Abstract: High-entropy alloys have been proposed opening up a new way for the development of traditional alloys field. A polyatomic chemical long-range disorder of the simple crystal structure based on the unique alloy design concept is realized, rendering the high-entropy alloys have remarkable physicochemical properties. Usually, the strength and plasticity of metal structural materials are the trade-off relationship. The problem of strength and toughness that cannot be synergistic is an important factor that impedes the utilization of metal materials in harsh service environments, and also restricts a bottle-neck for the development of traditional metal materials. In recent years, important progress has been made in the study of strengthening-toughening of high-entropy alloys, and several kinds of high strength-toughness high-entropy alloys with different microstructure and deformation behavior have been reported. In this paper, the microstructure, mechanical properties, and deformation mechanism of several kinds of high strength-toughness high-entropy alloys are reviewed. The relationships among soft-hard phase interaction, nano-precipitated particles, heterostructure, chemical ‘order’, and deformation behavior of high-entropy alloys are discussed. Moreover, the future development trend of high strength-toughness high-entropy alloys have prospected.
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