Phase transformation and microstructural control of the α-solidifying γ-Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

dc.contributor.authorMathabathe, Maria Ntsoaki
dc.contributor.authorGovender, S.
dc.contributor.authorBolokang, A.S.
dc.contributor.authorMostert, Roelf Johannes
dc.contributor.authorSiyasiya, Charles Witness
dc.date.accessioned2018-06-01T06:06:00Z
dc.date.issued2018-08
dc.description.abstractThe γ-Ti-45Al-2Nb-0.7Cr-0.3Si based intermetallic alloy was developed. Microstructure evolution of the as-cast and heat-treated alloy yielded the spheriodised and Widmanstätten laths. High temperature differential thermal analysis (HTDTA) was performed on the as-cast Ti-45Al-2Nb-0.7Cr-0.3Si alloy in order to determine critical temperatures and provide insight into phase transformations prior heat treatment. The morphology of the alloy was analysed by the optical microscopy, scanning and transmission electron microscopy (SEM/TEM). The SEM was equipped with energy dispersion spectroscopy (EDS) for chemical composition. The EBSD mapping was employed to determine microstructural evolution. The results show that after heat-treatment the homogeneous microstructures were obtained, compared to the dendritic as-cast structure. The spheriodised laths were seen embedded inside the lamellar structure; whereas the Widmanstätten laths were observed as crossed/needle like (α2+γ) laths of small spacing, with a spatial orientation with respect to the lamellar structure. The structural development was determined by the X-ray diffraction (XRD).en_ZA
dc.description.departmentMaterials Science and Metallurgical Engineeringen_ZA
dc.description.embargo2019-08-15
dc.description.librarianhj2018en_ZA
dc.description.sponsorshipDepartment of Science and Technology (DST) and Council of Scientific Industrial Research (CSIR).en_ZA
dc.description.urihttp://www.elsevier.com/locate/jalcomen_ZA
dc.identifier.citationMathabathe, M.N., Govender, S., Bolokang, A.S. et al. 2018, 'Phase transformation and microstructural control of the α-solidifying γ-Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy', Journal of Alloys and Compounds, vol. 757, pp. 8-15.en_ZA
dc.identifier.issn0925-8388 (print)
dc.identifier.issn1873-4669 (online)
dc.identifier.other10.1016/j.jallcom.2018.05.051
dc.identifier.urihttp://hdl.handle.net/2263/65054
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2018 Elsevier B.V. Notice : this is the author’s version of a work that was accepted for publication in Journal of Alloys and Compounds. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Journal of Alloys and Compounds, vol. 757, pp. 8-15, 2018. doi : 10.1016/j.jallcom.2018.05.051.en_ZA
dc.subjectX-ray diffraction (XRD)en_ZA
dc.subjectLamellar structureen_ZA
dc.subjectMicrostructural evolutionen_ZA
dc.subjectScanning and transmission electron microscopy (SEM/TEM)en_ZA
dc.subjectHigh temperature differential thermal analysis (HTDTA)en_ZA
dc.subjectγ-TiAl based alloyen_ZA
dc.subjectPhase transformationen_ZA
dc.subjectSolidificationen_ZA
dc.subjectHeat-treatmenten_ZA
dc.subjectDifferential thermal analysis (DTA)en_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.subject.otherEngineering, built environment and information technology articles SDG-13
dc.subject.otherSDG-13: Climate action
dc.titlePhase transformation and microstructural control of the α-solidifying γ-Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloyen_ZA
dc.typePostprint Articleen_ZA

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