Influence of heat treatment on Al0.5Cr0.5Ni0.5TiZr1.5Nb1.5 high entropy alloy

High temperatures applications require special alloys caring superior properties that are stable at elevated temperatures. High entropy alloys are an emerging set of alloys mostly composed of a minimum of 5 or more elements in equimolar or non-equimolar ratio that develops outstanding properties such as mechanical strength, hardness, stiffness and corrosion resistance. Present work investigates the structure and properties of an as-cast and heat treated Al0.5Cr0.5Ni0.5TiZr1.5Nb1.5 high entropy alloy. The alloy specimens were cast by induction melting in Ar protective atmosphere, heat treated at 700÷1000°C for 10 hours and characterized by structural and mechanical techniques. Scanning electron microscopy analysis on as cast sample presents a homogenous dendritic structure well developed and distributed in the central area but underdeveloped on the side areas of the alloy. Heat treated sample reveals grains growth and higher structural homogeneity. © 2020, Politechnica University of Bucharest. All rights reserved.