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Browsing by Author "Mathe, Ntombizodwa R"

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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
Characterization of gas atomized Ti-6Al-4V powders for additive manufacturing

Author: Tshabalala, Lerato C ; Mathe, Ntombizodwa R ; Chikwanda, HIlda K Date: May 2018 In this paper, titanium powders from various sources were characterized to compare powder integrity for additive manufacturing by selective laser melting process. Selective laser melting by powder-bed based Additive Manufacturing (AM) is an ... 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
Design and simulation of a bearing housing aerospace component from titanium alloy (TI6AL4V) for additive manufacturing

Author: Oyesola, M ; Mpofu, K ; Daniyan, I ; Mathe, Ntombizodwa R Date: Dec 2022 In evaluating emerging technology, such as additive manufacturing, it is important to analyse the impact of the manufacturing process on efficiency in an objective and quantifiable manner. This study deals with the design and simulation of a ... Read more
Development of an integrated design methodology model for quality and throughput of Additive Manufacturing processes

Author: Oyesola, MO ; Mpofu, K ; Mathe, Ntombizodwa R ; Danisyam, I Date: May 2019 Additive manufacturing (AM) has risen to be a substantial part of modern manufacturing due to its unique capabilities and has already been fondly adopted in various fields especially in the aerospace. In order to fully harness the benefits ... 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 parameters on the properties of high entropy alloys: A preliminary study

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, S Date: May 2020 This preliminary study investigates the fabrication of Al-Co-Cr-Fe-Ni-Cu and Al-Ti-Cr-Fe-Co-Ni High Entropy Alloys with the Laser Deposition Technique. The effect of the laser parameters on the microstructure and hardness properties of the ... 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
Effect of powder bed preheating on distortion and mechanical properties in high speed selective laser melting

Author: Motibane, Londiwe P ; Tshabalala, Lerato C ; Mathe, Ntombizodwa R ; Hoosain, Shaik E ; Knutsen, RD Date: Oct 2019 Selective Laser Melting (SLM) is known to cause residual stresses due to the inherent large thermal gradients from high heating and cooling rates during manufacturing. The residual stresses tend to induce distortion, delamination of parts ... Read more
The effect of reducing agents on the electronic, magnetic and electrocatalytic properties of thiol-capped Pt/Co and Pt/Ni nanoparticles

Author: Mathe, Ntombizodwa R ; Nkosi, SS ; Motaung, DE ; Scriba, Manfred R ; Coville, NJ Date: May 2015 The electronic, magnetic and electrocatalytic properties of bimetallic thiol-capped Pt/Co and Pt/Ni nanoparticles were synthesised using two reducing agents, NaBH(sub4) and N(sub2)H(sub4). X-ray diffraction analysis of the nanoparticles showed ... Read more
The effect of selective laser melting build orientation on the mechanical properties of AlSi10Mg parts

Author: Mfusi, BJ ; Tshabalala, Lerato C ; Popoola, API ; Mathe, Ntombizodwa R Date: Oct 2018 Additive manufacturing is currently applied across a broad material selection and it is growing in production volume and economic impact. Aluminium is one of the materials that play a significant role in the aerospace industry because of its ... Read more
Electrical resistivity and oxidation behavior of Cu and Ti doped laser deposited high entropy alloys

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, S Date: Sep 2022 In this study, AlCoCrFeNi–Cu (Cu-based) and AlCoCrFeNi–Ti (Ti-based) high entropy alloys (HEAs) were fabricated using a direct blown powder technique via laser additive manufacturing on an A301 steel baseplate for aerospace applications. The ... Read more
Electropolishing of additively manufactured Ti-6Al-4V surfaces in nontoxic electrolyte solution

Author: Tsoeunyane, GM ; Mathe, Ntombizodwa R ; Tshabalala, Lerato C ; Makhatha, ME Date: May 2022 The reduction of surface roughness on additively manufactured components has become a critical factor in engineering applications. This paper reports the electropolishing of additively manufactured Ti-6Al-4V by powder bed selective laser ... Read more
An experimental investigation of selective laser process parameters on aluminium alloy (AlSi12)

Author: Nzengue, AGB ; Mpofu, K ; Mathe, Ntombizodwa R ; Daniyan, I ; Muvunzi, Ra Date: Jul 2023 The chase for sustainable manufacturing that contributes to addressing climate change is of research interest across scientists and industrial sectors. The lightweight and high strength properties of aluminium alloys foster sustainable cost, ... Read more
Fabrication and hardness behaviour of high entropy alloys

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, A ; Lengopeng, Thabo Date: Feb 2020 Laser additive manufacturing is a direct energy deposition process which manufactures components from 3D model data in progressive layers until a whole part is built as opposed subtractive manufacturing. However, during the procedure, the ... Read more
High entropy alloys for aerospace applications

Author: Dada, M ; Popoola, P ; Adeosun, S ; Mathe, Ntombizodwa R Date: Sep 2019 In the aerospace industry, materials used as modern engine components must be able to withstand extreme operating temperatures, creep, fatigue crack growth and translational movements of parts at high speed. Therefore, the parts produced must ... Read more
High entropy alloys for aerospace applications

Author: Dada, M ; Popoola, P ; Adeosun, S ; Mathe, Ntombizodwa R Date: Sep 2019 In the aerospace industry, materials used as modern engine components must be able to withstand extreme operating temperatures, creep, fatigue crack growth and translational movements of parts at high speed. Therefore, the parts produced must ... Read more
In-situ reactive synthesis and characterization of a high entropy alloy coating by laser metal deposition

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, S Date: Mar 2022 In this study, we investigate the influence of in situ reactive synthesis of Ti6Al4V– AlCoCrFeNiCu high entropy alloys by laser metal deposition on the microstructural and mechanical properties of the as-built alloy as opposed to the traditional ... Read more
Influence of stress relieving thermal cycles on AISI10 Mgspecimens produced by selective laser melting

Author: Mfusi, Busisiwe J ; Mathe, Ntombizodwa R ; Popoola, Patricia A ; Tshabalala, Lerato C Date: Oct 2019 The AlSi10Mg alloy is known for its castability, corrosion resistance, high heat conductivity, low weight and good weldability. The applications of the aluminium alloy components includes heat exchangers that are subjected to high temperatures ... Read more
Influence of Ti and Cu on the corrosion properties of laser-deposited high entropy alloys

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, S ; Dlamini, Thembisile P ; Aramide, O Date: Nov 2021 In this study, AlCoCrFeNiCu (Cu-based) and AlCoCrFeNiTi (Ti-based) high entropy alloys were fabricated using laser additive manufacturing. The influence of the alloying elements and the laser processing parameters, the laser power and scanning ... Read more

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