ABSTRACT The study presents an analysis specifically on the effect of tool traverse speed (one of the most influential process parameters of friction stir processing) on the microstructural evolution, microhardness, tensile behaviour, and tribological characteristics of CuNi/B4C surface composite. The friction stir processing trials were performed at the following tool traverse speeds: 20, 25, 30, 35, and 40 mm min−1. The microstructural analysis confirmed the homogeneous dispersion/agglomeration of B4C particles in the specimens that are friction stir processed at low/high traverse speed. The results indicate that friction stir processing of specimens beyond tool traverse speed of 30 mm min−1 results in undesirable microhardness, tensile strength, and wear resistance. A comprehensive correlation of microstructural evolution with the mechanical properties, fracture mechanism, and tribological characteristics of the fabricated surface composites is presented.

中文翻译：

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刀具移动速度对CuNi/B4C表面复合材料微观结构和力学性能的影响

摘要 本研究专门分析了刀具移动速度（搅拌摩擦加工中最有影响的工艺参数之一）对 CuNi/B4C 表面复合材料的微观结构演变、显微硬度、拉伸行为和摩擦学特性的影响。摩擦搅拌加工试验在以下工具移动速度下进行：20、25、30、35 和 40 mm min-1。微观结构分析证实了 B4C 颗粒在以低/高移动速度进行摩擦搅拌处理的样品中的均匀分散/团聚。结果表明，超过 30 mm min-1 的刀具移动速度对试样进行搅拌摩擦处理会导致显微硬度、拉伸强度和耐磨性不理想。