Metallic Glass Zr₅₇Cu₂₀Al₁₀Ni₈Ti₅-Tungsten Composites

Abstract

Composite is prepared by mixing Zr₅₇Cu₂₀Al₁₀Ni₈Ti₅ and W powders and compaction in a WC system at a temperature between the glass transition temperature (T _g ) and crystallization temperature (T _x ), using the viscous flow behaviour of the metallic glass to form the matrix. Compaction and sintering (by hot pressing and Spark Plasma Sintering) of the metallic glasses (MG) powder is reported in detail, emphasizing detrimental evolution of the amorphous phase during the milling process for viscous flow. This drawback is overcome using an atomized powder.

Keywords:

• Composites
• Metallic glasses
• Spark Plasma Sintering
• Viscous flow

ACKNOWLEDGMENTS

This work is supported by the French Ministry of Defence. L. Dembinski of the UTBM laboratory and J. L. Soubeyroux of the CRETA laboratory are thanked for, respectively, the successful atomization and the technical support for preparation of the pre-alloys. The authors are also grateful to A. Valette for SEM analysis and B. Villeroy for SPS experiments.