating liquid Zr57Nb5Al10Cu15.4Ni12.6 (Vit106) into tungsten reinforcements at 1150 K and at 1425 K. X-ray diffraction, differential scanning calorimetry, and scanning electron microscopy are carried out to characterize the composite. The matrix of the composite processed at 1150 K is mostly amorphous, with some embedded crystals. During processing, tungsten dissolves in the glass-forming melt and upon quenching precipitates over a relatively narrow zone near the interface between the tungsten and matrix. In the composites processed at 1425 K, tungsten dissolves in the melt and diffuses through the liquid medium, and then reprecipitates upon quenching. The faster kinetics at this high temperature results uniform distribution of the crystals throughout the matrix. Mechanical properties of the differently processed composites containing wires and particles are compared and discussed. The composites exhibit a plasticity of up to 16 % without sacrificing the high strength to failure that is comparable to monolithic Vit 106.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC9.9
Copyright
Copyright © Materials Research Society 2003

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References

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