Research Progress of Strategies for Improving Strength-ductility Combinations and Mechanical Properties of High Entropy Alloys
WANG Weitong1, CHEN Shuying2, ZHANG Yong1, ZHAO Yonghao3
1 School of Materials Science and Engineering, Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China 2 Institute for Advanced Studies in Precision Materials, Yantai University, Yantai 264005, China 3 School of Materials Science and Engineering, Nano and Heterogeneous Materials Center, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract: Since the high entropy alloy has been reported for the first time, its excellent mechanical properties have attracted wide attention from all over the world. The superior strength, high hardness, good resistance to wear and corrosion of the high entropy alloy and its excellent service ability at extreme temperatures illustrate that the high entropy alloy has great potential in industrial applications in the future. With the increasing investigation of high entropy alloys, from the variation of elemental types, and the proportion of principal elements, the optimization and development of mechanical properties of high entropy alloys are accompanied by structural changes. Nevertheless, the mechanical properties of high entropy alloys still have much room for improvement. Therefore, how to rationally design the composition and microstructure and enhance the mechanical properties of high entropy alloys is a hot topic at present. In high entropy alloys, the existing strengthening and toughening methods include fine-grained strengthening, solid solution strengthening and toughening, eutectic structure strengthening and toughening, TWIP (twinning induced plasticity) effect strengthening and toughening, TRIP (transformation induced plasticity) effect strengthening and toughening, and precipitate strengthening and toughening. Fine-grained strengthening and precipitate strengthening exist in most high entropy alloys and it is easy to achieve by thermomechanical treatment. Therefore, how to establish the correlation between the strengthening mechanisms, microstructural characteristics and mechanical properties is a critical issue at present. In present paper, the research progress of strengthening and toughening methods in high entropy alloys is summarized, and the design concepts of solid solution strengthening, SRO (short-range ordering) strengthening, precipitate strengthening and heterogeneous strengthening and toughening were introduced as well. We also discuss the effect of various special structures on the deformation mechanism and mechanical pro-perties of high entropy alloy. The problems and development prospects of the high entropy alloy in the research process are also analyzed, in order to provide important reference for the subsequent establishment of effective connection between the microstructural characteristics and the mechanical properties.
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