Effect of thermo-mechanical treatment and strontium addition on workability and mechanical properties of Al-Si-Cu casting alloy

被引：7
作者：
Lee, Yun-Soo [1 ,2 ]
Jung, Je-Ki [1 ,3 ]
Kim, Soo-Bae [1 ]
Kim, Su-Hyeon [1 ]
Lim, Cha-Yong [1 ]
Kim, Hyoung-Wook [1 ]
Kim, Won-Kyoung [1 ]
Hyun, Soong-Keun [2 ]
机构：
[1] Korea Inst Mat Sci, Metall Mat Div, Chang Won 51508, South Korea
[2] Inha Univ, Dept Mat Sci & Engn, Incheon 22212, South Korea
[3] Pusan Natl Univ, Dept Mat Sci & Engn, Busan 46241, South Korea
来源：
MATERIALS CHARACTERIZATION | 2021年 / 178卷
关键词：
Aluminum alloy; Particle modification; Workability; Microstructure; Mechanical properties; HOMOGENIZATION DEFORMATION TREATMENT; HEAT-TREATMENT; MICROSTRUCTURAL EVOLUTION; HARDENING RESPONSE; ALUMINUM-ALLOYS; SR; BEHAVIOR; PHASE; SOLIDIFICATION; TOUGHNESS;
D O I：
10.1016/j.matchar.2021.111256
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, the potential application of Al-Si-Cu aluminum alloy (ALDC12), which is widely used in the highpressure die-casting (HPDC) process, for fabricating a wrought product was evaluated. The effects of thermomechanical treatment and Sr addition on the microstructure, workability, and mechanical properties of the ALDC12 alloy were investigated in detail. The introduction of thermo-mechanical treatment significantly reduced the interconnectivity of the brittle eutectic Si phase formed during solidification and average grain size. Therefore, the uniformly distributed spherical Si particles and fine grain size considerably improved both the strength and ductility of the ALDC12 alloy. Furthermore, the addition of Sr effectively modified the eutectic Si phase in the casting process, which significantly reduced the occurrence of edge cracks in the subsequent rolling step and further improved the mechanical properties of the final sheets. Consequently, through microstructural control of the ALDC12 aluminum alloy by the thermo-mechanical treatment and Sr addition, it was possible to obtain suitable workability and significantly improved mechanical properties compared with those of cast products.
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页数：13
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