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Creation of heterogeneous microstructures in copper using high-pressure torsion to enhance mechanical properties

机译：使用高压扭转产生铜中的异质微观结构，提高力学性能

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This paper studies the effects of high-pressure torsion (HPT) at ambient temperature on microstructural evolution and mechanical properties enhancement in pure copper. The aim is to introduce gradient microstructure, with various statistical distributions of grain size and grain orientations to examine their effect on strength and ductility. To this end, extruded cylindrical pure copper subjected to HPT for 1, 2, and 3-turns resulted in grain refinement down to the grain size of 500 nm. Combination of microhardness test and EBSD scans through the radial direction confirm the creation of a heterogeneous structure through the thickness and radial directions. The results demonstrate that increasing the shear strain leads to (1) ultra-fine grain (UFG) generation at deformed coarse-grain boundaries, (2) an increase in the fraction of recrystallized grains and high angle grain boundaries, and (3) a homogenous structure in the last step. A unique mixture has been obtained due to the particular shape of the anvils. The mixture included a chain of UFGs and coarse grains contain dislocations and subgrains. The highest level of gradient structure through the thickness was observed after 1-turn, which leads to the best combination of strength and ductility.
机译：本文研究了高压扭转（HT）在环境温度对纯铜的微观结构演化和力学性能增强的影响。目的是引入梯度微观结构，具有各种晶粒尺寸和晶粒取向的统计分布，以检查它们对强度和延展性的影响。为此，对HPT进行HPT的挤出圆柱纯铜，导致晶粒细化至500nm的晶粒。微硬度测试和EBSD通过径向扫描的组合确认通过厚度和径向产生异质结构。结果表明，在变形的粗晶界限下增加剪切应变导致（1）超细晶粒（UFG）产生，（2）重结晶晶粒和高角度晶界的分数增加，和（3）a最后一步的均匀结构。由于砧座的特定形状，已经获得了独特的混合物。混合物包括UFG链和粗晶粒含有脱位和亚甲。 1转后观察到通过厚度的最高水平的梯度结构，这导致强度和延展性的最佳组合。

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