Browsing by Author "Staab, Torsten E.M."

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    Stability of Cu-precipitates in Al-Cu alloys
    (2018-06-20) Staab, Torsten E.M.; Folegati, Paola; Wolfertz, Iris; Puska, Martti J.; University of Würzburg; Polytechnic University of Milan; University of Bonn; Department of Applied Physics
    We present first principle calculations on formation and binding energies for Cu and Zn as solute atoms forming small clusters up to nine atoms in Al-Cu and Al-Zn alloys. We employ a density-functional approach implemented using projector-augmented waves and plane wave expansions. We find that some structures, in which Cu atoms are closely packed on (100)-planes, turn out to be extraordinary stable. We compare the results with existing numerical or experimental data when possible. We find that Cu atoms precipitating in the form of two-dimensional platelets on (100)-planes in the fcc aluminum are more stable than three-dimensional structures consisting of the same number of Cu-atoms. The preference turns out to be opposite for Zn in Al. Both observations are in agreement with experimental observations.