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MM: Fachverband Metall- und Materialphysik

MM 19: Topical Session Designing Innovative Structural Materials and Steels V

MM 19.1: Topical Talk

Dienstag, 23. März 2010, 10:15–10:45, H4

Influence of pressure on decomposition thermodynamics of structural materials — •Igor A. Abrikosov¹, Björn Alling¹, Alena V. Ponomareva², Olga Yu. Vekilova¹, and Sergei I. Simak¹ — ¹Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden — ²Department of Theoretical Physics, Moscow State Institute of Steel and Alloys, Moscow 119049, Russia

We show, by means of state-of-the-art theoretical simulations, that a pressure which is often present in practical applications of structural materials may have profound effect on their decomposition thermodynamics. In TiAlN, which is widely used as hard protective coating in cutting tool applications, the hydrostatic pressure enhances the tendency for isostructural decomposition, including spinodal decomposition. In Fe-Cr steels we observe a concentration reversal of pressure induced tendency towards isostructural decomposition.