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Low-temperature compaction of Ti-6Al-4V powder using equal channel angular extrusion with back pressure

Lapovok, R., Tomus, D. and Muddle, B. C. 2008, Low-temperature compaction of Ti-6Al-4V powder using equal channel angular extrusion with back pressure, Materials science and engineering a, vol. 490, no. 1-2, pp. 171-180, doi: 10.1016/j.msea.2008.01.075.

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Title Low-temperature compaction of Ti-6Al-4V powder using equal channel angular extrusion with back pressure
Author(s) Lapovok, R.
Tomus, D.
Muddle, B. C.
Journal name Materials science and engineering a
Volume number 490
Issue number 1-2
Start page 171
End page 180
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2008-08-25
ISSN 0921-5093
Keyword(s) Ti-6Al-4V alloy
powder compaction
equal channel angular extrusion
back pressure
pores
density
Summary Equal channel angular extrusion (ECAE), with simultaneous application of back pressure, has been applied to the consolidation of 10 mm diameter billets of pre-alloyed, hydride-dehydride Ti-6Al-4V powder at temperatures ≤400 °C. The upper limit to processing temperature was chosen to minimise the potential for contamination with gaseous constituents potentially harmful to properties of consolidated product. It has been demonstrated that the application of ECAE with imposed hydrostatic pressure permits consolidation to in excess of 96% relative density at temperatures in the range 100-400 °C, and in excess of 98% at 400 °C with applied back pressure ≥175 MPa. ECAE compaction at 20 °C (back pressure = 262 MPa) produced billet with 95.6% relative density, but minimal green strength. At an extrusion temperature of 400 °C, the relative density increased to 98.3%, for similar processing conditions, and the green strength increased to a maximum 750 MPa. The relative density of compacts produced at 400 °C increased from 96.8 to 98.6% with increase in applied back pressure from 20 to 480 MPa, while Vickers hardness increased from 360 to 412 HV. The key to the effective low-temperature compaction achieved is the severe shear deformation experienced during ECAE, combined with the superimposed hydrostatic pressure.
Language eng
DOI 10.1016/j.msea.2008.01.075
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2008, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30075997

Document type: Journal Article
Collection: Institute for Frontier Materials
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