FeCoCrNiAl high entropy alloy (HEA) matrix composite containing graphite nanoplates has been produced by spark plasma sintering (SPS). The tribological properties of this composite were tribo-tested under various loads and velocities. The results suggested that compared to the HEA, the graphite nanoplates can reduce the coefficient of friction significantly from 0.5 to 0.8 to 0.27–0.16. Under low load and velocity conditions, the reduction of friction reached 80%, and a negligible wear was obtained. Surface and interface analysis indicated that the excellent tribological performance was attributed to the in-situ formed graphene that smeared on the rubbing interface and the tribo-induced oxide layer which contained nanoscale-wear debris and graphene. The oxide scale formation and the evolution of graphene from graphite nanoplate were assessed in detail, the graphene formation process is similar to a ball milling process, and the nanoscale-wear debris formed a ball configuration that exfoliates graphite nanoplates. This work proposed a graphene formation process through the sliding induced milling, especially for the materials containing fine crystals, which contributes to the lubrication.

FeCoCrNiAl 高熵合金 (HEA) 基复合材料包含石墨纳米板已通过放电等离子烧结 (SPS) 生产。这种复合材料的摩擦学性能在各种负载和速度下进行了摩擦测试。结果表明，与 HEA 相比，石墨纳米板可以将摩擦系数从 0.5 显着降低至 0.8 至 0.27-0.16。在低负载和低速度条件下，摩擦减少达到80%，磨损可忽略不计。表面和界面分析表明，优异的摩擦学性能归因于涂抹在摩擦界面上的原位形成的石墨烯和含有纳米级磨损碎片和石墨烯的摩擦诱导氧化层。详细评估了石墨纳米片的氧化皮形成和石墨烯的演化，石墨烯的形成过程类似于球磨过程，纳米级磨损碎片形成球状结构，从而剥离石墨纳米片。这项工作提出了通过滑动诱导研磨形成石墨烯的过程，特别是对于含有细晶的材料，这有助于润滑。