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论文对金属玻璃发生剪切失稳形成剪切带的行为进行了分析,得到了其发生剪切失稳时的临界自由体积浓度,预测结果与实验观察和模拟结果吻合;利用两种方法对其剪切带厚度进行了预测,结果表明基于剪切失稳临界波长预测金属玻璃剪切带厚度的方法只在发生剪切失稳后极短的时间内有效,对成熟剪切带厚度的预测必须考虑自由体积的扩散效应;考察了金属玻璃的宏微观材料参数对其剪切带厚度的影响及其微观机制,发现金属玻璃剪切带厚度对其宏观材料参数(泊松比)不敏感,对与剪切相变区相关的微结构参数敏感.
The paper analyzes the behavior of shearing instability shear bands in metallic glass, and obtains the critical free volume concentration at shear instability. The predicted results are in good agreement with the experimental observations and simulation results. The results show that the method of predicting the thickness of the shear band of metallic glass based on the critical wavelength of shear instability is effective only in a very short time after the shear instability occurs. The prediction of the thickness of the mature shear band must be Considering the diffusion effect of free volume, the influence of macro-and micro-material parameters of metallic glass on the shear band thickness and its microscopic mechanism are investigated. It is found that the thickness of the metallic glass shear band is not sensitive to the macroscopic material parameters (Poisson’s ratio) Sensitive to the microstructure parameters associated with the shear-phase-change region.