  We study numerically the time evolution of two-dimensional (2D) domain
patterns in proper tetragonal-orthorhombic (T-O) ferroelastics. Our results,
found by solving equations of motion derived from classical elasticity theory,
disagree with those found by other methods. We study first the growth of the 2D
nucleus resulting from homogeneous nucleation events. The later shape of the
nucleus is largely independent of how it was nucleated. In soft systems, the
nucleus forms a flower-like pattern. In stiff systems, which seem to be more
realistic, it forms an X shape with twinned arms in the 110 and \110
directions. Second, we study the relaxation that follows completion of the
phase transition; at these times, the T phase has disappeared and both O
variants are present, segregated into domains separated by domain walls. We
observe a variety of coarsening mechanisms, most of them counterintuitive.
