Abstract High strength, ductile and wear-resistant alloys are required for engineering applications. This work reports a good combination of mechanical and tribological properties in (NiAl)x(FeCr)yCo(x+y)/2 high-entropy alloys (HEAs) via adjusting A2/B2 nano-coupled heterostructure. The A2/B2 heterostructure switches from weave to network structure by increasing x:y ratio from 1:1.3 to 1:1, and eventually forms an island structure when x:y ratio is 1.3:1. Concurrently, the grain boundary FCC phase transforms from continuous to discontinuous as its fraction decreases. The island-like A2/B2 heterostructure provides (NiAl)1.3(FeCr)Co1.15 HEA a good compressive yield strength of 1.7 GPa and plasticity of 23.4%. Additionally, (NiAl)1.3(FeCr)Co1.15 HEA has the promising wear-resistance from room temperature to 800 °C, ascribing to its excellent strength and the protective tribo-layer at high temperatures.

中文翻译：

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纳米耦合异质结构在 AlCoCrFeNi 高熵合金中诱导优异的机械和摩擦学性能

摘要 工程应用需要高强度、韧性和耐磨合金。这项工作通过调整 A2/B2 纳米耦合异质结构，报告了 (NiAl)x(FeCr)yCo(x+y)/2 高熵合金 (HEAs) 的机械和摩擦学性能的良好组合。A2/B2异质结构通过将x:y比从1:1.3增加到1:1而从编织结构切换到网络结构，最终在x:y比为1.3:1时形成岛状结构。同时，随着其分数的减少，晶界 FCC 相从连续变为不连续。岛状 A2/B2 异质结构为 (NiAl)1.3(FeCr)Co1.15 HEA 提供了 1.7 GPa 的良好压缩屈服强度和 23.4% 的塑性。此外，(NiAl)1.3(FeCr)Co1.15 HEA 从室温到 800 °C 具有良好的耐磨性，