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To visualize the grain boundary role on the shape memory property of Cu-Zn-Al alloy, we have followed the austenitic structure evolution, of crystals submitted to a training treatment, by synchrotron X-ray topography in white beam. Single crystals, tricrystals and polycrystalline samples have been studied. The comparison of results shows that in polycrystalline samples large, non recoverable stresses, develop in all grains. These stresses must be taken into account when the origin of the shape memory property is discussed

X-Ray Diffraction Effects Given by the Austenitic Phase During the Training Process of Shape Memory Cu-Zn-Al Polycrystals