NiMnGa alloys have attracted extensive attention because their ferromagnetic characteristic provides an additional degree of freedom to control both the shape memory effect and the multi-stage phase transformations in this Heusler system. Technically, along with the large magnetic-field-induced strains… Contents 1 The Martensitic Transformation 1.1 Introduction 1.2 Diffusional Transformations 1.3 Diffusionless Transformations 1.4 Martensitic Transformations [...]