Abstract Al–Cu matrix composites with 5 wt% of graphite nanoplatelets additives were prepared using mechanical alloying (MA) of elemental Al–Cu–C powder mixtures followed by hot pressing at 480–510 °C and 30 MPa. The obtained powders and sintered samples were studied using scanning electron microscopy (SEM), X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and Raman spectroscopy. MA of Al–Cu powders during 8 h with and without graphite additives resulted in formation of approximately the same final phase composition: Cu9Al4 + CuAl2 + Al(Cu), but Al–Cu–C powders contained a larger volume fraction of highly refined particles. The crystalline structure of the graphite additives was shown to transform into amorphous one during MA and into Al4C3 phase during the consequent sintering. The influence of graphite additives on microstructure and mechanical properties of sintered Al–Cu composites is considered. Possible strengthening mechanisms for Al–Cu and Al–Cu/C composites are discussed.

中文翻译：

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石墨添加剂对机械合金化烧结法制备的Al-Cu复合材料组织和力学性能的影响

摘要 使用元素 Al-Cu-C 粉末混合物的机械合金化 (MA) 然后在 480-510 °C 和 30 MPa 下热压制备了含有 5 wt% 石墨纳米片添加剂的 Al-Cu 基复合材料。使用扫描电子显微镜 (SEM)、X 射线衍射仪 (XRD)、差示扫描量热法 (DSC) 和拉曼光谱对所得粉末和烧结样品进行研究。含和不含石墨添加剂的 Al-Cu 粉末在 8 小时内的 MA 导致形成大致相同的最终相组成：Cu9Al4 + CuAl2 + Al(Cu)，但 Al-Cu-C 粉末包含更大体积分数的高度细化颗粒. 石墨添加剂的晶体结构在 MA 过程中转变为无定形结构，在随后的烧结过程中转变为 Al4C3 相。考虑了石墨添加剂对烧结铝铜复合材料的微观结构和力学性能的影响。讨论了 Al-Cu 和 Al-Cu/C 复合材料的可能强化机制。