Journal of Materials Science

, Volume 47, Issue 3, pp 1234–1243 | Cite as

Microstructural evolution during mechanical milling of Ti/Al powder mixture and production of intermetallic TiAl cathode target

  • Brian GabbitasEmail author
  • Peng CaoEmail author
  • Stella Raynova
  • Deliang Zhang
Materials in New Zealand


Titanium aluminides are of great technological interest because of their attractive mechanical properties. Mechanical milling/alloying is a promising powder metallurgical technique, which can achieve ultrafine, uniform and manipulable microstructures. In this study, we employed a recently revisited discus mill to produce a composite Ti–(50–57) at.%Al powder feedstock, which is suitable for hot consolidation to produce bulk cathode targets for physical vapour deposition (PVD) coatings. The effects of milling time, quantity of process control agent (PCA) and discus-to-powder weight ratio (DPR) on the microstructure evolution of the attendant Ti/Al composite powder were investigated in detail. It was found that to produce Ti/Al composite powders with a fine particle size and a uniform microstructure, the practicable processing parameters should be 2 or 3% isopropanol addition as PCA, 12 h of milling time and at least 13:1 DPR weight ratio. Cathode targets were produced by hot isostatic pressing (HIPing) the as-milled powders. The targets were then used to produce a PVD TiAlN coating which had an average microhardness of 2400 HV.


Milling Powder Particle Composite Powder Mechanical Milling Milled Powder 
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© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Waikato Centre for Advanced Materials (WaiCAM), School of EngineeringThe University of WaikatoHamiltonNew Zealand
  2. 2.Department of Chemical and Materials EngineeringThe University of AucklandAucklandNew Zealand

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