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A Discussion of the Dynamic Specific Heat during Solidification
Singapore Inst. of Mfg. Technology, Process Technology Division, Precision Metal Forming Group, Singapore.ORCID iD: 0000-0002-0101-0062
2003 (English)In: Materials Science Forum, ISSN 0255-5476, Vol. 437-438, 391-394 p.Article in journal (Other academic) Published
Abstract [en]

State-of-the-art solidification theory shows that the apparent latent heat of fusion decreases with increasing cooling rates, due to the creation of lattice defects. A portion of the defects condenses during and after solidification, releasing heat, causing the apparent specific heat to be dynamic. Experimental data on copper shows an increase and a maximum in the apparent specific heat at moderate cooling rates. An extension of the existing theory for dynamic specific heats is made. Previous models do not reproduce the maximum, nor do they reproduce the equilibrium value at low cooling rates. The presently derived model reproduces all essential features of the experimentally data. It also clearly shows that the effect at moderate cooling rates is significant and the tabulated values are not applicable for modelling casting.

Place, publisher, year, edition, pages
Singapore, 2003. Vol. 437-438, 391-394 p.
Keyword [en]
Dynamic Properties, Solidification, Specific Heat, Vacancies, Latent heat of fusion, Cooling, Copper, Defects, Polynomials
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-16648OAI: oai:DiVA.org:hj-16648DiVA: diva2:454613
Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2015-06-01Bibliographically approved

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Jarfors, A. E. W.
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