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Title: Kinetic study of the precipitation in physicalvapourdepositedMg–12% wt. Ti alloy
Authors: Garcés, Gerardo, Adeva, Paloma
Keywords: Transition metal alloys
Vapour deposition
Precipitation
Kinetics
Thermal analysis
Issue Date: 2002
Publisher: Elsevier
Abstract: Kinetic parameters of titanium precipitation in Mg–12 wt.% Ti obtained by physicalvapour deposition (PVD) have been studied using the Johnson–Mehl–Avrami equation extended to a non-isothermal transformation. The titanium precipitation takes place in two stages: the first corresponds to the nucleation and growth of the precipitates by diffusion along the basal plane and the second to their coarsening along the [0001] direction. The Avrami exponent, n, has been calculated from the differental scanning calorimtery curves for the two stages. In both cases values of n around 1 were obtained, which indicate a diffusion process dominant in one dimension. Furthermore, at the last stage of titanium nucleus formation, a decrease in Avrami exponent has been observed associated to a fast and progressive saturation of nucleation sites
Publisher version (URL): http://dx.doi.org/10.1016/S0925-8388(02)00793-4
URI: http://hdl.handle.net/10261/57777
ISSN: 0925-8388
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Citation: Journal of Alloys and Compounds 347 (1-2) : 188-192 (2002)
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