Al-Cr-Fe-Mn-Ni高熵合金中的L2<sub>1</sub>相的相稳定性及其性能研究

doi:10.11896/cldb.23010014

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Abstract To obtain the BCC-based high entropy alloys with good combination of strength and plasticity, introducing the coherent precipitation B2 or L2₁ phase into the matrix has become a research hotspot. The creep resistance of L2₁ phase at high temperature is better than B2 phase, which is expected to be used in high temperature environment. However, the existence rule of L2₁ phase in BCC high entropy alloy, phase stability and its effect on the properties of the alloy was still lacking. Therefore, in the present work, series of Al_0.5Cr_2.5-xFeMn_xNi (x=0.5—1.75), Al_0.75Cr_2.25-yFeMn_yNi (y=0.25—1.5) and AlCr_2-zFeMn_z Ni (z=0.5—1.5) alloys were prepared by vacuum arc melting method. The effect of annealing at 800 ℃ or 1 000 ℃ for 120 h on the microstructure and phase composition of the alloys were investigated. The composition characte-ristics of the L2₁phase in these alloys are detected to be 40at%—50at% Ni, 15at%—20at% Al and Mn. BSE-EDS, XRD and TEM results show that L2₁ phase forms only when the alloys contain 10at%—15at% Al, and the alloy is mostly composed of BCC+L2₁ two phases. The BCC and L2₁ phases microstructure exhibits a weave-like spinodal decomposition. When Al content reaches 20at%, the alloy is composed of two phases of BCC+B2. Due to the existence of L2₁ phase, there is a obvious peak splitting in XRD pattern. After being annealed at 800 ℃ or 1 000 ℃, the L2₁ phase still stably exists, and the microstructure of the alloy coarsened and the σ or FCC phase formed. It is found that the hardness of as-cast alloys decreases with the increase of Mn content, and the hardness of alloy containing L2₁ phase is in the range of 463HV—558HV. Annealing at 800 ℃ reduces the hardness of alloy with 5at%—15at%Mn by 70HV—100HV, but increases the hardness of alloy with 20at%—30at% Mn by more than 200HV, due to the precipitation of hard σ phase. After annealing at 1 000 ℃, the hardness of the alloy decreases slightly due to the formation of soft FCC phase. These results will lay a foundation for the design of BCC high entropy alloys.

Key words： Al-Cr-Fe-Mn-Ni high entropy alloys L2₁ phase hardness phase stability

Published: Online: 2024-06-25

CLC number:

TG113.12

Fund:National Natural Science Foundation of China (51771035, 52271005).

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	YI Hui
	WU Changjun
	ZHOU Chen
	LIU Ya
	LU Xiaowang
	SU Xuping

Cite this article:

YI Hui,WU Changjun,ZHOU Chen, et al. Phase Stability of L2₁ in Al-Cr-Fe-Mn-Ni High Entropy Alloys and Properties Study[J]. Materials Reports, 2024, 38(11): 23010014-9.

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http://www.mater-rep.com/EN/10.11896/cldb.23010014 OR http://www.mater-rep.com/EN/Y2024/V38/I11/23010014

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