高熵合金强韧化方法及力学性能的研究进展

doi:10.11896/cldb.20080303

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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.

Key words： high entropy alloy heterogeneous microstructure mechanical property

Published: 26 September 2021

CLC number:

TG14

Fund:Ministry of Science and Technology of China (2017YFA0204403), the National Natural Science Foundation of China (51601091, 51971112), the Natural Science Foundation of Jiangsu Province (BK20160826), the Six Talent Peaks Project of Jiangsu Province (2017-XCL-051), and the Fundamental Research Funds for the Central Universities (30917011106, 30919011405).

About author:: Weitong Wangreceived his B.S. degree in materials science and engineering from Nanjing University of Science and Technology in 2019. Now he is a postgra-duate at school of materials science and engineering, Nanjing University of Science and Technology under the supervision of Prof. Yong Zhang.
Yong Zhang, professor of Nanjing University of Science and Technology, received his B. S. in Nanjing University of Science and Technology in 2004 and received his Ph.D. in institute of metal research, Chinese Academy of Sciences in 2010. He engaged in postdoctoral research in the Department of Mechanical Engineering, Johns Hopkins University from 2010 to 2013. From 2013 to 2015, he worked as a research scientist at the Department of Mechanical Engineering and theExtreme Materials Institute at Johns Hopkins University. He mainly engaged in the research on the mechanical properties of nanostructured materials, and research results have been published in journals such as Acta Materialia, Materials Research Letters, Materials Today, Scripta Materialia, Advanced Functional Materials, etc.

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Cite this article:

WANG Weitong,CHEN Shuying,ZHANG Yong, et al. Research Progress of Strategies for Improving Strength-ductility Combinations and Mechanical Properties of High Entropy Alloys[J]. Materials Reports, 2021, 35(17): 17043-17050.

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http://www.mater-rep.com/EN/10.11896/cldb.20080303 OR http://www.mater-rep.com/EN/Y2021/V35/I17/17043

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