中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 3 March 2026 |
（a National and Local Joint Engineering Research Center for Functional Materials Processing, School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
b Xinjiang Xiangrun New Materials Technology Co., Ltd., Hami 839000, China）
Abstract:A fine-grained metastable dual-phase Fe40Mn20Co20Cr15Si5 high entropy alloy (CS-HEA) with excellent strength and ductility was successfully prepared by friction stir processing (FSP). The microstructural and mechanical properties of the fine-grained CS-HEA were characterized. The results showed that as-cast shrinkage cavities and elemental segregation were eliminated. The average grain size was refined from 121.1 to 5.4 μm. The face-centered cubic phase fraction increased from 23% to 82%. During tensile deformation, dislocation slip dominated at strains ranging from 5% to 17%, followed by transformation induced plasticity (TRIP) from 17% to 26%, and twin induced plasticity (TWIP) from 26% to 37%. The yield strength, ultimate tensile strength, and elongation of the fine-grained CS-HEA were 503 MPa, 1120 MPa, and 37%, respectively. The strength-ductility synergy of fine-grained CS-HEA was attributed to the combined effects of TRIP, TWIP, dislocation strengthening, and fine-grained strengthening.
Key words: friction stir processing; metastable high entropy alloy; fine-grained microstructure; deformation behaviors; transformation-induced plasticity
