不同轧制温度对AlCoCrFeNi<sub>2.1</sub>共晶高熵合金组织与力学性能的影响

doi:10.11896/cldb.21120021

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Abstract AlCoCrFeNi_2.1 eutectic high entropy alloy is composed of lamellar structure with alternating body-centered cubic phase and face-centered cubic phase. This unique microstructure makes it have good mechanical properties, which attracts attention. At the same time, the hard and brittle body-centered cubic phase with coarse lamellar shape limits the further improvement of the mechanical properties of AlCoCrFeNi_2.1 eutectic high entropy alloy. In this work, hot rolling and annealing methods were used to further improve the mechanical properties of the as-cast AlCoCrFeNi_2.1 eutectic high entropy alloy. In this experiment, the hot rolling temperatures were selected as 800 ℃, 1 000 ℃ and 1 200 ℃ respectively, and the effects of different temperatures on the properties of AlCoCrFeNi_2.1 eutectic high entropy alloy were revealed by mechanical properties, X-ray diffraction, microstructure analysis and other related tests. The results show that after rolling, the tensile strength and elongation are both improved. The tensile strength and elongation of the specimen with the rolling temperature of 800 ℃ reached 1 475 MPa and 20.4%, which was the best and can surpass 46.8% and 32.5% than that of the as-cast alloy respectively. While the improvement for the specimen with rolling temperature of 1 000 ℃ was the weakest. The change of hardness for the specimens with three rolling temperatures was consistent with that of tensile strength. The hardness of the specimen with the rolling temperature of 800 ℃ reached the maximum value of 427HV, which was 37.7% higher than that of the as-cast specimen. For the specimens with the rolling temperature of 800 ℃ and 1 000 ℃, white granular precipitates were precipitated in the body-centered cubic matrix in the normal surface of vertical rolling, and the particle size obviously increased at 1 000 ℃. In the transverse direction of vertical rolling, for the specimens with the rolling temperature of 1 000 ℃ and 1 200 ℃, rod-shaped and spherical precipitates were found on the face-centered cubic matrix, in which the spherical precipitates had the same composition and microstructure as the body-centered cubic matrix.

Key words： high entropy alloy hot rolling temperature microstructure performance

Published: 25 August 2023 Online: 2023-08-14

CLC number:

TG139

Fund:National Natural Science Foundation of China (52175325,51761027).

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	ZHOU Zhenzhen
	WANG Zuojin
	JIAO Shishun
	CAO Rui

Cite this article:

ZHOU Zhenzhen,WANG Zuojin,JIAO Shishun, et al. Effects of Different Rolling Temperatures on Microstructure and Properties of AlCoCrFeNi_2.1 Eutectic High Entropy Alloy[J]. Materials Reports, 2023, 37(16): 21120021-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21120021 OR http://www.mater-rep.com/EN/Y2023/V37/I16/21120021

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