Undeformed face-centred cubic (FCC) high-entropy alloys (HEAs) always possess excellent plasticity but low hardness. In this work, Al alloying on the surface of a CrCoFeNi FCC HEA is realized by laser alloying technique. An Al_1.5CoCrFeNi body-centred cubic (BCC) HEA is in-situ generated on the surface of the FCC HEA. The well-bonding BCC HEA layer possesses a hardness as high as 536 HV. The hard surface results in a much lower wear rate of the Al-alloyed specimen than the pristine specimen. This study provides a simple strategy to harden the FCC HEAs by in-situ formation of BCC HEA through laser alloying.

未变形的面心立方 (FCC) 高熵合金 (HEAs) 始终具有优异的塑性但硬度较低。在这项工作中，通过激光合金化技术实现了 CrCoFeNi FCC HEA 表面的 Al 合金化。在 FCC HEA 表面原位生成Al _1.5 CoCrFeNi 体心立方 (BCC) HEA。结合良好的 BCC HEA 层具有高达 536 HV 的硬度。坚硬的表面导致铝合金试样的磨损率比原始试样低得多。本研究提供了一种通过激光合金化原位形成 BCC HEA来硬化 FCC HEA的简单策略。