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Título:
MICROSTRUCTURE CHARACTERIZATION OF Ti-10%Nb AND Ti-25%Nb ALLOYS USING X-RAY DIFRACTION
Autor/es:
ALICIA ESTHER ARES; CARLOS ENRIQUE SCHVEZOV
Lugar:
San Luis, Argentina
Reunión:
Otro; TERCERA REUNION DE LA ASOCIACION ARGENTINA DE CRISTALOGRAFIA; 2007
Institución organizadora:
Asociación Argentina de Cristalografía
Resumen:
Titanium alloys has high strength to weight ratio and are 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-10wt%Nb and Ti-25wt%Nb (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. A metaestable microstructure were formed by very fast cooling, resulting in the transformation of L martensite, instead of formed the equilibrium phases. The obtained results indicated that the solidification microstructure in the Ti-Nb system depending of the alloy composition. The alloys with eutectic composition resulting in the martensite formation and the hypereutectic alloys formed martensite.