Effect of annealing on phase composition and morphology of AlCoCrFeMnTi high entropy alloy

doi:10.13251/j.issn.0254-6051.2020.04.030

Abstract

Abstract: Effect of annealing temperature on the phase constitution, microstructure and hardness of AlCoCrFeMnTi high entropy alloy were tested by means of XRD, OM, SEM and microhardness tester. The results show that the phase structure of as-cast AlCoCrFeMnTi high entropy alloy is composed of bcc main phase and fcc phase, and the diffraction peaks of each phase are generally wider, which is due to lattice distortion caused by large difference of alloy atomic radius and fast cooling rate. The microstructure of AlCoCrFeMnTi alloy is composed of dendrite and intergranular, and is the typical dendrite structure. A new hcp phase is formed in this alloy when annealed at 600 ℃. The peak shape of the diffraction peak does not change significantly when annealed at 800 ℃ and 1000 ℃. The microstructure of the as-cast AlCoCrFeMnTi alloy and the annealed alloy are all typical dendritic structure. Typical amplitude-modulated decomposition structure is revealed by scanning electron micrograph after annealing at 1000 ℃. The hardness of the as-cast alloy is the largest (750 HV0.5) and decreases gradually with the increase of annealing temperature. After annealing at 1000 ℃, the alloy is deformed due to the amplitude-decomposing structure in the alloy. Supersaturated atoms are shifted in a large amount, which reduces the degree of lattice distortion and leads to a decrease of hardness. On the other hand, due to the increase of the annealing temperature, the atomic diffusion capacity is accelerated and the internal stress of the alloy is lowered. At this time, the hardness of the alloy drops to 604.9 HV0.5.

Key words: high entropy alloy, annealing, microstructure, hardness

CLC Number:

TG113.1

Wang Zhixin, Zhou Jiachen, Ma Mingxing, Lu Jinbin, Zhu Dachuan, Zhang Deliang. Effect of annealing on phase composition and morphology of AlCoCrFeMnTi high entropy alloy[J]. Heat Treatment of Metals, 2020, 45(4): 144-148.

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