Off-stoichiometric Ni-Mn-Ga Heusler alloys exhibit a large variety of martensitic structures as well as several accompanying phenomena, as precursor or pre-martensitic effects and inter-martensitic transformations (IMT). Both the ferromagnetic and the paramagnetic martensites tend to exhibit stress- and temperature- induced IMT. Three main martensitic phases are formed, namely 10M, 14M and 2M in the monoclinic coordinate system or, in cubic coordinates, designed as five-layer modulated tetragonal (c/a <1), seven-layer orthorhombic and non-modulated tetragonal (c/a>1), respectively.

The sequence of thermally and stress-induced inter-martensitic transformations has been studied in a Ni_52.0-Mn_24.4-Ga_23.6 single crystal. Transmission electron microscopy through in situ cooling experiments has confirmed the thermally induced martensitic phases and their sequence. The stress-strain behavior under compression along the <110>_P and <100>_P crystallographic directions, at different temperatures, has also been studied for this compound and a stress-temperature phase diagram has been established.

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