Cu45Zr45Al5Ag5 Bulk Glassy Alloy with Enhanced Compressive Strength and Plasticity at Cryogenic Temperature

Asahi Kawashima; Takahiro Okuno; Hiroaki Kurishita; Wei Zhang; Hisamichi Kimura; Akihisa Inoue

doi:10.2320/matertrans.MRP2007161

Cu₄₅Zr₄₅Al₅Ag₅ Bulk Glassy Alloy with Enhanced Compressive Strength and Plasticity at Cryogenic Temperature

Asahi Kawashima, Takahiro Okuno, Hiroaki Kurishita, Wei Zhang, Hisamichi Kimura, Akihisa Inoue

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Keywords: Cu₄₅Zr₄₅Al₅Ag₅ bulk metallic glass, compressive strength, plasticity, cryogenic temperature

JOURNAL FREE ACCESS

2007 Volume 48 Issue 10 Pages 2787-2790

DOI https://doi.org/10.2320/matertrans.MRP2007161

View "Advance Publication" version (September 12, 2007).

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Abstract

Compressive tests were made for the as-cast Cu₄₅Zr₄₅Al₅Ag₅ bulk glassy alloy rods with a diameter of 3 mm at 298 and 77 K, at an initial strain rate of 5×10⁻⁴ s⁻¹. It was found that at 77 K, the compressive yield strength, maximum strength and plastic strain to fracture of the glassy alloy rod are higher than those at 298 K. The maximum strength measured at 77 K is about 13% larger than that measured at 298 K. In particular, its plasticity at 77 K is significantly enhanced. SEM observations reveal that more shear bands appear near the fracture plane at 77 K. The higher strength and ductility at a cryogenic temperature (77 K) are probably due to the lower mobility of the squeezed free volume.

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