  We investigate a linear, fully coupled thermoelasticity problem for a highly
heterogeneous, two-phase medium. The medium in question consists of a connected
matrix with disconnected, initially periodically distributed inclusions
separated by a sharp interface undergoing an a priori known interface movement
due to phase transformations. After transforming the moving geometry to an
$\varepsilon$-periodic, fixed reference domain, we establish the well-posedness
of the model and derive a number of $\varepsilon$-independent a priori
estimates. Via a two-scale convergence argument, we then show that the
$\varepsilon$-dependent solutions converge to solutions of a corresponding
upscaled model with distributed time-dependent microstructures.
