Effect of Heat Treatment on Microstructure and Mechanical Properties of A390 Alloy

Abstract:

In the present work, the effects of heat treatment on microstructure and mechanical properties of A390 alloy were investigated. The results show that the as-cast microstructure of A390 alloy mainly consists of primary silicon, α-Al, eutectic silicon and Al₂Cu phase. The morphology of primary silicon is irregular polygonal block with sharp edges. Eutectic silicon exhibits a coarse plate-like and acicular morphology and the fishbone like Al₂Cu phases are gathered at the grain boundary. During solution treatment, eutectic silicon undergoes fragmentation and spheroidization and T6 heat treatment has a profound effect on the dissolution of Cu and Mg. However, the morphology and size of primary silicon changes little. After the aging process, Al₂Cu phases are precipited as lamellar morphology. As a result, the mechanical properties the heat treated A390 alloy increases significantly after T6 treatment.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 1049-1053
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.1049
• Online since: January 2013
• Authors: Bao Li, Zhi Feng Zhang, Zhi Gang Wang, Jun Xu, Qiang Zhu
• Keywords: A390 Alloy, Heat Treatment, Mechanical Property, Microstructure

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