Compaction of Ti-6Al-4V Powder by ECAE with Back-Pressure |
| Journal |
Advanced Materials Research (Volumes 29 - 30) |
| Volume |
Advanced Materials and Processing IV |
| Edited by |
Deliang Zhang, Kim Pickering, Brian Gabbitas, Peng Cao, Alan Langdon, Rob Torrens and Johan Verbeek |
| Pages |
33-36 |
| DOI |
10.4028/www.scientific.net/AMR.29-30.33 |
| Online since |
November, 2007 |
| Authors |
Rimma Lapovok,
Dacian Tomus,
Barry C. Muddle
|
| Keywords |
Back Pressure, Compaction, Density, Equal Channel Angular Extrusion (ECAE), Pore, Ti-6Al-4V Powder |
| Abstract |
Powder metallurgy is widely used to produce alloys with low cost of production. The
main drawback using powders is the level of residual porosity of final product which often implies
the application of a complicated and costly hot isostatic pressing process. However, this issue can
be overcome by using equal channel angular pressing (ECAE) with back pressure (BP). The use of
severe shear deformation, with imposed hydrostatic pressure, allows a reduction in the range of
compaction temperatures compare to those used in conventional practice.
The compaction of Ti-6Al-4V powder by the ECAE method has been investigated. The
compaction has been performed at temperatures starting from room temperature (RT) and
increasing up to 400°C with various back pressures ranging from 0 to 350MPa. A billet processed
by ECAE with 43MPa back-pressure at 400°C was found to have improved relative density of
97.5% and increased Vickers hardness of 369HV, compared to values of 96.7% and 325HV
respectively obtained at RT. A relative density of 98.2% and 426HV hardness were measured for
billets processed with BP = 262MPa at 400°C. A fully compact billet was obtained by applying
350 MPa of BP at 400°C. |
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