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| Effect of Mn on the Microstructure and Mechanical Properties of CrMnₓFeNi High-entropy Alloys |
| WANG Zun-guang，ZHANG Yi-hang，GAO Yu-zhen，YU Bin，CHENG Yan-yan*
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| College of Mechanical and Electrical Engineering, Jilin University of Chemical Technology, Jilin City, Jilin Provice 132022 |
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Abstract By preparing CrMn?FeNi high-entropy alloys with different Mn contents, CrMn?FeNi (x = 0.5, 1.0, 1.5, 2.0) high-entropy alloys were studied, and the effects of Mn content on the crystal structure and mechanical properties were explored. The results show that the CrMn?.?FeNi high-entropy alloy has a single-phase FCC structure, while CrMnFeNi, CrMn?.?FeNi, and CrMn?.?FeNi have a two-phase FCC + BCC structure. With the gradual increase of Mn content, lattice distortion occurs inside the alloy, which in turn triggers a phase transformation. An increasing amount of Mn elements accumulates at the grain boundaries, forming a BCC phase with a certain dendritic morphology. This structural change, by introducing and increasing the hard BCC second phase, results in a strengthening effect dominated by second-phase reinforcement. Simultaneously, the lattice distortion stress field induced by Mn atoms dissolving into the matrix increases the resistance to dislocation motion, providing an additional contribution to solid solution strengthening. Together, these mechanisms collectively lead to a continuous increase in the hardness of the CrMnxFeNi high-entropy alloy.
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Published: 13 March 2026
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