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- W1982344900 endingPage "13470" @default.
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- W1982344900 abstract "Modifications to alloy chemistry are often used to tailor the intrinsic flow behavior of structural materials. Models of solution strengthening, high-temperature yield stress and creep must relate the effects of chemistry to the mechanisms which influence these material properties. In ordered alloys, additional information regarding the crystallographic site occupancy of substitutional solid solutions is required. The energy of intrinsic and substitutional point defects in ${L1}_{0}$ TiAl are calculated within a first principles, local density functional theory framework. We calculate the relaxed structures and energies of vacancies, antisites, and substitutional defects using a plane-wave pseudopotential method. The results of these total energy calculations are incorporated into a simple thermodynamic model in order to determine the density of point defects as a function of temperature and stoichiometry. Defect densities are presented as a function of alloy chemistry and temperature for binary TiAl and ternary additions (Si, Nb, Mo, Ta, and W). Defect formation energies are calculated using the derived chemical potentials of each atomic species for several alloy compositions. The predicted site selection of the solutes are in excellent agreement with recent x-ray emission experiments using a quantitative statistical method for atom location by channelling enhanced microanalysis." @default.
- W1982344900 created "2016-06-24" @default.
- W1982344900 creator A5022840151 @default.
- W1982344900 creator A5052392034 @default.
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- W1982344900 date "1998-06-01" @default.
- W1982344900 modified "2023-10-16" @default.
- W1982344900 title "Site preferences and formation energies of substitutional Si, Nb, Mo, Ta, and W solid solutions in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>L</mml:mi><mml:mn>1</mml:mn><mml:mn /></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Ti-Al" @default.
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- W1982344900 doi "https://doi.org/10.1103/physrevb.57.13459" @default.
- W1982344900 hasPublicationYear "1998" @default.
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