Internal stress associated with an oriented microstructure of defects are taken into ac count in the thermoelastic balance of martensitic phase transition. From this analysis a macros copic flow rule is determined for the TWME by using a phenomenological approach based on a yield criterion derived from Gibb's free energy expression. Experiments perfor med on a Cu-Zn-A1 polycrystalline alloy trained with a cyclic uniaxial tension test are used for identifying the modelling parameters.
A complete study of Ms-30°C polycrystalline CuAlBe shape memory alloy is made by X Ray diffraction using a texture goniometer equipped with a curved position sensitive detector. Austenite and martensite unit cells parameters are measured. Measured indexes and orientation of the habit plane are compared to those expected by the lattice parameters. Austenite after extrusion shows a strong fiber texture, volumic fraction of austenite and martensite are measured according to the deformation. Internal deformations of three grains of a Ms-100°C CuALBe sample are followed during their macroscopic deformation.
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