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Vol.47, No.4, 223 ~ 228, 2009
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| Title |
| The Optimal Solution Treatment Condition in a Al-Si-Cu AC2B Alloy |
| 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 |
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| 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℃. |
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| Key Words |
| Al-Si-Cu AC2B alloy, θ-(Al2Cu), solution treatment, precipitation, aging |
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