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Addition of Rare Earth Elements to MIM-processed Ti-6Al-4V

  • : W. Limberg, T. Ebel, K. U. Kainer
  • : Helmholtz-Zentrum Geesthacht
  • : 2013, Vol 1, p. 351-356
  • : PDF Download
  • : 2013

Abstract

In this study, CeSi2 powder was added to Ti-6Al-4V-powder and processed by metal injection moulding (MIM) with the aim of enhancing the mechanical properties as it was observed at specimens produced by uniaxial pressing and sintering.

Tensile test specimens were produced by MIM using gas atomised Ti-6Al-4V-powder with additions of CeSi2 and pure Cerium of 0.5 wt.-%. Sintering took place at a temperature of 1350 °C. The addition of CeSi2 resulted in a noticeably refinement of the microstructure due to pinning of the grain boundaries by CeO2 particles, which were formed during the sintering process. However, the addition of CeSi2 also led to higher porosities of the sintered parts. Agglomerates of large CeO2 particles were found, which indicates that homogenisation during feedstock preparation was insufficient. Those agglomerates are most probably responsible for the tensile test results, which did not show the expected increase of the tensile strength.

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