Al-Si-Cu계 AC2B 합금의 최적 용체화 처리 조건

• Published in: 대한금속·재료학회지, 47(4) pp. 223 - 227
• Main Authors: 정재길, 박준수, 이영국, 전중환, 강희삼, 하양수, 임종대
• Format: Journal Article
• Language: Korean
• Published: 대한금속·재료학회 01.05.2009
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241

The precipitates, hardness, and tensile properties of Al-6.2Si-2.9Cu AC2B alloy were investigated with respect to solution treatment time at 500˚C. 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˚C, 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˚ C exhibit almost the same tensile properties even after aging at 250˚C 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˚C. KCI Citation Count: 8