Effect of TiC nano-particles on the mechanical properties of an Al-5Cu alloy after various heat treatments

[摘要] In this paper, the effects of TiC nano-particles on the mechanical properties of Al-5Cu alloy were investigated. Adding TiC nano-particles can effectively refine grain size and secondary dendritic arm. The ultimate tensile strength, yield strength and elongation of the Al-5Cu alloy in each of the three states (i.e. as-cast, solid-solution state and T6 state) were also improved by adding TiC nano-particles. Moreover, the elastic-plastic plane-strain fracture toughness (K J) and work of fracture ( wof) of Al-5Cu containing TiC were significantly higher than those of Al-5Cu without TiC after aging for 10 h. The addition of TiC nano-particles also led to finer and denser ′ precipitates.

[发布机构] Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun; 130025, China^1

[关键词] Elastic-Plastic;Grain size;Plane strain fracture toughness;Solid-solution state;Strength and elongations;Three state;Ultimate tensile strength;Work of fracture