Effect of Sc microalloying on fabrication, microstructure and mechanical properties of SiCp/Al-Cu-Mg-Sc composites via powder metallurgy

被引：16

作者：

Cai, Yunpeng ^{[1
]}

Su, Yishi ^{[1
]}

Liu, Kan ^{[1
]}

Hua, Andong ^{[1
]}

Wang, Xiaozhen ^{[1
]}

Cao, He ^{[1
]}

Zhang, Di ^{[1
]}

Ouyang, Qiubao ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 877卷

基金：

中国国家自然科学基金;

关键词：

Aluminum matrix composites; Scandium; Microalloying effect; Mechanical properties; MATRIX COMPOSITES; DUCTILE FRACTURE; ALUMINUM; PRECIPITATION; ALLOYS; PARTICLES; SCANDIUM; EVOLUTION; KINETICS;

D O I：

10.1016/j.msea.2023.145152

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Overcoming the strength and ductility trade-off is a long-lasting research theme in aluminum matrix composites. Here, we present a strategy to promote strength-ductility synergy in aluminum matrix composites by utilizing the microalloying effect of Sc. 15 wt% SiCp/Al-Cu-Mg-Sc composites with varying Sc content were fabricated by high energy ball milling, hot pressure sintering and hot extrusion. With 0.2 wt% Sc addition, the SiCp/Al-Cu-MgSc composite exhibits a yield strength of 600.6 MPa, an ultimate tensile strength of 681 MPa and a fracture elongation of 4.3%, achieving simultaneous enhancement in strength and ductility compared with the Sc-free counterpart. Particularly, the fracture elongation remarkably increased by 126% which originates from the reduction of stress concentration caused by the refinement of intergranular & theta; phase and the improvement of dislocation accumulation capability caused by the formation of intragranular & theta;' phase. Our work provides an accessible pathway consistent of high energy ball milling and microalloying of Sc to exploit aluminum matrix composites with advanced strength-ductility balance.

引用

页数：9

共 44 条

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