Evolution of Mechanical Properties of Cast Zr50Cu40Al10 Glassy Alloys by Structural Relaxation

Yoshihiko Yokoyama; Yasutake Akeno; Toru Yamasaki; Peter K. Liaw; Raymond. A. Buchanan; Akihisa Inoue

doi:10.2320/matertrans.46.2755

Evolution of Mechanical Properties of Cast Zr₅₀Cu₄₀Al₁₀ Glassy Alloys by Structural Relaxation

Yoshihiko Yokoyama, Yasutake Akeno, Toru Yamasaki, Peter K. Liaw, Raymond. A. Buchanan, Akihisa Inoue

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Keywords: Zr₅₀Cu₄₀Al₁₀, bulk glassy alloy, structural relaxation, tensile strength, Charpy impact test, cold rolling, shear band

JOURNAL FREE ACCESS

2005 Volume 46 Issue 12 Pages 2755-2761

DOI https://doi.org/10.2320/matertrans.46.2755

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Abstract

The volume of a quenched glassy alloy is a variable of cooling rates during the amorphization. Hence a change in the volume caused by the structural relaxation can be regarded as a degree of amorphousness. The density of Zr₅₀Cu₄₀Al₁₀ bulk glassy alloys (BGAs) increases linearly with the annealing temperature below the glass-transition temperature (T_g). With increasing the annealing temperature, the tensile strength and Vickers hardness show constant values, whereas the Young’s moduli and Charpy impact values become larger and smaller, respectively. Especially, Charpy impact values of Zr–Cu–Al BGAs have a linear relationship with the relative value of excessive free volume, which correspond to the volume-change ratio caused by the full structural relaxation.

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