The effect of hydrogenation on the ECAP compaction of Ti–6Al–4V powder and the mechanical properties of compacts

Lapovok, Rimma, Tomus, D., Skripnyuk, V.M., Barnett, Matthew and Gibson, M.A. 2009, The effect of hydrogenation on the ECAP compaction of Ti–6Al–4V powder and the mechanical properties of compacts, Materials science and engineering A: structural materials: properties, microstructures and processing, vol. 513-514, pp. 97-108.

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Title The effect of hydrogenation on the ECAP compaction of Ti–6Al–4V powder and the mechanical properties of compacts
Author(s) Lapovok, Rimma
Tomus, D.
Skripnyuk, V.M.
Barnett, Matthew
Gibson, M.A.
Journal name Materials science and engineering A: structural materials: properties, microstructures and processing
Volume number 513-514
Start page 97
End page 108
Total pages 12
Publisher Elsevier
Place of publication Basel, Switzerland
Publication date 2009-07-15
ISSN 0921-5093
1873-4936
Keyword(s) Ti–6Al–4V powder
ECAP compaction
hydrogen temporary alloying
Summary The effect of hydrogen content on the compaction of Ti–6Al–4V powder at low temperatures, namely 500 °C, using equal channel angular pressing (ECAP) with back pressure has been investigated. The properties of the compacts before and after a heat treatment and de-hydrogenation cycle have been determined. Compaction of powder by ECAP (500 °C and 260 MPa) has shown maximum levels of relative density of 99.3% and 99.4% when charged with 0.05–0.1 wt.% and 0.61–0.85 wt.% of hydrogen, respectively. After the de-hydrogenation heat treatment the diffusion bonding between individual powder particles was completed and the microstructure was altered, depending on the level of hydrogen content. Two local maxima of 99.2% and 98.1% were observed in the measured density of consolidated compacts for hydrogen contents between 0.05 wt.% and 0.1 wt.% and between 0.61 wt.% and 0.85 wt.%, respectively. However, the mechanical properties of the compacts within these two ranges of hydrogen content were significantly different due to a difference in the observed microstructure. An exceptionally high ductility of 29%, in combination with a relatively high strength of ~560 MPa, was measured in a shear punch test on specimens which had a prior hydrogen level of 0.05 wt.% before the heat treatment. It was shown that material consolidated from powder hydrogenated to low levels of hydrogen before compaction has the potential to offer substantial improvements in mechanical properties after a suitable heat treatment.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861199 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
HERDC collection year 2009
Copyright notice ©2009, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30022571

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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