Song Wenli, Meng Xiaohe, Wu Yuan, Cao Di, Wang Hui, Liu Xiongjun, Wang Xianzhen, Lu Zhaoping
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
Sci Bull (Beijing). 2018 Jul 15;63(13):840-844. doi: 10.1016/j.scib.2018.04.021. Epub 2018 May 25.
In this paper, effects of cryogenic thermal cycling on deformation behavior and thermal stability of the ZrCuAl bulk metallic glass (BMG) were studied. The results show that with the increase of the number of cryogenic thermal cycles (CTC), thermal stability remains almost unchanged, while the plasticity is increased, indicating that the cryogenic thermal cyclic treatment is an effective way to improve plasticity of metallic glasses without distinctly deteriorating thermal stability. Our analysis suggests that the increase in the defect density resulted from the cryogenic thermal treatments are responsible for the plasticity increment. Variation of yield strength can be well interpreted from microstructural percolation which affected by both density and characteristic volume of the defect sites.
本文研究了低温热循环对ZrCuAl块体金属玻璃（BMG）变形行为和热稳定性的影响。结果表明，随着低温热循环（CTC）次数的增加，热稳定性几乎保持不变，而塑性增加，这表明低温热循环处理是提高金属玻璃塑性而不明显降低热稳定性的有效方法。我们的分析表明，低温热处理导致的缺陷密度增加是塑性增加的原因。屈服强度的变化可以从受缺陷部位密度和特征体积影响的微观结构渗流得到很好的解释。
