Hydrostatic compression behavior and high-pressure stabilized β-phase in γ-based titanium aluminide intermetallics

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dc.contributor.authorLiss, KDen_AU
dc.contributor.authorFunakoshi, Ken_AU
dc.contributor.authorDippenaar, RJen_AU
dc.contributor.authorHigo, Yen_AU
dc.contributor.authorShiro, Aen_AU
dc.contributor.authorReid, Men_AU
dc.contributor.authorSuzuki, Hen_AU
dc.contributor.authorShobu, Ten_AU
dc.contributor.authorAkita, Ken_AU
dc.date.accessioned2016-07-25T02:09:27Zen_AU
dc.date.available2016-07-25T02:09:27Zen_AU
dc.date.issued2016-07-15en_AU
dc.date.statistics2016-07-25en_AU
dc.description.abstractTitanium aluminides find application in modern light-weight, high-temperature turbines, such as aircraft engines, but suffer from poor plasticity during manufacturing and processing. Huge forging presses enable materials processing in the 10-GPa range, and hence, it is necessary to investigate the phase diagrams of candidate materials under these extreme conditions. Here, we report on an in situ synchrotron X-ray diffraction study in a large-volume press of a modern (α2 + γ) two-phase material, Ti-45Al-7.5Nb-0.25C, under pressures up to 9.6 GPa and temperatures up to 1686 K. At room temperature, the volume response to pressure is accommodated by the transformation γ → α2, rather than volumetric strain, expressed by the apparently high bulk moduli of both constituent phases. Crystallographic aspects, specifically lattice strain and atomic order, are discussed in detail. It is interesting to note that this transformation takes place despite an increase in atomic volume, which is due to the high ordering energy of γ. Upon heating under high pressure, both the eutectoid and γ-solvus transition temperatures are elevated, and a third, cubic β-phase is stabilized above 1350 K. Earlier research has shown that this β-phase is very ductile during plastic deformation, essential in near-conventional forging processes. Here, we were able to identify an ideal processing window for near-conventional forging, while the presence of the detrimental β-phase is not present under operating conditions. Novel processing routes can be defined from these findings. © 2016, The Authorsen_AU
dc.identifier.citationLiss, K. D., Funakoshi, K. I., Dippenaar, R.J., Higo, Y., Shiro, A., Reid, M., Suzuki, H., Shobu, T., & Akita, K. Hydrostatic compression behavior and high-pressure stabilized β-phase in γ-based titanium aluminide intermetallics. Metals 2016, 6, 165. doi:10.3390/met6070165en_AU
dc.identifier.govdoc6879en_AU
dc.identifier.issn2075-4701en_AU
dc.identifier.issue7en_AU
dc.identifier.journaltitleMetals 2016en_AU
dc.identifier.pagination165en_AU
dc.identifier.urihttp://dx.doi.org/10.3390/met6070165en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7217en_AU
dc.identifier.volume6en_AU
dc.language.isoenen_AU
dc.publisherMultidisciplinary Digital Publishing Instituteen_AU
dc.subjectPressure range mega pa 10-100en_AU
dc.subjectTemperature range 0400-1000 Ken_AU
dc.subjectPhase transformationsen_AU
dc.subjectPlasticityen_AU
dc.subjectIntermetallic compoundsen_AU
dc.subjectSynchrotron radiationen_AU
dc.titleHydrostatic compression behavior and high-pressure stabilized β-phase in γ-based titanium aluminide intermetallicsen_AU
dc.typeJournal Articleen_AU
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