The effect of ageing on the microstructure and hardness of Al10Co25Cr8Fe15Ni36Ti6 high entropy alloys

Document Type : Original Article

Authors

ebrahim yousefi ¹

Masumeh Seifollahi ²

seyed mahdi Abbasi ³

¹ Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology.

² Faculty of materials and manufacturing, malek ashtar university of technology

³ Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology

10.22067/jmme.2023.80793.1101

Abstract

The effect of ageing time and temperature on the microstructure and hardness of Al₁₀Co₂₅Cr₈Fe₁₅Ni₃₆Ti₆ high entropy alloys is investigated in this article. The alloy melted in vacuum induction melting furnace and purified using vaccum arc remelting process. Then homogenized at 1220°C for 17 hours. Then sample aged at 850, 900 and 950°C for 1-16 hours and assessed using XRD and SEM. The microstructure is involved ′γand NiAl precipitates and γ matrix. With increasing ageing temperature, the volume fraction and size of ′γ decreased from 60 Vol% and 338 nm at 850°C to 31 Vol% and 123 nm at 950°C, respectively. The ′γprimary morphology is cubic which changed to square and semi-square like. The hardness of alloy is 314, 329 and 327 Hv at 850, 900 and 950 °C, respectively. According to these results, 850°C for 8 hours is the best ageing conditions. The best high temperature tensile properties of 840.9 MPa ultimate tensile strength and 17.9 elongation obtained at 850 °C.

Keywords

high entropy alloys

Al10Co25Cr8Fe15Ni36Ti6

gamma prime

microstructure

hardness

Subjects

• Advanced Materials

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