Progress in study of FeMnCoCr matestable high-entropy alloy toughening pathways and service performance under hydrogen environment at cryogenic temperature
FeMnCoCr metastable high-entropy alloys using martensite/twins as the main deformation mechanism have attracted much attention in the field of structural materials research due to their excellent comprehensive mechanical properties,they have great potential for application in the fields of hydrogen energy storage and transportation,energy-absorbing protection and deep space or sea,etc.In particular,the increase of complex service scenarios,for example deep cryogenic/hydrogen proximity,has put forward more stringent performance requirements for metallic structural materials.The gap/replacement strengthening of non-metallic elements is the main mean to further improve the mechanical properties of this system.The martensitic phase transformation-induced plastic deformation mechanism and multiple complex interfacial structures bring the possibility of expanding its service in cryogenic/hydrogen-critical environments.This review focuses on the latest research progress on the microstructure,fine structure and mechanical properties.Firstly,it outlines the development of FeMnCoCr metastable high-entropy alloys in recent years,and summarizes several types of commonly used non-metallic elements interstitial/replacement metastable high-entropy alloys regulation methods and strengthening mechanisms,then summarizes the influence mechanism of FeMnCoCr metastable high-entropy alloys in the low-temperature/hydrogen-critical service environments,and finally looks ahead to the future research direction and development trend of FeMnCoCr metastable high-entropy alloys.The research direction and development trend of FeMnCoCr metastable high-entropy alloys are also anticipated.
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