Effect of annealing on microstructure and hardness of AlCuFeNiTiCrx high entropy alloys

doi:10.13251/j.issn.0254-6051.2023.02.026

Abstract

Abstract: AlCuFeNiTiCr_x(x=0.5, 1.0, 1.5, 2.0) high entropy alloys were prepared by copper mold suction casting method, then the specimens were annealed at 1000 ℃ for 3 h. Microstructure evolution and hardness of as-cast and as-annealed AlCuFeNiTiCr_x(x=0.5, 1.0, 1.5, 2.0) alloys were tested by X-ray diffraction (XRD), optical microscope, Vickers hardness tester, respectively. It is found that both of the as-cast and the as-annealed specimens consist only simple body-centered cubic (BCC) and face-centered cubic (FCC) solid solution phases, while the FCC phase in the as-annealed specimens increases compared with that in the as-cast specimens. There are only dendrite and interdendrite phases for both the as-cast and the as-annealed alloys, though the microstructure becomes more homogeneous after annealing according to the metallographical micrographs. The hardness increases with the increase of Cr content, and the as-annealed hardness values are much higher than the as-cast ones because the increase of FCC phase in the as-annealed specimens.

Key words: high entropy alloys(HEAs), annealing, microstructure, hardness

CLC Number:

Zhang Xiaorong, Shang Hualong. Effect of annealing on microstructure and hardness of AlCuFeNiTiCr_x high entropy alloys[J]. Heat Treatment of Metals, 2023, 48(2): 170-173.

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Effect of annealing on microstructure and hardness of AlCuFeNiTiCr_x high entropy alloys

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