Abstract The aim of this work was to determine the wear behavior of the f.c.c. medium entropy alloy NiCoCr, which has been shown by others to possess both a very good strength-ductility balance and an especially high fracture toughness. Pins of NiCoCr were tested in dry sliding wear against disks of yttria-stabilized zirconia at a sliding velocity of 0.1 m/s both in air and in argon. Identical wear tests on 316 stainless steel were performed for comparison. It was found that the wear rates of the NiCoCr pins were lower than those of the 316 stainless steel in air, but that the wear rates of the two materials were almost identical in dry argon. Scanning electron microscopy analysis of both the worn pins' surfaces and cross sections indicated that the worn surface of NiCoCr pins were flatter and showed less fracture due to the better toughness compared to the 316 stainless steel pins. Wear tests in air resulted in the formation of oxides. X-ray photoelectron spectroscopy of the NiCoCr pin showed that the oxides in the debris were Cr2O3 and Co2O3. The oxides play an important role in the development of a mechanically mixed layer, which formed on the NiCoCr pin's tip to protect the contacting material during wear tests in air.

中文翻译：

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NiCoCr中熵合金与316不锈钢干滑动磨损行为的比较

摘要 这项工作的目的是确定 fcc 中等熵合金 NiCoCr 的磨损行为，其他人已证明该合金具有非常好的强度-延展性平衡和特别高的断裂韧性。NiCoCr 销在空气和氩气中以 0.1 m/s 的滑动速度对氧化钇稳定的氧化锆盘进行干滑动磨损测试。对 316 不锈钢进行了相同的磨损测试以进行比较。结果发现，NiCoCr 销在空气中的磨损率低于 316 不锈钢，但两种材料在干燥氩气中的磨损率几乎相同。两个磨损销的扫描电子显微镜分析 表面和横截面表明，与 316 不锈钢销相比，NiCoCr 销的磨损表面更平坦，由于韧性更好，因此断裂更少。在空气中的磨损测试导致氧化物的形成。NiCoCr 销的 X 射线光电子能谱表明，碎片中的氧化物是 Cr2O3 和 Co2O3。氧化物在机械混合层的发展中起着重要作用，该混合层形成在 NiCoCr 销的尖端，以在空气中的磨损测试期间保护接触材料。