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

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dc.contributor.author Mathabathe, M.N.
dc.contributor.author Govender, S.
dc.contributor.author Bolokang, A.S.
dc.contributor.author Mostert, R.J. (Roelf)
dc.contributor.author Siyasiya, Charles Witness
dc.date.accessioned 2018-06-01T06:06:00Z
dc.date.issued 2018-08
dc.description.abstract The 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.department Materials Science and Metallurgical Engineering en_ZA
dc.description.embargo 2019-08-15
dc.description.librarian hj2018 en_ZA
dc.description.sponsorship Department of Science and Technology (DST) and Council of Scientific Industrial Research (CSIR). en_ZA
dc.description.uri http://www.elsevier.com/locate/jalcom en_ZA
dc.identifier.citation Mathabathe, 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.issn 0925-8388 (print)
dc.identifier.issn 1873-4669 (online)
dc.identifier.other 10.1016/j.jallcom.2018.05.051
dc.identifier.uri http://hdl.handle.net/2263/65054
dc.language.iso en en_ZA
dc.publisher Elsevier en_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.subject X-ray diffraction (XRD) en_ZA
dc.subject Lamellar structure en_ZA
dc.subject Microstructural evolution en_ZA
dc.subject Scanning and transmission electron microscopy (SEM/TEM) en_ZA
dc.subject High temperature differential thermal analysis (HTDTA) en_ZA
dc.subject γ-TiAl based alloy en_ZA
dc.subject Phase transformation en_ZA
dc.subject Solidification en_ZA
dc.subject Heat-treatment en_ZA
dc.subject Differential thermal analysis (DTA) en_ZA
dc.title Phase transformation and microstructural control of the α-solidifying γ-Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy en_ZA
dc.type Postprint Article en_ZA


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