Inhomogeneity inhibiting embrittlement of Zr-based bulk metallic glass

doi:10.13251/j.issn.0254-6051.2023.02.025

Abstract

Abstract: Correlation between compressive plasticity at ambient temperature and microstructure of as-cast and annealed Zr_47.25Cu_47.25Al_5.5bulk metallic glass (BMG) was studied. The results show that the compressive plasticity of the as-cast Zr_47.25Cu_47.25Al_5.5BMG is 3.96%, and the compressive plasticity of the alloys is improved after annealing for 0.5, 1.5, 3 and 6 h, respectively. After annealing for 0.5 h, the compressive plasticity is the largest of 5.84%. The microstructure of the as-cast Zr_47.25Cu_47.25Al_5.5BMG presents a network distribution of about 5 nm. After annealing for 6 h, the size of the Cu-rich network zone is about 50 nm with a small amount of crystallization. This microstructure inhomogeneity leads to the plasticity of the as-cast alloy at ambient temperature, and inhibits the embrittlement which is caused by the reduction of free volume during annealing.

Key words: bulk metallic glass, low temperature annealing, plasticity, inhomogeneity

CLC Number:

TG166.7

Hou Qiqi, Zhou Jialu, Wang Tuo. Inhomogeneity inhibiting embrittlement of Zr-based bulk metallic glass[J]. Heat Treatment of Metals, 2023, 48(2): 164-169.

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