The effects of cooling rate on the latent heat released mode for near pure aluminum and aluminum silicon alloys
- National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Materials Science and Engineering
The information concerning solid fraction with respect to temperature in the mush range is very important to the solidification models which employ the Effective Specific Heat method. The Computer Aided-Cooling Curve Analysis (CA-CCA) method is used in this study to measure the relationships between solid fraction (fs) and temperature/time for aluminum alloys of different composition under various cooling rates. Near pure aluminum, A356.2 and A390 alloys, are the concerned alloys in this study. The results of the measurements and analyses show that a rather long temperature range is observed near the end of solidification for near pure aluminum alloys. This mush range is longer as cooling rate gets higher. For A356.2 and A390 alloys, the solidus temperature, liquidus temperature, eutectic temperature, and maximum solid fraction at the eutectic temperature decrease as cooling rate increases. This is not true, however, for cooling rate higher than 9.5 C/second. It is also known that a functional form of fs with temperature is very convenient when it is applied to a solidification model. Two nonlinearity factors, n{sub e} and n{sub p}, are required to define the function. n{sub e} and n{sub p} are found to increase as cooling rate increases. The relationship between n{sub e} and n{sub p} and cooling rate can also be obtained. A reasonable estimation of the solid fraction data for the cooling rate not measured can then be made.
- OSTI ID:
- 227774
- Report Number(s):
- CONF-9509118-; ISBN 0-87339-297-3; TRN: IM9622%%51
- Resource Relation:
- Conference: 7. Conference on modeling of casting, welding and advanced solidification processes, London (United Kingdom), 10-15 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Modeling of casting, welding and advanced solidification processes, 7; Cross, M. [ed.] [Univ. of Greenwich, London (United Kingdom). Centre for Numerical Modeling and Process Analysis]; Campbell, J. [ed.] [Univ. of Birmingham (United Kingdom). School of Metallurgy and Materials]; PB: 1030 p.
- Country of Publication:
- United States
- Language:
- English
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