Browsing by Author "Thoennessen, L"

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    Thermomechanical processing of titanium alloys
    (Australian Institute of Physics, 2012-02-01) Thoennessen, L; Liss, KD; Dippenaar, RJ; Dehghan-Manshadi, A
    Fine tuning the properties of titanium alloys will be a major challenge for future light weight structural applications in the aerospace industry [1]. The near-β titanium alloy Ti-5553 of composition Ti-5Al-5V-5Mo-3Cr (mass-%) exhibits excellent harden ability and strength characteristics combined with high fracture toughness and excellent high cycle fatigue behavior [2]. Another alloy which shows a good combination of properties, is the α+β titanium alloy Ti-6242 of composition Ti-6Al-2Mo-4Sn-2Zr (mass-%). The mechanical properties of both kinds of titanium alloys are very sensitive to their microstructure which is strongly influenced by the applied parameters during thermomechanical treatment. To control the microstructure during the processing, it is very important to have knowledge about the thermodynamics and kinetics of the phase transformations taking place under different conditions [3]. The intended research is aimed at unveiling the hot-deformation mechanisms and the development of microstructure in the aforementioned titanium alloys. This will be achieved by the comparison of results from both ex situ experiments (such as Gleeble testing, dilatometry and electron microscopy) and in situ studies. The in situ studies shall be conducted by the use of confocal microscopy and modern diffraction methods such as high intensity neutron diffraction and high energy synchrotron radiation. At the end of the research project we expect to fully understand the thermomechanical processes and precipitation behaviors of those two alloys. This understanding will help us to design new industrial processing routes for aerospace parts with better combination of strength and toughness.