Semisolid microstructural evolution of AlSi7Mg during partial remelting

Wang, Hao and Davidson, C. J. and StJohn, David H. (2004) Semisolid microstructural evolution of AlSi7Mg during partial remelting. Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing , 368 (1-2). pp. 159-167. ISSN 0921-5093

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Abstract

Different as-cast microstructures of an AlSi7Mg alloy were produced by controlling the solidification conditions. The as-cast grain size ranged from 1.4 mm to 160 μm and the morphology varied from dendritic to rosette-like to globular. The as-cast materials were then partially remelted and isothermally held at 580 °C for microstructure evolution. The final microstructure depended on the initial as-cast microstructure and the isothermal holding time. After partial remelting and isothermal holding, coarse-grained dendritic structures were not able to evolve to a globular structure, while structures with medium sized dendritic grains evolved to a globular structure with a relatively large particle size after a long isothermal holding time. Fine-grained structures evolved to well-rounded globular grains within times ranging from 10 min to 5 min as the dendritic nature of the starting structure diminished. An empirical equation has been established to describe the relationship between the evolved microstructure and the as-cast microstructure.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version deposited in accordance with the copyright policy of the publisher.
Depositing User: Dr Hao Wang
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 25 Oct 2007 22:37
Last Modified: 02 Jul 2013 22:49
Uncontrolled Keywords: semisolid, microstructural evolution, thixotropic feedstock, AlSi7Mgn, alloy
Fields of Research (FOR2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry of Materials
09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
Identification Number or DOI: doi: 10.1016/j.msea.2003.10.305
URI: http://eprints.usq.edu.au/id/eprint/3064

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