High-entropy alloys(HEAs)as novel metallic materials are composed of five or more major elements,and those traditionally scientific problem of strength-ductility trade-off still needs to be urgently solved.Laser shock peening(LSP)provides an effective strategy to overcoming the scientific problem of HEAs,through constructing strengthening-toughening gradient microstructure.In this paper,the characteristics of LSP process are described,and the microstructure characteristics of high-entropy alloys induced by LSP,such as grain gradient,dislocation gradient and phase transformation gradient,are analyzed.The formation mechanism and strengthening mechanism of gradient microstructure are summarized,and the future development of LSP high-entropy alloys is prospected.
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