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TNB-V5 Alloy Modification through Elemental Powder Metallurgy

  • : Soyama, J1
  • : 1Helmholtz-Zentrum Geesthacht
  • : PDF Download
  • : 2012

Abstract

One challenge for improvement of the performance of MIM parts is the tailor-made alloy design. Unfortunately, it is difficult to obtain small amounts of alloy powders for screening experiments on alloy optimization. In this work a versatile method for preparing modified alloys from a base alloy and additions of elemental powder was evaluated. Variations of TNB-V5 (Ti-45Al-5Nb-0.2B-0.2C, all atomic percent) with aluminium content ranging from 43 to 47 at% were prepared by uniaxial pressing of a mix of binder, elemental powders and pre-alloyed TNB-V5. Adding elemental aluminium increased the required sintering temperatures. However, for all compositions porosities smaller than 5% could be achieved. The effect of composition and cooling rate in two different alloys (TNB-V5 and Ti-45Al-5Nb-1.5Mn-0.2B-0.2C at%) prepared by MIM was studied in the range of 100 to 10 K/min and characterised by tensile and hardness testing. It was found that significant changes in microstructure take place at cooling rates below 50 K/min.
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