Аннотация:In this paper, the stress effects on solidification
microstructures during laser sintering of alloy powders are
investigated, using a phase field approach. Coupling equations
among phase, temperature, concentration and strain/stress are
derived based on thermodynamic considerations. Thermal and
concentration expansions, transformation dilatation, and strain
deformation dependency on phase transformation are included in
the formulation. A linear stability analysis of solidification front
is carried out, to find dispersion relations and a spectrum of wave
numbers of unstable perturbations. It is shown, that, in addition
to the thermal and mass transfer processes, the strain field
generated during microstructure evolution is another important
factor that affects the instability mode. An increase in stress
increases the maximally wavelength and amplification rate of the
unstable fluctuations.