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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/13063

Title: Metallurgical parameters controlling the microstructure and hardness of Al-Si-Cu-Mg base alloys
Authors: Ibrahim, M.F
Samuel, E
Samuel, A.M.
Al-Ahmari, A.M.A.
Samuel, F.H.
Keywords: A. Non-ferrous metals and alloys; E. Mechanical; F. Microstructure
Issue Date: 2000
Publisher: Elsevier
Citation: Materials and Design, (In Press)
Abstract: Castings were prepared from both experimental and industrial 319 alloy melts containing 0-0.6 wt% Mg. Test bars were cast in two different cooling rate molds, a star-like permanent mold and an L-shaped permanent mold, with DASs of 24 μm and 50 μm, respectively. The bars were tempered at 180 °C (T6 treatment) and 220 °C (T7 treatment) for 2-48 h. The results showed that Mg content, aging conditions, and cooling rate have a significant effect on the microstructure of both experimental and industrial alloys and, consequently, on the hardness. The addition of Mg resulted in the precipitation of the β-Mg2Si, Q-Al5Mg8Cu2Si6, π-Al8Mg3FeSi6 and of the block-like θ-Al2Cu phases. The Mg and Cu, as well as the higher cooling rates improved the hardness values, especially in the T6 heat-treated condition, whereas the addition of Sr decreased these values.
URI: http://hdl.handle.net/123456789/13063
ISSN: 02613069
Appears in Collections:College of Engineering

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