The effect of annealing temperature on the microstructure, mechanical and electrochemical properties of arc-melted AlCrFeMnNi equi-atomic high entropy alloy
Masemola, Khumo Popoola, Patricia Malatji, Nicholus
Masemola, Khumo
Popoola, Patricia
Malatji, Nicholus
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Abstract
In this work, an equiatomic AlCrFeMnNi high entropy alloy (HEA) was fabricated through an arc-melting and casting process. As-cast alloy ingot was annealed for 2 h at various
temperatures to investigate the effect of heat treatment temperature on the microstructure, mechanical performance and electrochemical behaviour of the alloy. The morphology of the
as-cast HEA consisted of interdendritic rich-Al + Ni BCC (B2) phase and majority dendriticmatrix consisting largely of rich-Cr BCC phase. Annealing higher than 400◦C, promoted the formation of FCC structure which increased in volume to 800◦C. Increase in heat treatment temperature coarsened the grains leading to a decrease in hardness and increase in coefficient friction. A good combination of strength and ductility was observed when annealing was performed at 600◦C. Anticorrosion properties were improved after annealing. However, high temperature annealing lowered corrosion resistance due to the galvanic effect. The alloys demonstrated high corrosion rate in acidic condition.
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Date
2020-04-04
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Elsevier B.V.
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Keywords
High entropy alloys, Annealing, Compression, Wear and corrosion