Inverse Ripening and Rearrangement of Precipitates under Chemomechanical Coupling
R. D. Kamachali, C. Schwarze,
Volume: 130. Pages: 292--296
DOI: 10.1016/j.commatsci.2017.01.024
Published: 2017
Abstract
Abstract A coupling between diffusional and mechanical relaxation
raised from composition-dependent elastic constants, and its effects
on the evolution of precipitates with finite misfit strain are investigated.
Inverse ripening has been observed where smaller precipitate grows
at the expense of a larger one. This occurs due to fluxes generated
under elastically-strained solute gradients around precipitates that
scales with R r 6 where R and r are the precipitate radius and the
radial coordinate, respectively. Both isotropic and anisotropic dependency
of elastic constants on the composition were considered. The latter
leads to the emergence of new patterns of elastic anisotropy and
rearrangement of precipitates in the matrix.