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Journal of Materials Science

, Volume 42, Issue 12, pp 4197–4204 | Cite as

The influence of magnetron sputtered silver and titanium coatings on the compaction and properties of surface modified PM Ti-48Al powders

  • Filipe Neves
  • Nelson Duarte
  • Bruno TrindadeEmail author
Article
  • 83 Downloads

Abstract

Thin layers of silver and titanium were deposited onto commercial Ti–48Al particles by magnetron sputtering prior to their consolidation by hot isostatic pressing and subsequent heat treatment. Based on picnometry and electron probe microanalysis results, average values of 1.5 and 2.5 at.%, respectively, were obtained for the silver and titanium contents in the coated particles. The surface modified Ti–48Al particles exhibited improved sintering ability than the unmodified ones. The consolidated samples have duplex microstructures formed by γ-TiAl and γ-TiAl + α2-Ti3Al grains. Ag-rich nanoprecipitates were detected in the microstructure of the compacted Ti-48Al + Ag sample. The coatings are no longer visible at the grains boundaries after a subsequent homogenization heat treatment at 1200°C. The highest values of hardness and Young’s modulus were obtained for the Ti–48Al + Ag sample, associated with a higher density and a lower percentage of pores.

Keywords

48Al Powder 48Al Particle Indentation Modulus Uncoated Particle HIPed Sample 

Notes

Acknowledgements

The authors gratefully acknowledge the financial support from Portuguese Foundation for Science and Technology (FCT) through project POCTI/CTM/46498/2002.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.INETI, DMTPLisboaPortugal
  2. 2.Mechanical Department – Polo II of the Coimbra UniversityUniversity of CoimbraCoimbraPortugal

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