The mechanical properties including Vickers hardness, tensile properties, fracture toughness, impact toughness and also, the microstructure of copper severely deformed by equal channel angular pressing through route C after two, four, and eight passes at ambient temperature, were studied in the present work. The results indicated that the grains size reduced from 16.7 to 4.8 µm after two and to 2.1 µm after eight passes. This study cleared that because of the recrystallization phenomenon and reducing the effect of stress concentration and increasing the number of grain boundaries, the values of the fracture toughness can increase significantly. For example, fracture toughness increases by 58.4% relative to base metal after eight passes equal channel angular pressing. Also, it was found that the major improvement in tensile properties is achieved after two passes and due to the applied simple shear to the copper, all the equal channel angular pressed specimens have demonstrated an enhanced hardness and impact toughness, in accordance with their number of equal channel angular pressing passes. For example, the Vickers hardness is increased by a factor of 1.98 and impact toughness 58.4% for the extruded material after eight passes.

中文翻译：

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等通道角压铜的显微组织演化及力学行为

本工作研究了机械性能，包括维氏硬度、拉伸性能、断裂韧性、冲击韧性，以及在环境温度下经过 2、4 和 8 道次后，通过 C 路径等通道角挤压严重变形的铜的微观结构。 . 结果表明，晶粒尺寸在两次通过后从 16.7 减少到 4.8 微米，在八次通过后减少到 2.1 微米。该研究表明，由于再结晶现象和减少应力集中的影响和增加晶界数量，断裂韧性值可以显着增加。例如，在八道次等通道角挤压后，断裂韧性相对于母材增加了 58.4%。还，发现拉伸性能的主要改进是在两次通过后实现的，并且由于对铜施加了简单的剪切，所有等通道角压制试样都表现出增强的硬度和冲击韧性，与它们的等通道数量一致角压传球。例如，挤压材料经过八道次后，维氏硬度提高了 1.98 倍，冲击韧性提高了 58.4%。