Radiation-Induced Grain Growth of Nanocrystalline AlxCoCrFeNi High-Entropy Alloys

Jianren Zhou,Fengyuan Lu,Shengmin Guo,Md Imdadul Islam,Yi Zhang

doi:10.1021/acs.jpcc.0c09061

Abstract

Grain growth of nanocrystalline AlxCoCrFeNi high-entropy alloys with varying Al contents (x = 0, 1, 2) is studied. The alloys are fabricated by high-energy ball milling and subjected to a 1 MeV Kr2...

Highlights

High-entropy alloys (HEAs) are composed of four or more metallic elements mixed in an equimolar or near-equimolar ratio to form a solid solution.[1,2] HEAs exhibit good properties, including high elevated-temperature strength,[3,4] low-temperature toughness,[5] excellent wear,[6,7] as well as corrosion[8,9] and oxidation resistance,[10] which showed the possibility of being structural materials[11−16] for nuclear reactors
Nanocrystalline AlxCoCrFeNi high-entropy alloys with different Al contents (x = 0, 1, 2) were synthesized by high-energy ball milling at room temperature
A notable grain growth was observed under a 1 MeV Kr2+ ion irradiation, which grain size increases with irradiation dose from 13.8 ± 3, 7.4 ± 1, and 11 ± 1 nm before irradiation to 36 ± 8, 25 ± 5, and 26.6 ± 3 nm at an irradiation dose of 5.625 dpa for Al-0, Al-1, and Al-2 alloys, respectively, and whose kinetics was elucidated by the thermal spike model

Summary

INTRODUCTION

High-entropy alloys (HEAs) are composed of four or more metallic elements mixed in an equimolar or near-equimolar ratio to form a solid solution.[1,2] HEAs exhibit good properties, including high elevated-temperature strength,[3,4] low-temperature toughness,[5] excellent wear,[6,7] as well as corrosion[8,9] and oxidation resistance,[10] which showed the possibility of being structural materials[11−16] for nuclear reactors. Voids were not observed for FeNiMnCr HEA32 the irradiation dose reached up to 10 dpa, and a lower volume swelling of AlxCoCrFeNi HEAs19 was revealed compared to conventional structural materials under similar irradiation conditions. These encouraging results make HEAs very attractive for use as nuclear materials. A study of nanocrystalline oxides[55] showed a disorder-driven growth process of grain size as a result of the high disorder density near grain boundaries upon ion irradiation. The mechanisms behind the grain growth behaviors of these particular types of alloys were proposed

EXPERIMENTAL DETAILS

RESULTS AND DISCUSSION

CONCLUSIONS

■ ACKNOWLEDGMENTS

■ REFERENCES