Résumé : The aim of this Thesis was on one side to contribute to a better understanding of the phases formed in the TiAlSiN(O) system and the influence of impurities on their properties. On the other side it was also aimed in the Thesis to individually study the phases forming the nanocomposite.

In each chapter the individual conclusions from that particular chapter are presented, a summary of the most relevant conclusions and achievements is listed below.

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