Site Selection and Pseudo-Clustering Behaviors of Alloying Elements in Aluminum-Lean γ-TiAl Intermetallics

  • Muratahan Aykol
  • Amdulla O. Mekhrabov
  • M. Vedat Akdeniz
Article

Abstract

Site selection and pseudo-clustering behaviors of the various M alloying elements in Al-lean Ti50Al50–XMX (X = 1, 2, 3, 4, and 5 at. pct) intermetallics have been investigated by means of the ordering energy-dependent and long-range-order forced fast Monte Carlo simulation method. The ordering energies have been calculated via pseudopotential approximation in the electronic theory of alloys up to the third coordination sphere (CS) taking the anisotropic nature of tetragonal L10-type structure of γ-TiAl into account. It was shown that the site occupation characteristics of the M alloying element atoms in γ-TiAl intermetallics are governed by the relative magnitude of partial ordering energies between Ti-M and Al-M atomic pairs. However, the sign of partial ordering energies of these atomic pairs at the first CS becomes important in determining the clustering behavior and controls the dissolution modes of alloying element atoms in the γ-TiAl matrix. The pseudo-clustering behavior of alloying elements reveals three dissolution modes, namely, random dissolution (mode I), planar clustering in two dimensions (mode II), and three-dimensional (3-D) clustering (mode III) of the M occupant atoms.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2009

Authors and Affiliations

  • Muratahan Aykol
    • 1
  • Amdulla O. Mekhrabov
    • 1
  • M. Vedat Akdeniz
    • 1
  1. 1.Novel Alloys Design and Development Laboratory (NOVALAB), Department of Metallurgical and Materials EngineeringMiddle East Technical UniversityAnkaraTurkey

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