Exceptional Strain-Hardening Capacity of a Medium-Entropy Alloy CoCrNi With Grain-Size Gradient Structure

Wei, Pengbo1,2; Yan, Kai1; Xu, Jiao1,3; Ren, Fuzeng1

2023-02-01

10.1007/s11661-023-06988-z

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   影响因子和分区

1073-5623

1543-1940

Surface mechanical attrition treatment (SMAT) was used to produce a surface layer with grain-size gradient along the thickness of spark-plasma-sintered medium-entropy alloy CoCrNi. In comparison with the spark-plasma-sintered fine-grained CoCrNi, the alloy after SMAT shows a 46 pct increase in yield strength and over three times higher strain-hardening rate ((d sigma)/(d epsilon)). The ultimate tensile strength (sigma(UTS)) and the elongation (epsilon(f)) reach 1420 MPa and 61.3 pct, respectively. The excellent strength-ductility synergy should be attributed to the Hall-Petch strengthening and the formation of high density of dislocations and nanotwins.

SCI ; EI

英语

第一 ; 通讯

Shenzhen Fundamental Research Project[JCJY20190809153205492] ; National Natural Science Foundation of China[52122102]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000949169600003

SPRINGER

20230813618763

Chromium alloys ; Entropy ; Grain size and shape ; High-entropy alloys ; Sintering ; Strain hardening ; Strain rate ; Tensile strength ; Ternary alloys

Metallurgy and Metallography:531 ; Heat Treatment Processes:537.1 ; Chromium and Alloys:543.1 ; Iron Alloys:545.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Clear Water Bay, Hong Kong, Peoples R China
3.Shenzhen Univ, Inst Semicond Mfg Res, Shenzhen 518060, Guangdong, Peoples R China

Wei, Pengbo,Yan, Kai,Xu, Jiao,et al. Exceptional Strain-Hardening Capacity of a Medium-Entropy Alloy CoCrNi With Grain-Size Gradient Structure[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2023,54(4):1332-1341.

Wei, Pengbo,Yan, Kai,Xu, Jiao,&Ren, Fuzeng.(2023).Exceptional Strain-Hardening Capacity of a Medium-Entropy Alloy CoCrNi With Grain-Size Gradient Structure.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,54(4),1332-1341.

Wei, Pengbo,et al."Exceptional Strain-Hardening Capacity of a Medium-Entropy Alloy CoCrNi With Grain-Size Gradient Structure".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 54.4(2023):1332-1341.