Home CUSTOMERS Kovove Materialy-Metallic Materials 2012 Metallic Materials Vol. 50 (2012), no. 5, pp.301-307

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Metallic Materials Vol. 50 (2012), no. 5, pp.301-307

Title: Interaction between phase transformation and compression sintering in a TiAl-based intermetallic alloy

Abstract: The metastable structure of a Ti-48Al-2Cr-2Nb atomised powder is analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), revealing that it mostly contains the α disordered phase, with traces of γ and β/B2 phases. Then, the evolution of the alloy towards its stable (γ+ α2) structure during continuous heating is studied by differential thermal analysis (DTA), differential scanning calorimetry (DSC) and XRD of heat treated powders. Transformation takes place in a narrow temperature domain, ranging between 620 and 700 °C. It is characterised by a transformation enthalpy of about 2200 J/mol. Uniaxial compression during continuous heating reveals a transient consolidation of the powder in this transformation range, with a relative magnitude of about 1.9 % for a compression stress of 100 MPa. It is proposed that this phenomenon could be due to phase transformation plasticity.

Keywords: titanium aluminides, based on TiAl, phase transformation, plastic deformation mechanisms, powder metallurgy, including consolidation, microstructure
Year: 2012, Volume: 50, Issue: 5 Page From: 301, Page To: 307
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