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Study of microstructural evolution and phase's morphology after partial remelting in A356 alloy
Mahdavi, A ; Sharif University of Technology | 2008
435
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- Type of Document: Article
- DOI: 10.4028/www.scientific.net/ssp.141-143.367
- Publisher: Trans Tech Publications Ltd , 2008
- Abstract:
- In this work, effective parameters of SIMA process to obtain non dendritic microstructure in A356 alloy were investigated. In addition, the effect of SIMA process on the evolution of morphology of silicon and intermetallic phases in this alloy was studied. Microstructure images obtained from optical microscopy and SEM observation showed that increase in plastic work up to 40% and then holding of samples in the semi solid state at temperature of 580°C, causes that primary dendritic structure changes to non dendritic, fine and globular structure, but optimum reheating time completely depended on initial thickness of samples. If all parameters of SIMA process are the same, the grain boundaries of thinner samples begin to wet and following globalization will be completed in shorter reheating time rather than thicker ones. Moreover, it was found that the intermetallic phases lost their angular or needle morphology and gradually changed to rounded morphology and even to globular form. Also the optimum reheating time thoroughly depends on primary casting microstructure as the finer casting microstructure begin to globalize faster than thicker one under more little stains
- Keywords:
- Grain boundaries ; Industrial heating ; Intermetallics ; Microstructural evolution ; Structural optimization ; A356 ; Dendritic structures ; Effective parameters ; Evolution of morphologies ; Intermetallic phasis ; Micro-structure evolutions ; Non-dendritic microstructure ; SIMA parameters ; Morphology
- Source: Semi-Solid Processing of Alloys and Composites 10 - Selected, peer reviewed papers from the 10th International Conference on Semi-Solid Processing of Alloy and Composites, S2P 2008, Aachen, 16 September 2008 through 18 September 2008 ; Volume 141-143 , 2008 , Pages 367-372 ; 10120394 (ISSN); 9771012039401 (ISBN)
- URL: https://www.scientific.net/SSP.141-143.367