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Effect of sample size on ductility of metallic glass

机译:样品量对金属玻璃延展性的影响

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摘要

With decreasing sample dimension, the compressive plastic strain of a Zr-based metallic glass increases from near zero to as high as 80 percent without failure. This indicates that macroscopically brittle or ductile deformation behaviour can occur in chemically and structurally identical metallic glass. A concept of critical shear offset is proposed to explain the strong size effect on the enhanced plasticity of metallic glass by taking the shear fracture energy density into account. This finding provides new understanding on the principle that for metallic glass 'smaller is more ductile', even on the macroscopic scale.
机译:随着样品尺寸的减小,基于Zr的金属玻璃的压缩塑性应变会从接近零增加到高达80%,而不会发生故障。这表明在化学和结构上相同的金属玻璃中可能发生宏观脆性或延性变形行为。提出了临界剪切偏移量的概念,以通过考虑剪切断裂能密度来解释金属玻璃增强塑性方面的强烈尺寸效应。这一发现为金属玻璃的原理提供了新的理解,即即使在宏观尺度上,“更小,更易延展”。

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