Plasma nitriding is successfully employed in treating Al_xCoCrFeNi high-entropy alloys (HEAs) with finely-divided Al content (i.e., x values in molar ratio, x = 0.1- 0.8) to develop wear-resistant structural materials. Nitridation greatly removes the Al from the matrix that completely deplete the Ni-Al enriched phase, forming nanoscaled nitrides (AlN and CrN) precipitations near the surface. Nitriding promotes the hardness of present alloys with values widely ranging from 276 HV to 722 HV. Interestingly, the higher content the Al, the smaller thickness the nitrides layer, but the higher hardness due to the increased amount of hard nitrides phases and volume fraction of BCC phase. Significantly, plasma nitriding considerably improves the wear resistance of Al_xCoCrFeNi HEAs by 4–18 times.

等离子体氮化已成功地用于处理Al含量细分的Al _x CoCrFeNi高熵合金（HEA）（即x的摩尔比，x = 0.1- 0.8），从而开发出耐磨的结构材料。氮化可从基体中完全去除Al，从而完全耗尽富集Ni-Al的相，从而在表面附近形成纳米级氮化物（AlN和CrN）沉淀。渗氮可提高当前合金的硬度，其值范围从276 HV至722 HV。有趣的是，Al含量越高，氮化物层的厚度越小，但是由于硬氮化物相的数量增加和BCC相的体积分数增加，硬度也更高。显着地，等离子体氮化大大改善了Al的耐磨性_x CoCrFeNi HEA的4-18倍。