Abstract The poor wear performance of copper is improved by reinforcing hard ceramic particles. The present work reports the fabrication of Cu/TiB2 (0, 6, 12, 18 vol.%) copper matrix composites (CMCs) using friction stir processing (FSP). TiB2 particles were initially packed together into a machined groove and were subjected to FSP under a constant set of process parameters. The microstructure was observed using optical, scanning and transmission electron microscopy. The wear behavior was examined using a pin-on-disc apparatus. The micrographs showed a homogeneous distribution of TiB2 particles without aggregation and segregation. The distribution of TiB2 particles was closely persistent across the stir zone. TiB2 particles were well bonded with the copper matrix without any interfacial reaction. Many TiB2 particles fractured during FSP. The grains in the composite were extensively refined because of dynamic recrystallization and pinning effect of TiB2 particles. The wear behavior under dry sliding condition was presented in detail.

中文翻译：

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搅拌摩擦加工制备的Cu/TiB 2 铜基复合材料的显微组织和滑动磨损表征

摘要 通过增强硬质陶瓷颗粒，改善了铜的耐磨性能。目前的工作报告了使用搅拌摩擦加工 (FSP) 制造 Cu/TiB2 (0, 6, 12, 18 vol.%) 铜基复合材料 (CMC)。TiB2 颗粒最初被一起填充到加工槽中，并在一组恒定的工艺参数下进行 FSP。使用光学、扫描和透射电子显微镜观察微观结构。使用销盘式装置检查磨损行为。显微照片显示 TiB2 颗粒分布均匀，没有聚集和偏析。TiB2 颗粒的分布在整个搅拌区中保持紧密。TiB2 颗粒与铜基体结合良好，没有任何界面反应。许多 TiB2 颗粒在 FSP 过程中破裂。由于 TiB2 颗粒的动态再结晶和钉扎效应，复合材料中的晶粒得到了广泛的细化。详细介绍了干滑动条件下的磨损行为。