Cold-pressing and vacuum arc melting of γ-TiAl based alloys
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Date
Authors
Mathabathe, Maria Ntsoaki
Bolokang, A.S.
Govender, G.
Siyasiya, Charles Witness
Mostert, Roelf Johannes
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Beta (β) solidifying γ-TiAl intermetallic alloys of nominal composition Ti-48Al, Ti-48Al-2Nb, Ti-48Al-2Nb-0.7Cr alloys have been cold pressed and vacuum arc melted. The Al loss was due to compaction method used prior to the melting technique, since it was evident after compaction that Al particles migrated to the surface in contact with the die facets after cold pressing. Electron backscatter diffraction (EBSD)-orientation mapping demonstrated that the α-precipitation from the parent β-phase follows the Blackburn orientation relationship (BOR). Microstructural characterization of the alloys was studied by scanning electron microscopy (SEM) equipped with energy dispersion spectroscopy (EDS) for micro-analysis. X-ray diffraction (XRD) technique was used to detect phase compositions.
Description
Keywords
Aluminum alloys, Binary alloys, Chromium alloys, Compaction, Melting, Scanning electron microscopy (SEM), Ternary alloys, Titanium alloys, Vacuum applications, Vacuum technology, Cold pressing, Micro-structural characterization, Orientation mapping, Phase domain, TiAl-based alloys, Vacuum arc melting, Niobium alloys, Electron backscatter diffraction (EBSD), Blackburn orientation relationship (BOR), Energy dispersion spectroscopy (EDS), X-ray diffraction (XRD)
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Citation
Mathabathe, M.N., Bolokang, A.S., Govender, G. et al. 2019, 'Cold-pressing and vacuum arc melting of γ-TiAl based alloys', Advanced Powder Technology, vol. 30, no. 12, pp. 2925-2939.