Processing, microstructure and high strain rate behaviour of Ti-6Al-4V Alloy produced from a blended mixture using powder compact extrusion

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dc.contributor.authorSingh, Ajit Palen_NZ
dc.contributor.authorGabbitas, Brianen_NZ
dc.contributor.authorYang, Feien_NZ
dc.contributor.authorTorrens, Roben_NZ
dc.date.accessioned2017-11-03T01:05:24Z
dc.date.available2016en_NZ
dc.date.available2017-11-03T01:05:24Z
dc.date.issued2016en_NZ
dc.description.abstractPowder compact extrusion (PCE) is an innovative way of processing titanium and titanium alloys to produce good-quality material with a wide range of compositions, microstructures and mechanical properties. This paper explores PCE processing of Ti-6Al-4V alloy prepared from a blended powder mixture, containing elemental hydride-dehydride (HDH) titanium powder and master alloy (60Al-40V) powder. The warm pressed compacts of blended powders were sintered using a vacuum sintering furnace prior to β extrusion. The resulting material was used to measure the performance under high strain rate and tri-axial stress state using Charpy v-notch testing. A comparison was made of the microstructure after vacuum sintering and hot extrusion in addition to oxygen measurements to determine the degree of oxygen pickup during each processing stage. A comprehensive study of fracture surfaces in selected samples was carried out using optical microscopy and scanning electron microscopy. Based on the results, it is clear that certain samples picked up varying amounts of interstitial impurities during processing and as a consequence a significant number of micro-cracks were observed in lamellar type microstructures. The oxygen content of all as-extruded samples was between 0.34-0.44 wt.% with resultant impact toughness in the range of 10-14 J. The best impact toughness attained for the lowest oxygen as-extruded rods was 20% lower than the literature values for wrought material. In terms of fracture behaviour, ductile dimples, cleavage facets and cracks passing through lamellar structures were observed in all samples. However, the quantity of these fracture features varied significantly in each sample.
dc.format.mimetypeapplication/pdf
dc.identifier.citationSingh, A. P., Gabbitas, B., Yang, F., & Torrens, R. (2016). Processing, microstructure and high strain rate behaviour of Ti-6Al-4V Alloy produced from a blended mixture using powder compact extrusion. Key Engineering Materials, 704, 413–422. https://doi.org/10.4028/www.scientific.net/KEM.704.413en
dc.identifier.doi10.4028/www.scientific.net/KEM.704.413en_NZ
dc.identifier.issn1013-9826en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11457
dc.language.isoen
dc.publisherTrans Tech Publicationsen_NZ
dc.relation.isPartOfKey Engineering Materialsen_NZ
dc.rightsThis is an author’s accepted version of an article published in the journal: Key Engineering Materials. © 2016 Trans Tech Publications.
dc.subjectBlended powder metallurgy
dc.subjectTi-6Al-4V alloy
dc.subjectimpurity oxygen
dc.subjectmicro-cracking
dc.subjectimpact toughness
dc.subjectfracture behavior
dc.titleProcessing, microstructure and high strain rate behaviour of Ti-6Al-4V Alloy produced from a blended mixture using powder compact extrusionen_NZ
dc.typeJournal Article
pubs.begin-page413
pubs.elements-id139259
pubs.end-page422
pubs.notesQA: http://www.ttp.net/1013-9826.htmlen_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/2018 PBRF
pubs.organisational-group/Waikato/FSEN
pubs.organisational-group/Waikato/FSEN/2018 PBRF - FSEN
pubs.organisational-group/Waikato/FSEN/School of Engineering
pubs.organisational-group/Waikato/FSEN/School of Engineering/2018 PBRF - School of Engineering
pubs.user.infoYang, Fei (fyang@waikato.ac.nz)
pubs.user.infoTorrens, Robert (torrens@waikato.ac.nz)
pubs.user.infoSingh, Ajit Pal (apalsing@waikato.ac.nz)
pubs.volume704en_NZ
uow.verification.statusverified
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