Thermal Analysis and Nanoindentaion Studies on Nanocrystalline AlCrNiFeZn High Entropy Alloy

Abstract

The nanocrystalline AlNiFeCrZn pentanary high entropy alloy was synthesised by mechanical alloying (MA) and characterised by XRD, SEM and TGA. The AlNiFeCrZn high entropy alloy is mainly BCC structure with a crystallite size less than 10nm in as milled condition. It retained its nanosrtructure at elevated temperature of 850 oC and it is found to be thermally stable without phase transformation. The 30 hr milled AlNiFeCrZn alloy powder was consolidated using hot compaction unit at 850 oC for 2hr. From Nanoindendation measurements on consolidated samples, hardness and Young's modulus values are found to be 7.427 and 153.03 GPa respectively.