Abstract
Shape Memory Alloys (SMAs) undergo stress and temperature induced reversible phase and variant transformations between a high symmetry phase (austenite) stable at high temperatures and low stresses, and a low symmetry phase (matensite) stable at low temperatures and high stresses. While austenite is a single variant phase, martensite can exist as 24 variants; in one dimension however it can be shown that a model considering two variants would suffice to describe the behavior of the material. It is assumed in this work that the phases exist as a homogeneous fine phase mixture and convert into each other by displacive phase transformations in a self-accommodating manner.