Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting

Version 1 : Received: 20 June 2022 / Approved: 21 June 2022 / Online: 21 June 2022 (10:52:27 CEST)

A peer-reviewed article of this Preprint also exists.

Campari, E.G.; Casagrande, A. Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting. Materials 2022, 15, 5544. Campari, E.G.; Casagrande, A. Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting. Materials 2022, 15, 5544.

Abstract

The high entropy alloy (HEA) of equiatomic composition CrNiFeCoMn and with FCC crystal structure was additively manufactured with a selective laser melting (SLM) process starting from mechanically alloyed powders. The as produced alloy shows finenitride and  phase pre-cipitates, which are Cr-rich and stable up to about 900 K. The precipitates increase in number and dimensions after long-period annealing at 900-1300 K, with a change in the HEA mechanical properties. Higher aging temperatures in furnace, above 1300 K, turn the alloy in a single FCC structure, with disappearance of the nitrate and  phase precipitates inside the grains and at the grain boundaries, but with still a presence of a finer Cr-rich nitride precipitation phase. These re-sults suggest that the as-produced HEA is a supersatured solid solution at low and intermediate temperature with nitrides and  nanostructures.

Keywords

high entropy alloys; selective laser melting; microstructure; mechanical properties; strengthening mechanism

Subject

Chemistry and Materials Science, Metals, Alloys and Metallurgy

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