Fracture behavior and mechanical properties of high strength aluminum alloys in the as-cast condition

Finding a criterion for cold cracking during direct-chill (DC) casting of high-strength aluminum alloys seems to be quite necessary in aluminum industry. However, lack of experimental information on the fracture mode and temperature dependence of mechanical properties of such alloys in as-cast condi...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-12, Vol.497 (1), p.186-194
Main Authors: Lalpoor, M., Eskin, D.G., Katgerman, L.
Format: Article
Language:English
Subjects:
Aluminum alloys
Applied sciences
Cold cracking
DC-casting
Exact sciences and technology
Fracture
Fractures
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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Summary:Finding a criterion for cold cracking during direct-chill (DC) casting of high-strength aluminum alloys seems to be quite necessary in aluminum industry. However, lack of experimental information on the fracture mode and temperature dependence of mechanical properties of such alloys in as-cast conditions (without any homogenization or stress relieving) makes computer-simulation results unreliable. Mechanical tests on AA7050 and DC-cast A7475 revealed that these alloys lose their ductility sharply as the temperature falls and fail in inter/transdendritic mode. Formation of pores and micro-cracks especially at the matrix–intermetallics interfaces apparently results in brittleness of the material in the as-cast condition.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2008.06.047