Microstructure and aging behaviour of Al₅Cr₃₂Fe₃₅Ni₂₂Ti₆ high entropy alloy

C.-W. LinDepartment of Materials Science and Engineering, National Tsing Hua University, Hsinchu30013, Taiwan

M.-H. TsaiDepartment of Materials Science and Engineering, National Chung Hsing University, Taichung40227, TaiwanCorrespondence[email protected]

C.-W. TsaiDepartment of Materials Science and Engineering, National Tsing Hua University, Hsinchu30013, Taiwan

J.-W. YehDepartment of Materials Science and Engineering, National Tsing Hua University, Hsinchu30013, Taiwan

S.-K. ChenCenter for Nanotechnology, Materials Science, and Microsystems, National Tsing Hua University, Hsinchu30013, Taiwan

Abstract

The Al₅Cr₃₂Fe₃₅Ni₂₂Ti₆ high entropy alloy was designed, and its microstructure, mechanical properties, corrosion resistance and aging behaviour were investigated. The as cast and as homogenised alloys were composed of three phases: body centred cubic, face centred cubic and Ni₂AlTi Heusler phases. Aging at 700–900°C triggers the formation of various phases including sigma-CrFe, eta-Ni₃Ti and Ni₂AlTi Heusler phase and leads to significant age hardening and a maximum hardness of 900 HV. Additionally, the corrosion resistance of the Al₅Cr₃₂Fe₃₅Ni₂₂Ti₆ alloy is found better than that of 316L stainless steel in 0.5M H₂SO₄ solution.

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Microstructure and aging behaviour of Al₅Cr₃₂Fe₃₅Ni₂₂Ti₆ high entropy alloy

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Microstructure and aging behaviour of Al₅Cr₃₂Fe₃₅Ni₂₂Ti₆ high entropy alloy