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Registro de acceso cerrado Kinetic study of the precipitation in physicalvapourdepositedMg–12% wt. Ti alloy

Autor :Garcés, Gerardo
Adeva, Paloma
Palabras clave :Transition metal alloys, Vapour deposition, Precipitation, Kinetics, Thermal analysis
Fecha de publicación :2002
Citación :Journal of Alloys and Compounds 347 (1-2) : 188-192 (2002)
Resumen: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
Versión del editor:http://dx.doi.org/10.1016/S0925-8388(02)00793-4
URI :http://hdl.handle.net/10261/57777
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