ABSTRACT

Effects of cryogenic thermal cycling (CTC) on mechanical properties and serrated flow of the Zr_52.5Cu_17.9Ni_14.6Al₁₀Ti₅ bulk metallic glass were studied. The improved plasticity, a slightly reduced yield stress and abundant small serrations could be signs of rejuvenation. The high disorder degree result from rejuvenation increases the volume of shear transformation zones (STZs), and thus leads to the enhancement of plasticity. The larger plasticity of BMGs is realised through the superimposed effect of two favourable factors (CTC treatment and strain rate). In this case, the experimental failure threshold is far below the theoretical value. It provides a new idea for designing ductile BMGs.

摘要

研究了低温热循环 (CTC) 对 Zr _52.5 Cu _17.9 Ni _14.6 Al ₁₀ Ti ₅块状金属玻璃力学性能和锯齿流动的影响。改善的可塑性、略微降低的屈服应力和丰富的小锯齿可能是恢复活力的迹象。再生导致的高无序度增加了剪切转变区（STZ）的体积，从而导致可塑性增强。BMGs 更大的可塑性是通过两个有利因素（CTC 处理和应变速率）的叠加作用实现的。在这种情况下，实验失败阈值远低于理论值。它为设计可延展的 BMG 提供了一种新思路。