Effect of heat treatments on discontinuous precipitation kinetics in Al-30 wt.% Zn alloy
- Department of Metallurgy, University of Biskra, Biskra-07000-B.P.145 (Algeria)
- Laboratoire de Physique et Mecanique des Materiaux Metalliques, IOMP, University of Ferhat Abbas 19000 Setif (Algeria)
The discontinuous precipitation kinetics in Al-30% wt. Zn alloy have been investigated at temperatures ranging from 348 to 503 K (75 to 230 deg. C) by using an optical microscopy, X-ray diffraction, differential dilatometer, differential scanning calorimetry and microhardness measurement. We have found that at all temperatures less than 180 deg. C the supersaturated solid solution of quenched alloy was observed to decompose completely by a cellular precipitation reaction. Quantitative metallography methods have been applied to measure the corresponding transformed volume fractions at different temperatures and times of precipitation. The variation of the heating rate and the application of different methods have allowed us to calculate two kinetic parameters of precipitation: the activation energy of the process and the Avrami exponent.
- OSTI ID:
- 22066107
- Journal Information:
- Materials Characterization, Vol. 60, Issue 8; Other Information: Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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