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Title: | Constitutional undercooling and growth of globuletic particle |
Authors: | Nyamannavar, S. Ravi, M. Prabhu, K.N. |
Issue Date: | 2008 |
Citation: | 68th World Foundry Congress 2008, WFC 2008, 2008, Vol., , pp.559-562 |
Abstract: | Isothermal holding of an alloy at semi-solid temperature and quenching/cooling, results in formation of instabilities on the globuletic ?-particles. The aspect of instability formation is necessary input for accurate simulation and modeling of microstructure evolution for semi-solid metal forming (SSM) process. In the present work instability formation is studied for Al-7Si-0.3Mg alloy. Small cylindrical samples (10 mm, height 10 mm) were subjected to isothermal holding at semisolid temperature followed by quenching/cooling to room temperature. Instabilities were found to form at cooling rates 30 and 100 K/s. Instability formation is explained by interface stabilization theory based on the constitutional undercooling of liquid ahead of the solid/liquid interface. |
URI: | http://idr.nitk.ac.in/jspui/handle/123456789/7541 |
Appears in Collections: | 2. Conference Papers |
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