Abstract
In this paper the decomposition and evolution of microstructures of the metastable β-phase during aging of Ti10V2Fe3Al, VST5553, and Beta-21S alloys were studied. A comparative study of the evolution of the microstructure and crystal lattice of phases in alloys during aging has been carried out. Features of the nucleation and growth of the secondary α-phase formed during aging were observed using scanning electron microscopy. The concomitant diffusion redistribution of alloying elements between the phases was studied using the method of full-profile X-ray diffraction analysis. It has been established that during aging, the change in the periods of crystal lattices in the studied alloys has a general pattern, which is associated with the common nature of the process of diffusion redistribution of alloying elements between phases. The morphology formed during the decomposition of the secondary α-phase differs between alloys and is determined by the stability of the β-phase after quenching.
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