In this study, microstructural features and mechanical properties developed in the stir zone (SZ) of copper was analysed while employing different pin eccentricities (0, 0.3 and 0.6 mm) during friction stir processing. Friction stir processing led to substantial grain refinement which further enhanced with pin eccentricity. Specimen processed with 0.3 mm of pin eccentricity displayed finer grain and hence highest hardness and tensile properties, associated to increased grain boundary strengthening.

中文翻译：

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工具销偏心距对搅拌摩擦加工铜的组织和力学性能的影响

在这项研究中，分析了在搅拌区域内采用不同销偏心度（0、0.3和0.6 mm）的铜的搅拌区（SZ）产生的微观结构特征和力学性能。搅拌摩擦加工导致晶粒细化，并随着销的偏心度进一步提高。用0.3 mm销偏心距加工的试样显示出更细的晶粒，因此具有最高的硬度和拉伸性能，与增强的晶界强化相关。