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      Spinodal decomposition of cubic Ti 1− x Al x N: Comparison between experiments and modeling

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          Abstract

          Annealing of cubic (c) Ti 1− x Al x N, possessing NaCl structure, leads to decomposition into the stable constituents c-TiN and hexagonal (h) AlN (ZnS wurtzite structure) via the formation of metastable c-TiN rich and metastable c-AlN rich phases. In this paper, we describe the influence of sizes of the newly formed particles and strain energy due to their different lattice parameter and elastic constants with respect to the remaining matrix on decomposition processes and energetics. Good agreement between the enthalpy output obtained from differential scanning calorimetry and values derived from ab-initio and continuum mechanical based calculations for the decomposition and transformation processes occurring is obtained. Based on the comparison between experiments including X-ray diffraction and small-angle neutron scattering of annealed samples and modeling we can conclude that spinodal decomposition is present in c-Ti 1− x Al x N coatings with x = 0.50 and 0.66, whereas the alloy with x = 0.25 is outside the spinodal.

          Most cited references15

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          Titanium aluminum nitride films: A new alternative to TiN coatings

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            Microstructural design of hard coatings

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              On structure and properties of sputtered Ti and Al based hard compound films

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                Author and article information

                Journal
                ijmr
                International Journal of Materials Research
                Carl Hanser Verlag
                1862-5282
                2195-8556
                2007
                : 98
                : 11
                : 1054-1059
                Affiliations
                a Materials Chemistry, RWTH-Aachen, Aachen, Germany
                b Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria
                c Thin Film Division, Department of Physics (IFM), Linköping University, Linköping, Sweden
                d Institute for Materials Research, GKSS Research Centre, Geesthacht, Germany
                Author notes
                [* ] Correspondence address, Dr. Paul H. Mayrhofer Department of Physical Metallurgy and Materials TestingMontanuniversität LeobenFranz Josef Straße 18, A-8700 Leoben, AustriaTel.: +43 3842 402 4211Fax: +43 3842 402 4202, E-mail: mayrhofer@ 123456mu-leoben.at
                Article
                MK101570
                10.3139/146.101570
                58f30d0e-1c6a-42c3-a3b9-4933e01a9628
                © 2007, Carl Hanser Verlag, München
                History
                : 16 March 2007
                : 2 August 2007
                Page count
                References: 27, Pages: 6
                Categories
                Basic

                Materials technology,Materials characterization,Materials science
                Ab-initio calculation,Small-angle neutron scattering,Decomposition,TiAlN,Calorimetry

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