STRUCTURE OF HIGH-ENTROPY AlNiCrTiB ALLOY AFTER HIGH-SPEED ELECTRON-BEAM HEAT TREATMENT

Abstract

In this study, the structure and phase composition of lightweight high-entropy AlNiCrTiB alloy produced by mechanical alloying followed by electron-beam treatment were investigated. The in-situ formation of TiB and Cr2B3 boride phases during high-temperature exposure was confirmed. It was shown that remelting of the surface layer leads to the formation of a metallic matrix containing large, , edged boride inclusions, whereas more uniform heating at lower temperatures promotes the growth of finely dispersed TiB particles through the interaction of titanium with boron. A thin TiB-enriched transition layer forms between the remelted surface and the inner regions, facilitating the development of a homogeneous composite structure composed of a metallic matrix reinforced with dispersed boride inclusions.