Microstructure, Phase Relations, and Precipitation Hardening Studies in Mg Containing CoCrCuFeNi High-Entropy Alloys

Abstract

CoCrCuFeNi high-entropy alloys (HEAs) have high ductility owing to their unique two-phase microstructure. Phase relations and microstructure evolution were investigated by scanning electron microscopy coupled with energy dispersive spectrometry and differential thermal analysis. These results contributed to clarifying the formation mechanism of the HEA microstructures. The effects of Mg addition as an alloying element in HEAs were also studied, with respect to precipitation hardening, thereby aiming to obtain strength-ductility balanced HEAs.

Characterization and Wear Behavior of CoCrNi Medium Entropy Alloy Coating on Al Alloy by Resistance Seam Processing

“…Recently, the outstanding physical and mechanical properties of the multi-principal element alloys (i.e., high entropy alloys (HEAs) and medium entropy alloys (MEAs)) have attracted considerable attention in the scientific community. 5,6) The MEAs are equiatomic alloys composed of two to four principal elements. 7,8) Among many MEAs, the CoCrNi MEA with an FCC solid solution has demonstrated superior hardness and toughness properties.…”

“…Currently, there are very limited reports about CoCrNi MEA coating. Cao et al 6) fabricated the CrCoNi MEA coating on AISI M2 steel substrates by DC magnetron sputtering and the nanotwinned structure was the main reason for its high hardness and damage tolerance. Feng et al 15) prepared the CoCrNi MEA coating on an A36 steel plate using laser cladding, and the coating exhibited better corrosion resistance than the substrate.…”