Development of Ti-Nb and Ti-Nb-Fe beta alloys from TiH2 powders Articles uri icon

publication date

  • January 2019

start page

  • 44

end page

  • 53

issue

  • 1

volume

  • 62

international standard serial number (ISSN)

  • 0032-5899

electronic international standard serial number (EISSN)

  • 1743-2901

abstract

  • Ti-Nb beta alloys are a promising alternative as an implant material due to their good properties and low Young's modulus, compared to other Ti-alloys currently employed as biomaterials. In this study, three materials of the Ti-Nb and Ti-Nb-Fe systems were produced by powder metallurgy techniques starting from TiH2 (TH) powder. Several sintering cycles were employed to evaluate the H-2 elimination and the effect of sintering temperature on densification and fraction of beta-Ti phase. Also, the influence of alloying element size using two kinds of Fe powder was evaluated. The highest loss of H-2 was achieved by decreasing heating rate at the temperature range of hydride decomposition. SEM images and XRD results show mainly a beta-Ti phase for TH-40Nb and TH-5Fe-25Nb samples. The TH-12Nb sample shows (alpha + beta) microstructure. Fe addition with smaller particle size seems to improve the diffusion of Nb into Ti which promotes a higher beta-phase fraction and sample homogeneity.

keywords

  • beta-ti alloys; titanium hydride; biomaterials; low cost titanium alloy; titanium hydride; phase-transformations; dehydrogenation; microstructure; decomposition