The precipitation behaviours and strengthening mechanism of a Cu-0.4 wt% Sc alloy

作     者：Zifan Hao Guoliang Xie Xinhua Liu Qing Tan Rui Wang Zifan Hao;Guoliang Xie;Xinhua Liu;Qing Tan;Rui Wang

作者机构：State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China Key Laboratory for Advanced Materials Processing of Ministry of EducationInstitute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Beijing Laboratory of Metallic Materials and Processing for Modern TransportationUniversity of Science and Technology BeijingBeijing100083China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第98卷第3期

页      面：1-13页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the Fundamental Research Funds for the Central Universities(No.FRF-IDRY-19-012) the National Natural Science Foundation for Distinguished Young Scholars of China(No.51925401) 

主　　题：Cu-Sc alloy Precipitation Aging process Strengthening mechanism 

摘      要：The precipitation behaviours during the aging process and the corresponding strengthening mechanism of a Cu-0.4 wt%Sc alloy were systematically investigated in this *** phase transformation sequence of the precipitation in the aging process of the Cu-0.4 wt%Sc alloy was found to be:supersaturated solid solution→Sc-enriched atomic clusters→metastable phase→Cu4Sc *** tetragonal structured lamellar Cu4Sc precipitates,with a habit plane parallel to the{111}plane of the Cu matrix and orientation relationships of(022)_(α)//(211)_(Cu4Sc)and[011]_(α)//[113]_(Cu4Sc),are found homogeneously distributed in the matrix.A combined process of cryogenic rolling(CR)and aging was designed for optimization of the mechanical and electrical *** integration of yield strength(696 MPa)and electrical conductivity(62.8%IACS)of this alloy was achieved by cryogenic rolling and subsequent aging process at 400℃for 4 *** significant precipitation strengthening effect of this alloy is attributed to the Cu4Sc precipitates with an extremely small size of only 1.5–3 *** leading strengthening mechanism is considered as the superposition of both coherent strengthening and Orowan strengthening effects.