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250 results on '"Shongwe, Mxolisi"'

15. Spark Plasma Sintering of Ceramic Matrix Composite of TiC: Microstructure, Densification, and Mechanical Properties: A Review

Author

Oguntuyi, Samson Dare, Johnson, Oluwagbenga, Shongwe, Mxolisi Brendon, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, di Mare, Francesca, Series Editor, Awang, Mokhtar, editor, and Emamian, Seyed Sattar, editor

Published
2021
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17. Investigation into Process Parameter Optimization of Selective Laser Melting for Producing AlSi12 Parts Using ANOVA.

Author

Kekana, Neo, Shongwe, Mxolisi Brendon, Mpofu, Khumbulani, and Muvunzi, Rumbidzai

Subjects
SELECTIVE laser melting, EXPERIMENTAL design, ANALYSIS of variance, MANUFACTURING processes, RESPONSE surfaces (Statistics), HARDNESS
Abstract

In this study, AlSi12 alloy samples were produced via the selective laser melting (SLM) technique to produce high-density components with complex and customized parts for railway applications. Nonetheless, the production of dense samples necessitates the optimization of production process parameters. As a statistical design of the experimental method, response surface methodology was applied to optimize different combinations of SLM parameters. The outcomes were analyzed via analysis of variance (ANOVA) and signal-to-noise(S/N) ratios. The relationship between the hardness response to the process parameters (scanning speed and laser power) for determining the optimal processing conditions were examined. A hardness value of 133 HV was obtained. The process parameters were successfully optimized and the relationship between the parameters and the structures of the fabricated samples were reported. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Spark plasma sintered Ti-35Nb-7Zr-5Ta-1Cu alloy

Author

Nkuna Tinyiko Rose, Teffo Linda Moipone, Shongwe Mxolisi Brendon, and Machaka Ronald

Subjects
ti-alloy, biomaterials, microstructures, crystallography electrochemical analysis, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Beta-titanium alloys composed of non-toxic and non-allergic alloying elements are the material of choice for biomedical applications. The effects of Cu addition and heat treatment on the microstructural evolution and phase transformation of Ti-35Nb-7Zr-5Ta alloys were thoroughly investigated. The spark plasma sintering (SPS) was used to fabricate Ti-35Nb-7Zr-5Ta with a micro-addition of 1 wt.% Cu. Field Emission Scanning Electron Microscopy (FE-SEM) and X-ray diffractometry (XRD) were used to investigate microstructural evolution and phase transformation. Microstructures obtained include a predominant BCC β-phase and a two-phase area (α+β) with a large grain boundary of β-phase without the intermetallic phase, implying a positive effect on the mechanical properties of the alloy. The sintered alloys exhibited excellent corrosion resistance and may be suitable candidates for biomaterial applications.

Published
2023
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