The investigation of die-pressing and sintering behavior of ITP CP-Ti and Ti-6Al-4V powders

W. Chen, Y. Yamamoto, W. H. Peter, M. B. Clark, S. D. Nunn, J. O. Kiggans, T. R. Muth, C. A. Blue, J. C. Williams, K. Akhtar

Research output: Contribution to journalArticleResearchpeer-review

34 Citations (Scopus)

Abstract

This paper investigated the die-pressing and sintering behavior of ITP CP-Ti and Ti-6Al-4V powders produced by the Armstrong Process®. The ITP powders have an irregular coral like, dendritic morphology, with a dendrite size of approximately 2-5 μm. As-received as well as milled powders were uniaxially pressed at designated pressures up to 690 MPa to form disk samples with different aspect ratios. In the studied pressure range, an empirical powder compaction equation was applied to linearize the green density - pressure relationship, and powder compaction parameters were obtained. The ITP Ti-6Al-4V powder exhibited a significantly higher sinterability than the CP-Ti powder. This was explained to be due to the higher diffusivity of V in β-Ti at the sintering temperature. The Ti-6Al-4V samples with a green density of 71.0% increased to 99.6% after sintering at 1300 °C for 1 h. An ex-situ technique was used to track the powder morphology change before and after sintering.

Original languageEnglish
Pages (from-to)440-447
Number of pages8
JournalJournal of Alloys and Compounds
Volume541
DOIs
Publication statusPublished - 15 Nov 2012
Externally publishedYes

Keywords

  • Die-press
  • Powder metallurgy
  • Sinter
  • Titanium alloys

Cite this