Which one is the relationship between precipitation/decomposition (of coherent and semi-coherent phases) rate and peak profile changing?

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Conrado R. M. Afonso

Hello Rafael, in this case (of coherent and semi-coherent phases), are you talking about omega phase precipitation in Beta Ti alloys? Or are you talking about phase separation in Beta Ti phase? I think that coherent and semi-coherent Beta' phase should affect the FWHM due to distortion in the crystalline net, leading to broadenning of the 2teta peak of Beta Ti phase (or: latice strain, in my opinion).

Rafael Paiotti M. G.

Dear Prof. Conrado,

I'm thinking about your answer and probably I should verify my question, as it is clear that lattice strain causes line broadening and, consequently, FWHM improvement. And, most important, interfacial energy changes the precipitate morphology (gamma-plot), not interfering on line broadening - sorry, it was my misinterpretation and my question doens't make sense.

My case is about alpha and alpha" precipitation during the ageing, starting from (beta + athermal omega) without (or, at least, perceptible) (athermal -> iso omega) transformation.

Thank you for the answer!