| Title |
The Optimal Solution Treatment Condition in a Al-Si-Cu AC2B Alloy |
| Authors |
정재길(Jae Gil Jung); 박준수(June Soo Park); 하양수(Yang Soo Ha); 이영국(Young Kook Lee); 전중환(Joong Hwan Jun); 강희삼(Hee Sam Kang); 임종대(Jong Dae Lim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Al-Si-Cu AC2B alloy; θ-(Al2Cu); solution treatment; precipitation; aging |
| Abstract |
The precipitates, hardness, and tensile properties of Al-6.2Si-2.9Cu AC2B alloy were investigated with respect to solution treatment time at 500℃. Al(Cu)-Al2Cu eutectic, Si, θ-(Al2Cu), and Q-(Al5Cu2Mg8Si6) phases were observed in the as-cast specimen. With increasing the solution treatment time at 500℃, the Al(Cu)-Al2Cu eutectic and θ-(Al2Cu) phases were gradually reduced and finally almost disappeared in 5 h. The mechanical properties, such as hardness, tensile strength, and elongation, were improved with solution treatment time until about 5 h due to the dissolution of the Al2Cu particles. With further holding time, the mechanical properties did not change much. The solution treated specimens for over 5 h at 500℃ exhibit almost the same tensile properties even after aging at 250℃ for 3.5 h. Accordingly, the optimal solution treatment condition of the Al-Si-Cu AC2B alloy is considered to be 5 h at 500℃. |