Abstract:
The Ni-Ti system alloys have properties that are extremely interesting for the market, which combine the characteristics of shape memory effect (EMF) and superelasticity (SE). However, it is observed that these alloys have great behavioral sensitivity in relation to their composition, thermomechanical conditions and the presence of impurities, giving rise to the processing of alloys with different types based on NiTi intermetallic. In this context, the addition of niobium maintaining an atomic proportion of 47Ni-44Ti-9Nb causes an increase in its thermal thermal, without extinguishing, however, its EMF. In the present work we sought to produce an alloy of the Ni-Ti-Nb system via powder metallurgy, via conventional sintering (SC) and an end of observation microstructural evolution of the 47Ni-44Ti-9Nb alloy. As they were analyzed via optical microscopy, scanning electron microscopy and X-Ray diffraction, where the collected results indicated that the temperature was insufficient for the formation of a formation mainly of NiTi-B2, despite having evidence of its presence in the samples. In addition, there was little difference in porosity comparing the pressed at 6 ton with the pressed at 9 ton, despite an increase in density.