方向错误
材料科学
电子背散射衍射
剪切(地质)
微观结构
变形机理
复合材料
变形(气象学)
临界切应力
剪切矩阵
冶金
合金
晶界
剪切带
铜
剪切带
单剪
剪切速率
非晶态金属
地质学
古生物学
粘度
构造学
作者
Julián Escobar,Joshua Silverstein,Farhan Ishrak,Lei Li,Ayoub Soulami,Shuang Li,Anqi Yu,Suveen Mathaudhu,Ángel L. Ortiz,Carl C. Koch,Arun Devaraj,Mert Efe,Bharat Gwalani
标识
DOI:10.1016/j.msea.2023.145715
摘要
Understanding the mechanisms behind microstructural evolution during shear deformation has been a long-standing area of interest. However, establishing a connection between microstructure, mechanical properties, and the extent of shear deformation is challenging and requires refined experimental approaches. Shear-punch testing (SPT) provides a controlled method to introduce shear into small volumes of material that later can be subjected to detailed microstructural characterization. In this study, we utilize an SPT device to induce shear deformation to pure copper (Cu) and a binary copper-chromium (Cu-Cr) alloy. Electron backscatter diffraction and transmission electron microscopy were used to study the mechanisms of plastic deformation after SPT. Our results indicate that shear deformation of pure Cu produces a dense network of intercepting microshear bands upon sustained deformation. Twin boundaries in annealed Cu undergo transformation into high-angle grain boundaries due to simultaneous deviation from the axis-angle pair condition of 60° misorientation on [111] direction. The presence of 50 vol% Cr particles in the soft Cu matrix altered the shear deformation mechanism. Preferential deformation of the Cu matrix in Cu-Cr alloy led to accelerated shear-induced formation of low and high-angle grain boundaries and subsequent grain refinement. Comparatively, insignificant grain refinement occurred in pure Cu samples even at a strain ∼10 times larger (ε = 4.73) than that of the Cu-Cr case (ε = 0.42). This study sheds light on the microstructural evolution of Cu during shear deformation and highlights the significant influence of a hard second phase in modifying the microstructural response mechanisms of a softer matrix.
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