Precipitation in a high silicon Al-Si alloy studied by isothermal calorimetry
Precipitation in a high silicon Al-Si alloy studied by isothermal calorimetry
The precipitation in an Al–6mass%Si alloy was investigated by isothermal calorimetry. Three types of heat treatment were studied and precipitation rates in the samples increase in the order: Furnace cooled, ice-water quenched (IWQ) and naturally aged after IWQ. With the aid of a novel model for nucleation and growth reactions the measured exothermic heat flow is interpreted in terms of two processes: Growth of large undissolved Si particles and growth of pre-existing nuclei. The activation energies for precipitation are EA=0.89 eV for IWQ samples and EA=0.94 eV for furnace cooled samples.
Al–Si, precipitation, isothermal calorimetry
277-280
Starink, M.J.
14ee8acd-2e6d-4308-a97c-b7c04b27fe40
Zahra, A.-M.
602ec757-47a9-47dc-9739-1ba7a0e0d3db
1998
Starink, M.J.
14ee8acd-2e6d-4308-a97c-b7c04b27fe40
Zahra, A.-M.
602ec757-47a9-47dc-9739-1ba7a0e0d3db
Starink, M.J. and Zahra, A.-M.
(1998)
Precipitation in a high silicon Al-Si alloy studied by isothermal calorimetry.
Materials Science and Engineering: A, 241 (1-2), .
(doi:10.1016/S0921-5093(97)00460-7).
Abstract
The precipitation in an Al–6mass%Si alloy was investigated by isothermal calorimetry. Three types of heat treatment were studied and precipitation rates in the samples increase in the order: Furnace cooled, ice-water quenched (IWQ) and naturally aged after IWQ. With the aid of a novel model for nucleation and growth reactions the measured exothermic heat flow is interpreted in terms of two processes: Growth of large undissolved Si particles and growth of pre-existing nuclei. The activation energies for precipitation are EA=0.89 eV for IWQ samples and EA=0.94 eV for furnace cooled samples.
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Published date: 1998
Keywords:
Al–Si, precipitation, isothermal calorimetry
Organisations:
Engineering Sciences
Identifiers
Local EPrints ID: 21673
URI: http://eprints.soton.ac.uk/id/eprint/21673
ISSN: 0921-5093
PURE UUID: def06783-dc19-4e54-9b11-df816e476896
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Date deposited: 13 Dec 2006
Last modified: 15 Mar 2024 06:31
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Author:
M.J. Starink
Author:
A.-M. Zahra
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