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Morphology and Structure of Compacted Coated Powders Studied by SEM and TEM

Published online by Cambridge University Press:  03 October 2008

F. Simões*
Affiliation:
ISEC, Mechanical Department, Engineering Institute of Coimbra, Rua Pedro Nunes, Coimbra 3030-199, Portugal CEMUC, Mechanical Department of Coimbra University, Coimbra 3030-788, Portugal
B. Trindade
Affiliation:
CEMUC, Mechanical Department of Coimbra University, Coimbra 3030-788, Portugal
*
Corresponding author. E-mail: [email protected]

Abstract

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The interest in titanium based intermetallics, such as Ti-Al alloys, for high temperatures applications has been increased in recent years mainly due to their high plastic deformation resistance, chemistry stability (oxidation and corrosion resistance) and creep and fatigue resistance at high temperatures. However, the industrial application of Ti-Al intermetallics is very limited so far, due to the lack of ductility and fracture toughness at room temperature with associated processing difficulties. To overcome this problem and to improve mechanical properties of Ti-Al intermetallics, a powder mixture with atomic composition of Ti52Al48 was synthesized by mechanical alloying (MA) and subsequently coated with a ductile element (aluminium), by d.c. magnetron sputtering. Later, in order to obtain a compacted material, as final step, the coated MA'ed powders were submitted to hot isostatic pressing (HIP), giving rise to a bulk material. The aim of the current work is to understand the influence of coating layer in mechanical alloyed (MA'ed) powders and the influence in bulk material properties.

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Abstract
Copyright
Copyright © Microscopy Society of America 2008