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2D numerical model for heat transfer on a laser deposited high entropy alloy baseplate using Comsol Multiphysics

Author: Dada, A ; Popoola, P ; Mathe, Ntombizodwa R ; Adeosun, S ; Aramide, O Date: Dec 2021 In an optimization study, cracks were observed in the microstructures of laser-deposited HEAs on a steel baseplate from residual stresses, thus, the optimization of crack-free microstructures was achieved by the optimization of the laser ... Read more
Addition of Chromium and its effect on the microstructure and mechanical properties of laser- coated high carbon ferrochrome alloy on mild steel

Author: Aramide, BP ; Popoola, P ; Sadiku, R ; Jamiru, T ; Pityana, Sisa L Date: Aug 2021 Laser cladding is an additive manufacturing technology that can be utilized in surface strengthening, modification, and repair of components that are subjected to adverse working conditions. This can be accomplished by the addition of ... Read more
Anomaly detection monitoring system for healthcare

Author: Boloka, Tlou J ; Crafford, Gerhardus J ; Mokuwe, Mamuku W ; Van Eden, Beatrice Date: Jan 2021 Most developing countries suffer from inadequate health care facilities and a lack of medical practitioners as most of them emigrate to developed countries. The outbreak of the COVID-19 pandemic has left these countries more vulnerable to ... Read more
The Circular Economy as Development Opportunity: Exploring Circular Economy Opportunities across South Africa’s Economic Sectors

Author: Godfrey, Linda K ; Nahman, Anton ; Oelofse, Suzanna HH ; Trotter, Douglas ; Khan, Sumaya ; Nontso, Zintle ; Magweregwede, Fleckson ; Sereme, Busisiwe V ; Okole, Blessed N ; Gordon, Gregory ER ; Brown, Bernadette ; Pillay, Boyse ; Schoeman, Chanel ; Fazluddin, Shahed ; Ojijo, Vincent O ; Cooper, Antony K ; Kruger, Daniel M ; Napier, Mark ; Mokoena, Refiloe ; Steenkamp, Anton J ; Msimanga, Xolile P ; North, Brian C ; Seetal, Ashwin R ; Mathye, Salamina M Date: Dec 2021 The intention of this book is to present the CSIR’s position and interpretation of the circular economy, and to use it to drive discussions on where immediate circular economy opportunities are achievable in South Africa. Opportunities that ... Read more
The combination of low level laser therapy and efavirenz drastically reduces HIV infection in TZM-bl cells

Author: Lugongolo, Masixole Y ; Manoto, Sello L ; Ombinda-Lemboumba, Saturnin ; Maaza, M ; Mthunzi-Kufa, Patience Date: Jun 2020 Human immunodeficiency virus (HIV) infection remains a global health challenge despite the use of antiretroviral therapy, which has led to a significant decline in the mortality rates. Owing to the unavailability of an effective treatment to ... Read more
The comparative study of the microstructural and corrosion behaviour of laser-deposited high entropy alloys

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, S ; Aramide, O Date: Jun 2021 Corrosion is a conservational occurrence that has a large economic impact on most metals and its alloys because it destroys and deteriorates most materials by an electrochemical process through the reaction of these materials with the ... Read more
Coupled heat transfer, fluid flow and solidification kinetics for laser additive manufacturing applications

Author: Khomenko, MD ; Makoana, Nkutwane W ; Pityana, Sisa L ; Mirzade, FKH Date: Jul 2021 A new coupled heat transfer and solidification kinetics model is developed for the optimization of microstructure during laser additive manufacturing applications. The Johnson–Mehl–Avrami–Kolmogorov equation is applied in a self-consistent ... Read more
Crack mitigation in laser engineered net shaping of WC-10wt%FeCr cemented carbides

Author: Molobi, E ; Sacks, N ; Theron, Maritha Date: Apr 2022 Laser engineered net shaping of a WC-10wt%FeCr cemented carbide showed cracking during deposition despite using a full factorial design of experiments matrix along with single and multiple objective optimization models to establish an optimal ... Read more
Detection of mycobacterium tuberculosis using gold nanoparticles conjugated to TB antibodies

Author: Maphanga, Charles P ; Manoto, Sello L ; Ombinda-Lemboumba, Saturnin ; Mthunzi-Kufa, Patience Date: Mar 2021 In recent years, conjugated nanoparticles have gained significant applications in diagnostics, particularly gold nanoparticles (AuNPs). When functionalized with antibodies, AuNPs can selectively interact with cells and biomolecules. The ... Read more
Development of ideal processing parameters for powder bed fusion system processing of AlSi10Mg using design of experiments

Author: Mathe, Ntombizodwa R Date: Aug 2021 The additive manufacturing of aluminium alloys has gained great interest in the transport industry in the past 10 years. This is mainly due to the lightweight and good strength that these alloys offer especially for applications in aerospace ... Read more
Effect of laser cladding processing parameters on nitinol’s clad dimensions, microstructure, and hardness

Author: Zain, EM ; Youssef, AF ; Sabbagh, AEI ; Pityana, Sisa L ; Taha, MA Date: Dec 2021 Nickel Titanium alloy (Nitinol) is characterized by its good mechanical properties, good damping properties in addition to its distinctive shape-memory effect and superelasticity effect besides its great bio-mechanical compatibility and ... Read more
The effect of laser surface re-melting on the surface roughness and micro-hardness of selective laser melting (SLM) fabricated Ti-6Al-4V samples

Author: Molatlhegi, G ; Hoosain, Shaik ; Popoola, API ; Malatji, N ; Pityana, Sisa L Date: Oct 2021 Ti-6Al-4V is favourable due to its exquisite properties for example, low modulus, light weight, excellent strength, and corrosion resistance. Despite the excellent properties of the material, the fabrication process of titanium components is ... Read more
Effect of LSP parameters on the corrosion and hardness properties of TI6Al4V

Author: Kubjane, SM ; Arthur, Nana KK ; Masina, Bathusile N ; Popoola, API ; Pityana, Sisa L Date: Sep 2019 Because of its low density, high corrosion resistance and high strength to weight ratio, titanium and its alloys are widely used in aerospace applications. As a result, the material is exposed to detrimental environment. An enhancement in ... Read more
The effect of porosity on the mechanical properties of Ti-6Al-4V components manufactured by high-power selective laser melting

Author: Mathe, Ntombizodwa R ; Tshabalala, Lerato C ; Hoosain, Shaik ; Motibane, Londiwe P ; Du Plessis, A Date: Jul 2021 Metal powder bed fusion in additive manufacturing is gaining interest as a manufacturing technique for complex metal parts in the aerospace, rail, and automotive industries. This has led to an emergence of 3D printers in the market to accelerate ... Read more
The effect of solution treatment on the microstructure and mechanical properties of as-cast Ti-Mo alloys

Author: Moshokoa, Nthabiseng ; Raganya, Mampai L ; Obadele, BA ; Olubambi, PA ; Machaka, Ronald Date: 2020 The present study investigates the effect of solution treatment on the microstructure and mechanical properties of as-cast Ti-Mo alloys. The two alloys (Ti-8Mo and Ti-9Mo) were fabricated using a commercially available Arc re-melting furnace. ... Read more
Effects of laser shock peening on the mechanisms of fatigue short crack initiation and propagation of AA7075-T651

Author: Sanchez, AG ; You, C ; Leering, M ; Glaser, Daniel ; Furfari, D ; Fitzpatrick, ME ; Wharton, J ; Reed, PAS Date: Nov 2020 A laser shock peening (LSP) treatment was performed on AA7075-T651 for maximum fatigue improvement. Surface and microstructural characterisation techniques (micro-hardness, SEM-EBSD, contact-profilometry) showed LSP surface modification was ... Read more
Effects of substrate heating on the microstructure and hardness of TiB/Ti6Al4V-ELI during laser in-situ metal deposition

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Masina, Bathusile N Date: Dec 2021 This work investigated the influence of heating temperature (°C) on the microstructure and microhardness of TiB/Ti6Al4V-ELI composite clads that were produced via in-situ alloying using laser metal deposition technique. The samples were ... Read more
The effects of surface pits and intermetallics on the competing failure modes in laser shock peened AA7075-T651: Experiments and modelling

Author: You, C ; Sanchez, AG ; Leering, M ; Glaser, Daniel ; Furfari, D ; Fitzpatrick, ME ; Wharton, J ; Reed, PAS Date: Sep 2021 The effects of laser shock peening (LSP) on the fatigue life of AA7075-T651 were investigated. The combined influence of surface imperfections (i.e. pits and intermetallics), compressive residual stresses (CRS) and the applied stress on crack ... Read more
Evaluation of heat treatment parameters on microstructure and hardness properties of high-speed selective laser melted Ti6Al4V

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Annan, K ; Maledi, N ; Masina, Bathusile N Date: Feb 2021 This study presents the investigation on how heat treatment parameters, which are temperature, cooling method, and residence time, influence the microstructural and hardness properties of Ti6Al4V components produced on Ti6Al4V substrate using ... Read more
Evaluation of laser shock peening process parameters incorporating Almen strip deflections

Author: Glaser, Daniel ; Polese, C ; Venter, AM ; Marais, D ; Plaisier, JR Date: Mar 2022 Engineering of component surfaces using Laser Shock Peening (LSP) requires optimisation of key process parameters to enhance performance through the generation of beneficial compressive residual stresses. Quantification of residual stress ... Read more

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