MICROSTRUCTURE CHARACTERIZATION OF Ti-5%Cu, Ti-7%Cu Y Ti-15%Cu ALLOYS USING X-RAY DIFRACTION

ALICIA E. ARES; PROTASIO NERY ANDRADE; CARLOS E. SCHVEZOV

Puerto Madryn ? Chubut

Otro; SEGUNDA REUNIÓN DE LA ASOCIACIÓN ARGENTINA DE CRISTALOGRAFÍA; 2006

Asociación Argentina de Cristalografía

Because of its high strength to weight ratio, titanium is used in a variety of applications, including products where weight is of importance such as aircraft, sporting equipment, etc. Because of its excellent corrosion resistance, titanium is also used for chemical processing, desalination, power generation equipment, valve and pump parts, marine hardware, and prosthetic devices. In the present research we investigate the microstructure of titanium casting alloys, Ti-5wt%Cu, Ti-7wt%Cu and Ti-15wt%Cu (weight percent) solidified using copper moulds. The identified phase in the x-ray diffraction pattern is not in equilibrium because the samples were solidified using high velocities inside the copper moulds. The identified phases in the diffraction pattern were hexagonal martensite and the Ti intermetallic phase. A metaestable microstructure were formed by very fast cooling, resulting in the transformation of martensite, instead of formed the equilibrium phases. The obtained results indicated that the solidification microstructure in the Ti-Cu system depending of the alloy composition. The alloys with eutectic composition resulting in the martensite formation and the hypereutectic alloys formed α? martensite combined with the intermetallic composite.