Eutectoid transformation and silicide precipitation in silicon-doped TiAl-based alloys
This project wants to investigate experimentally complex phase transformations at high temperature in TiAl-based alloys. It is a part of a PhD thesis on silicon-doped TiAl-based alloys. Gamma-TiAl alloys are a subject of growing interest for industrial use after decades of more academic research. General Electric has announced the introduction of Ti-48Al-2Cr-2Nb in its new aeroengine GEnx-1B. But this alloy has limitations in temperature service range, namely due to insufficient creep properties over 800°C. Si-doped TiAl alloys are a potential candidate in aerospace applications due to increased mechanical properties at high temperature. In this context, the fundamental understanding of the phase transformations starting from single-phased alpha domain over ~1350°C and leading to M5Si3 strengthened lamellar or duplex microstructures is crucial. We propose to study five grades : one TiAl+Si ternary alloy, one TiAl+Zr ternary alloy and three quaternary alloys showing the influence of Nb, Mo and Zr alloying both on the eutectoid transformation and the M5Si3 formation. For accomplishing this, we apply for 2 days of beam time at D20 running at high flux or for 3 days at D1B.
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PERRUT Mikael; CUELLO Gabriel; DALOZ Dominique; DENQUIN Anne; PARIS Antoine and PUENTE ORENCH Ines. (2013). Eutectoid transformation and silicide precipitation in silicon-doped TiAl-based alloys. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-79
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