Significant reduction in friction and wear of a high-entropy alloy via the formation of self-organized nanolayered structure

摘要

Sliding wear-induced nanolayering and its positive impact on wear resistance have been observed in conventional binary alloys with a matrix of high stacking fault energy(SFE),but this concept has never been reported in high-entropy alloys(HEAs)with low SFE.Here,we design and fabricate a(CoCrFeNi)_(90)Ag_(10)HEA,consisting of a face-center-cubic(fcc)CoCrFeNi HEA matrix with low SFE and uniformly dispersed Ag precipitates.In comparison with CoCrFeNi,a significant reduction in friction and wear was found in(CoCrFeNi)_(90)Ag_(10)HEA through the spontaneous formation of nanolayered subsurface microstructure during wear.The finding suggests a novel approach for designing HEAs that can achieve low friction and wear.