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

Materials in New Zealand
First Online:
Received:
Accepted:

Abstract

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.

Keywords

Milling Powder Particle Composite Powder Mechanical Milling Milled Powder 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© 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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