Effect of Si, Cu and Fe on mechanical properties of cast semi-solid 206 alloys

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 9; pp. 1555 - 1560
• Main Authors: LEMIEUX, A., LANGLAIS, J., BOUCHARD, D., GRANT CHEN, X.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2010; Rio Tinto Alcan, Arvida Research and Development Centre, Jonquière, QC, G7S 4K8, Canada%Rio Tinto Alcan, Laterrière Works, Laterrière, QC, G7N 1A2, Canada%NRC-Aluminium Technology Centre, Chicoutimi, QC, G7H 8C3, Canada%Université du Québec à Chicoutimi, Chicoutimi, QC, G7H 2B1, Canada
• Subjects: 206 aluminum alloy; hot tearing; mechanical properties; SEED process; semi-solid forming; 力学性能; 半固态合金; 半固态成形; 热裂敏感性; 铁含量; SEED process; semi-solid forming; 206 aluminum alloy; hot tearing; mechanical properties
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60338-1

The development of a modified 206 alloy whose composition was optimized to minimize hot tearing during semi-solid forming was reported. The effect of varying silicon, copper and iron contents was investigated using a design of experiment （DOE） approach. Semi-solid slurries were prepared using the SEED process and injected into a high pressure die casting press. The hot tearing sensitivity results were reported for different alloy variants. The microstructure evolution during the semi-solid preparation was presented along with actual die cast components. The effects of silicon, copper and iron on mechanical properties in the T7 condition were also analyzed. Beyond the benefit of reducing hot tearing, it is shown that the tensile and fatigue properties remain compatible with the automotive industry requirements.