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Korean Journal of Metals and Materials > Volume 55(12); 2017 > Article
Korean Journal of Metals and Materials 2017;55(12): 888-895. doi: https://doi.org/10.3365/KJMM.2017.55.12.888
Al-5.2Si-3.4Cu-0.28Mg 합금의 미세조직 및 기계적 특성에 미치는 용체화 및 시효 열처리의 영향
조의제, 정제기, 박용호
부산대학교 재료공학과
Effects of Solution and Aging Treatments on the Microstructure and Mechanical Properties of Al-5.2Si-3.4Cu-0.28Mg Alloy
Yi Je Cho, Jeki Jung, Yong Ho Park
Department of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
Correspondence  Yong Ho Park ,Tel: +82-51-510-3967, Email: yhpark@pusan.ac.kr
Received: 5 July 2017;  Accepted: 18 September 2017.  Published online: 4 December 2017.
ABSTRACT
Since strength and ductility have a trade-off relationship in Al alloys, controlling these properties using heat treatments requires careful attention to the dissolution and evolution of the reinforcing phases. In this study, the effects of solution and aging treatments on the microstructure and mechanical properties of Al-5.2Si-3.4Cu-0.28Mg alloy were investigated. 1-step and 2-step solution treatments were conducted at 495 and 520 ℃ with various holding times, which were determined by thermal analysis. At 495 ℃, the eutectic θ(Al2Cu) phases were quickly dissolved while block-shaped θ phases remained, even until 13 hours. During the 2-step treatment at 520 ℃, these remaining phases were melted both in the grains and boundaries. Although all of the Q(Al5Cu2Mg8Si6) phases were completely dissolved in the 2-step treatment, the hardness of the 2-step treated specimen was lower than the 1-step treated one. After solution treatments at 495 ℃/9 hours, where the highest hardness was observed, artificial aging treatments were conducted at 160 and 200 ℃ with various times. Yield and ultimate tensile strengths showed similar values at the peak aging regardless of the temperature, while higher hardness (117%) and elongation (281%) were obtained at 160 than 200 ℃. Based on the observed results, the correlations between the microstructures and mechanical properties by the heat treatments were investigated.
Keywords: Al alloy, solution treatment, aging, microstructure, mechanical properties
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