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Pressure enhancement of the isostructural cubic decomposition in Ti1−xAlxN

Appl. Phys. Lett. 95, 181906 (2009); doi:10.1063/1.3256196

Published 2 November 2009

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B. Alling, M. Odén, L. Hultman, and I. A. Abrikosov
Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
The influence of pressure on the phase stabilities of Ti1−xAlxN solid solutions has been studied using first principles calculations. We find that the application of hydrostatic pressure enhances the tendency for isostructural decomposition, including spinodal decomposition. The effect originates in the gradual pressure stabilization of cubic AlN with respect to the wurtzite structure and an increased isostructural cubic mixing enthalpy with increased pressure. The influence is sufficiently strong in the composition-temperature interval corresponding to a shoulder of the spinodal line that it could impact the stability of the material at pressures achievable in the tool-work piece contact during cutting operations. ©2009 American Institute of Physics
History: Received 28 September 2009; accepted 7 October 2009; published 2 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/181906/1
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KEYWORDS and PACS

Keywords
PACS
  • 62.50.-p
    High-pressure effects in solids and liquids
  • 64.75.Nx
    Phase separation and segregation in solid solutions
  • 64.75.Ef
    Mixing (phase equilibria aspects)
  • 65.40.G-
    Other thermodynamical quantities of crystalline solids
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (21)
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