4. Conclusion The concept of hybrid

4. Conclusion
The concept of hybrid support structures for the integration of piezoelectric transducers has been successfully applied to aluminum die casting. X-ray images indicate a damage free integration of the patches. Coating techniques to realize a firmly bonded Al-Al-compound have been presented. Here, an intermetallic compound could be accomplished and investigated by optical methods and x-ray analysis. Although experiments observing mechanical properties still have to be performed, diffusion processes indicate satisfactory mechanical compound characteristics.

Acknowledgements
This research is supported by the Deutsche Forschungsgemeinschaft (DFG) in context of the Collaborative Research Centre/Transregio 39 PT-PIESA, subproject B3.