Processability of AlCoCrFeNi high entropy alloy fabricated by selective laser melting

doi:10.13251/j.issn.0254-6051.2022.12.005

Abstract

Abstract: AlCoCrFeNi high entropy alloy was fabricated by selective laser melting (SLM) technology. The effect of laser process parameters on processability, densification, microstructure and mechanical properties was studied. The results show that the relative density gradually increases with the increase of volumetric energy density. The best process parameters is the laser power of 50 W, the scanning speed of 300 mm/s, the scanning spacing of 70 μm and the layer thickness of 30 μm. The as-cast and SLMed alloy has a dual-phase body-centered cubic structure composed of disordered BCC phase (A2) and ordered BCC phase (B2). Due to the fine grain strengthening effect, the SLMed specimen has higher microhardness than that of the as-cast one, but the compressive yield strength decreases. The reason is due to the defects such as cracks and holes in the SLMed specimen.

Key words: selective laser melting, AlCoCrFeNi high entropy alloy, mechanical properties

CLC Number:

TG456.7

Wei Shuimiao, Ma Pan, Zhang Zhiyu, Fang Yacheng, Yang Zhilu, Zhang Nan. Processability of AlCoCrFeNi high entropy alloy fabricated by selective laser melting[J]. Heat Treatment of Metals, 2022, 47(12): 28-35.

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