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Browsing by Author "Siyasiya, CW"

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Formation of amorphous Ti-50at.%Pt by solid state reactions during mechanical alloying

Author: Mahlatji, ML ; Chikosha, S ; Chikwanda, HK ; Stumpf, WE ; Siyasiya, CW Date: Oct 2013 Mechanical alloying of an equiatomic mixture of crystalline elemental powders of Ti and Pt in a high-energy ball mill results in formation of an amorphous alloy by solid-state reactions. Mechanical alloying was carried out in an argon atmosphere ... Read more
Heat treatment response and characterization of Ti6Al4V + xMo produced by laser metal deposition

Author: Arthur, Nana KK ; Siyasiya, CW ; Pityana, Sisa L ; Tlotleng, Monnamme Date: Jan 2022 During the laser metal deposition additive manufacturing processing of Ti6Al4V ELI alloy, the parts produced were exposed to high levels of thermal gradients, which resulted from rapid heating and cooling rates in the material. This had an ... Read more
Investigation of network microstructure of TiB/Ti6Al4V-ELI composite manufactured with laser metal deposition

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Siyasiya, CW ; Masina, Bathusile N Date: May 2023 This work presents the microstructural investigation of an in situ synthesized TiB/Ti6Al4V-ELI composite that was manufactured with additive manufacturing (AM) technique known as laser metal deposition (LMD). A single-track sample was ... Read more
Material characteristics of Ti-6AL-4V samples additively manufactured using laser-based direct energy deposition

Author: Willemse, MG ; Siyasiya, CW ; Marais, D ; Venter, AM ; Arthur, Nana KK Date: Feb 2023 Although additive manufacturing is fast gaining traction in the industrial world as a reputable manufacturing technique to complement traditional mechanical machining, it still has problems such as porosity and residual stresses in components ... Read more
Phase transformation and microstructural control of the a-solidifying -Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Author: Mathabathe, Maria N ; Govender, Gonasagren ; Bolokang, Amogelang S ; Mostert, RJ ; Siyasiya, CW Date: May 2018 The -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 ... Read more
Phase transformation and microstructural control of the a-solidifying -Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Author: Mathabathe, Maria N ; Govender, Gonasagren ; Bolokang, Amogelang S ; Mostert, RJ ; Siyasiya, CW Date: Aug 2018 The -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 Widmanstatten laths. High temperature differential thermal analysis (HTDTA) was ... Read more
Powder characteristics blending and microstructural analysis of a hot-pack rolled vacuum arc-melted γ-tial-based sheet

Author: Ellard, John JM ; Mathabathe, Maria N ; Siyasiya, CW ; Bolokang, Amogelang S Date: Nov 2022 In the quest for cost-effective fabrication processes capable of producing sound γ-TiAl products, the microstructure and mechanical properties of a modified second-generation hot-rolled γ-TiAl-based alloy with nominal composition Ti-48Al-2N ... Read more
Shape memory properties and transformation temperature of Ti50-XVXPt50 alloy

Author: Daswa, Pfarelo ; Chikosha, Silethelwe ; Siyasiya, CW Date: Jun 2021 Improvement of functional properties of binary TiPt shape memory alloy by adding a third element to partially substitute for Ti, has to date resulted in a decreased martensitic transformation temperature. In this study, the effect of substituting ... Read more
Structure-property orientation relationship of a /a2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Author: Mathabathe, Maria S ; Bolokang, Amogelang S ; Govender, Gonasagren ; Mostert, RJ ; Siyasiya, CW Date: Oct 2018 Structure-property relationship of the as-cast -Ti-45Al-2Nb-0.7Cr-0.3Si based intermetallic alloy was examined. The phases stable at room temperature in the alloy were /a(sub)2/Ti(sub)5Si(sub)3, respectively; while their crystal structures ... Read more
Surface characterization of the cyclically oxidized -Ti-48Al-2Nb-0.7Cr alloy after nitridation

Author: Mathabathe, Maria N ; Govender, Gonasagren ; Siyasiya, CW ; Mostert, RJ ; Bolokang, Amogelang S Date: Aug 2019 Surface properties of the nitrided -Ti-48Al-2Nb-0.7Cr intermetallic alloy after cyclic oxidation was characterized. The nitride coating was successfully deposited after annealing of the Ti-48Al-2Nb-0.7Cr intermetallic alloy at 900 °C under ... Read more
The vacuum melted y-TiAl (Nb, Cr, Si)-doped alloys and their cyclic oxidation properties

Author: Mathabathe, Maria N ; Bolokang, Amogelang S ; Govender, Gonasagren ; Mostert, RJ ; Siyasiya, CW Date: Aug 2018 The y-TiAl intermetallic alloy doped with Nb, Cr, and Si metals has been developed. It has emerged that the ternary Ti-48Al-2Nb and quinary Ti-48Al-2Nb-0.7Cr-0.3Si alloys yielded the best mechanical and cyclic oxidation properties. In particular, ... Read more

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Browsing by Author "Siyasiya, CW"

Browsing by Author "Siyasiya, CW"

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