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Site Selection and Pseudo-Clustering Behaviors of Alloying Elements in Aluminum-Lean gamma-TiAl Intermetallics
Date
2010-02-01
Author
AYKOL, Muratahan
Mehrabov, Amdulla
Akdeniz, Mahmut Vedat
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Site selection and pseudo-clustering behaviors of the various M alloying elements in Al-lean Ti50Al50-X M (X) (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 L1(0)-type structure of gamma-TiAl into account. It was shown that the site occupation characteristics of the M alloying element atoms in gamma-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 gamma-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.
Subject Keywords
Mechanics of Materials
,
Condensed Matter Physics
,
Metals and Alloys
URI
https://hdl.handle.net/11511/36218
Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
DOI
https://doi.org/10.1007/s11661-009-0085-x
Collections
Department of Metallurgical and Materials Engineering, Article