Phase Stability of L21 in Al-Cr-Fe-Mn-Ni High Entropy Alloys and Properties Study
YI Hui1, WU Changjun1,2,*, ZHOU Chen1, LIU Ya1, LU Xiaowang3, SU Xuping1,2
1 Jiangsu Key Laboratory of Materials Surface Science and Technology, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China 2 Jiangsu Collaborative InnovationCenter of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China 3 School of Material Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China
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 Al0.5Cr2.5-xFeMnxNi (x=0.5—1.75), Al0.75Cr2.25-yFeMnyNi (y=0.25—1.5) and AlCr2-zFeMnz 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.
通讯作者:
*吴长军,常州大学材料科学与工程学院教授、硕士研究生导师。2006年湘潭大学金属材料工程专业本科毕业,2011年湘潭大学材料学专业博士毕业。2015—2016年在韩国浦项科技大学进行博士后研究工作。目前主要从事高性能金属材料、高熵合金、合金相图及材料设计、材料表面处理等方面的研究工作。获国家发明专利授权20余项,发表论文80余篇,包括Journal of Alloys and Compounds、Transactions of Nonferrous Metals Society of China、CALPHAD、Vacuum等。wucj@cczu.edu.cn
易慧, 吴长军, 周琛, 刘亚, 陆晓旺, 苏旭平. Al-Cr-Fe-Mn-Ni高熵合金中的L21相的相稳定性及其性能研究[J]. 材料导报, 2024, 38(11): 23010014-9.
YI Hui, WU Changjun, ZHOU Chen, LIU Ya, LU Xiaowang, SU Xuping. Phase Stability of L21 in Al-Cr-Fe-Mn-Ni High Entropy Alloys and Properties Study. Materials Reports, 2024, 38(11): 23010014-9.
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2024, Vol. 38 
