Preparation of Multilayered Ti-Al Alloys by Solid Reaction

Abstract:

The multilayered materials with different combinations of Ti, Al and Ti-Al intermetallics were prepared by heat treatment and hot pressing (HP) with elemental foils. The microstructures and phase formation of the obtained samples were detected by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). When the HP is applied under the melt point of aluminum, aluminum is the only diffusive element across the oxide films on the surface of the initial foils; however, some unusual TiAl₃ particles are found in the multilayered structure due to the broken of oxide films; after hot pressing for 4 hours, all the aluminum was consumed; many voids exist at the centerline of TiAl₃ layers, which are mainly caused by Kirkendall effect and the difference of molar volumes between reactants and products; before the aluminum is completely consumed, TiAl₃ is the only product in the solid reaction under the melting temperature of aluminum; however, other Ti-Al intermetallics like Ti₃Al and TiAl are formed in the updated temperature diffusion after aluminum is consumed.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 1-8
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.1
• Online since: February 2013
• Authors: Yan Bo Sun, Mao Wen Liu, Su Jing Ge, Feng Mei Ma, Chao Li Ma
• Keywords: Diffusive Reaction, Foils, Intermetallic, Multilayered

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