Rheological study of 356 Al-Si foundry alloy prepared by a new innovative SSM process
Date
2005
Authors
Lashkari, O.
Ghomashchi, R.
Adjersch, F.
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Conference paper
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EPD Congress 2005 : proceedings of sessions and symposia, held during the 2005 TMS Annual Meeting in San Francisco, California, USA, February 13-17, 2005 / M. E. Schlesinger (ed.): pp.149-156
Statement of Responsibility
O. Lashkari, R. Ghomashchi, and F. Adjersch
Conference Name
EPD Congress (16th : 2005 : San Francisco, Calif.)
Abstract
SEED (Swirled Enthalpy Equilibration Device) is established itself as a new technology amongst the many Semi-Solid Metal (SSM) processes, where swirling of the mush plays an important role in modifying the dendritic structure of as-cast parts. A range of semi solid metal structures, dendritic, rosette and/or globular morphology of primary phase, can be prepared using SEED. The current article reports on the application of rheological tests in characterizing microstructural evolution during SSM processing of 356 Al-Si foundry alloy. A simple parallel plate test machine, designed and constructed at our labs, was used to determine viscosity values for each structure and identify the optimum structure with superior die filling characteristics. Such findings have important technological and economical implications during high pressure die casting of semi- solid metals. The strain-time graphs for 356 Al-Si foundry alloy indicated lower viscosity values for globular microstructure, i.e. improved die filling.
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