Grain Boundary Wetting Phenomena in High Entropy Alloys Containing Nitrides, Carbides, Borides, Silicides, and Hydrogen: A Review

In this review, we analyze the structure of multicomponent alloys without principal components (they are also called high entropy alloys—HEAs), containing not only metals but hydrogen, nitrogen, carbon, boron, or silicon. particular, discuss phenomenon grain boundary (GB) wetting by melt solid phase. The GB can be complete incomplete (partial). former case, grains matrix completely separated continuous layer second phase (solid liquid). latter case partial wetting, forms, between grains, a chain (usually lenticular) precipitates droplets with non-zero value contact angle. To deal morphology GBs, new tie-lines used, which constructed in two- multiphase areas multidimensional HEAs diagrams. GBs contain hydrides, nitrides, carbides, borides, silicides. Thus, silicides used so-called chemical engineering order to improve properties respective HEAs.