In-situ studies of γ-based Ti-Al alloys using synchrotron x-ray and neutron diffraction
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Date
2017-02-02
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Australian Institute of Physics
Abstract
Because of their low density, good strength, corrosion resistance and high service temperature γ-based titanium aluminides are being considered as materials of choice in the aerospace and automobile industry. In our study, we focus on a series of interesting γ-based Ti-Al alloys with respect to the lattice evolution of Ti-45Al-7.5Nb-0.25C (at. %) during heating under a pressure of 10 GPa followed by synchrotron radiation; order-disorder transitions and shortrange-order in polysynthetic twinned Ti-Al single crystals using neutron scattering and phase transformation and texture evolution of high pressure torsion samples of Ti-45Al-7.5Nb by using complementary X-ray and neutron diffraction. Lattice parameter evolution can be separated into four contributions: thermal expansion, composition, order parameter and pressure. Diffuse scattering at reciprocal lattice positions provides evidence of short-range order, even in the disordered phase at very high temperature. Structural and atomic disorder is largely introduced by severe plastic deformation. These findings are fundamental to develop an improved understanding of the complex phase transformations. We report our first results of experiments performed under extremely high-pressure, relevant to advanced manufacturing
processes.
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Keywords
Alloys, Synchrotrons, X-ray diffraction, Neutron diffraction, Titanium, Aerospace industry, Order-disorder transformations, Crystal lattices
Citation
Li, Z., Liss, K.-D., & Dippenaar, R. (2017). In-situ studies of γ-based Ti-Al alloys using synchrotron x-ray and neutron diffraction. Poster presented to the 41st Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, Australia, 31st January - 3rd February 2017. (pp. 91). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2017/Wagga_2017_Conference_Handbook.pdf