文献类型：期刊文献

英文题名：Microstructural evolution and tensile property of gradient microstructure CoCrFeMnNi high-entropy alloy induced by pre-torsion

作者：Li, Xinfeng[1,5,6];Liu, Yang[1];Cui, Yan[2,3];Zhang, Jin[4];Fu, Jianxun[5,6]

机构：[1]Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Guangdong, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[4]Beijing Normal Univ, Coll Educ Future, Zhuhai 519087, Peoples R China;[5]Shanghai Univ, Ctr Adv Solidificat Technol, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China;[6]Shanghai Univ, Sch Mat Sci & Engn, State Key Lab Adv Special Steel, Shanghai 200444, Peoples R China

年份：2023

卷号：955

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20231714024736);WOS:【SCI-EXPANDED(收录号:WOS:000991138600001)】；

基金：The authors acknowledge support by State Key Laboratory of Advanced Metals and Materials (2021-Z02) , Open Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University (SKLASS 2021-08) and the Science and Technology Commission of Shanghai Municipality (No.19DZ2270200, 20511107700) , Major Engineering Materials Service Safety Research Evaluation Facility National Major Science and Technology Infrastructure Open Project Fund. Yan C. acknowledges the support by Shanghai Sailing Program (20YF1409600) and National Natural Science Foundation of China (Grant No. 52005184) . The authors also thanks Xingyu Liu, Yitong Zhang and Weiqi Cheng for conducting torsion tests, OM and hardness tests.

语种：英文

外文关键词：Magnetic levitation melting technology; High-entropy alloy; Pre-torsion; Gradient microstructure; TEM; Dislocation; twin strengthening

摘要：Gradient-structure was obtained in CoCrFeMnNi high-entropy alloys utilizing both the forward pre-torsion and forward-reverse pre-torsion preparation technique. The slope between hardness and r/R is high cor-responding to increase in the pre-torsion angles attributable to the gradient structure after pre-torsion processing. Under 2% tensile strain, the change of dislocation and twin morphology takes place as pre-torsion angle increases, i.e., from discrete dislocations, to dislocation tangles and to dislocation cells, and from single twins to secondary twins. According to tensile test results, yield strength of samples increases but fracture strain linearly decreases with increasing pre-torsion angles as: Yield strength = 905.47 11.67elongation. Yield strength of FRPTed specimens is slightly higher than that of FPTed specimens under the same pre-torsion angles with the maximum increment of 56 MPa. Strength mechanism indicates that the improvement of yield strength of the HEAs is mainly attributed to gradient dislocation and twin strengthening. In addition, a strength predictive model, which takes gradient dis-location and twin strengthening into consideration, is proposed, and predictive yield strength match well with the experimental data of FPTed-and FRPTed-samples.(c) 2023 Elsevier B.V. All rights reserved.