Titanium alloys for structural applications
Ti alloys possess high specific strengths, excellent toughness and good corrosion resistance, and are an excellent choice for many aerospace and biomedical applications. An even distribution of fine alpha precipitates is found to enhance the mechanical properties of beta-Ti alloys. One of the heterogeneous nucleation sites for alpha is the metastable omega phase. The research focus is to characterize the chemistry and structure, at an atomic scale, during the phase evolution, to unveil the controversial phase transformation mechanisms. The figure below shows that the Mo-lean regions, delineated by the Mo iso-concentration surfaces at 1.2 at.%, facilitate the formation of the omega phase that is shown in the aberration-corrected TEM image.
Publications:
J. Ballor, T. Li, F. Prima, C.J. Boehlert, A. Devaraj, A review of the metastable omega phase in
beta titanium alloys: the phase transformation mechanisms and its effect on mechanical properties, International Materials Reviews, (2022) 1-20.
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T.Li, M. Lai, A.
Kostka, S. Salomon, S. Zhang, C. Somsen, M.
Dargusch, D. Kent, Composition of
the nanosized orthorhombic O' phase and its direct
transformation to fine α during ageing in metastable β-Ti alloys, Scripta
Materialia, 170 (2019),
183-188.Read
more..
T.Li, D. Kent, G. Sha,
L.T. Stephenson, A.V. Ceguerra, S.P. Ringer, M.S.
Dargusch, J.M. Cariney, New
insights into the phase transformations to
isothermal ω and ω-assisted α in
near-β alloys, Acta Mater. 106 (2016) 353-366.Read
more..