Abstract
Abstract The morphology of a coherent two-phase alloy is dependent on both the coherent strain energy from the lattice mismatch and the interphase boundary energy. It has been demonstrated that the morphology can be changed by applying stress or strain during thermomechanical processes such as the stressed ageing. However, the effects of inhomogeneous stresses on morphological evolution have not been well understood. This paper reports our recent computational study on the morphological evolution of coherent Ti11Ni14 precipitates in a Ti-Ni shape memory alloy under inhomogeneous stresses. It was demonstrated that the elastic coupling between an applied strain and the coherency strain becomes position dependent when the applied strain is inhomogeneous. As a result, a coherent precipitate may change its shape and migrate under the inhomogeneous applied strain. It was demonstrated that the migration rate is linearly proportional to the gradient of the inhomogeneous strain. In a multivariant system, an inhomo...
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