A5071804455- Additive Manufacturing Materials and Processes
- High Entropy Alloys Studies
- Metal and Thin Film Mechanics
- Titanium Alloys Microstructure and Properties
- High-Temperature Coating Behaviors
- Additive Manufacturing and 3D Printing Technologies
- Intermetallics and Advanced Alloy Properties
- Advanced materials and composites
- Welding Techniques and Residual Stresses
- Metal Alloys Wear and Properties
- Aluminum Alloys Composites Properties
- Laser Material Processing Techniques
- Bone Tissue Engineering Materials
- Laser and Thermal Forming Techniques
- Advanced machining processes and optimization
- Surface Treatment and Coatings
- MXene and MAX Phase Materials
- Advanced ceramic materials synthesis
- Advanced Surface Polishing Techniques
- Advanced Materials Characterization Techniques
- Tribology and Lubrication Engineering
- Metallurgy and Material Forming
- Laser-induced spectroscopy and plasma
- Surface Treatment and Residual Stress
- Tunneling and Rock Mechanics
Council for Scientific and Industrial Research
2015-2024
Tshwane University of Technology
2015-2024
University of Johannesburg
2017-2020
Council of Scientific and Industrial Research
2011-2016
University of Pretoria
2015
University of the Witwatersrand
2007-2011
National Metrology Institute of South Africa
2008
Vaal University of Technology
2007
University of Sussex
1993-1994
Hydroxyapatite (HAP) coatings on bioinert metals such as Ti-6Al-4V are necessary for biomedical applications. Together, HAP and biocompatible bioactive. The challenges of depositing with traditional thermal spraying techniques well founded. In this paper, was coated using direct laser melting (DLM) process. This process, unlike the coating processes, is able to achieve good metallurgical bonding little dilution. microstructural mechanical properties, chemical composition bio-activities...
Using a focused ion beam TTX-NHT3 Nanoindentation tester with load of 500 mN, we study the micromechanical properties laser-deposited AlCoCrFeNiCu high entropy alloy coatings. The indentation tests conducted were used to examine influence laser power and scan speed on elastic modulus hardness coatings using Oliver & Pharr method. There several points impressed extract mechanical alloys, results compared that A301 steel substrate. showed mean value NanoHardness Elastic 2.769 GPa 149 GPa,...
For making metallic products through Additive Manufacturing (AM) processes, laser-based systems play very significant roles. Laser-based processes such as Selective Laser Melting (SLM) and Engineered Net Shaping (LENS) are dominating while Laminated Object (LOM) has also been used. The paper will highlight key issues without going into details try to present comparative pictures of the aforementioned processes. included machine, materials, applications, comparison, various possibilities future works.
This paper reports the effect of laser power density on evolving properties metal deposited titanium alloy. A total sixteen experiments were performed, and microstructure, microhardness surface roughness samples studied using optical microscope (OP), indenter stylus analyzer, respectively. The microstructure changed from finer martensitic alpha grain to coarser Widmastätten structure as was increased. results show that higher employed, smoother obtained surface. initially increased then...
The NiTi intermetallic possesses a number of good properties, such as high wear, oxidation, and corrosion resistance. This paper focuses on the deposition coatings Ti6Al4V substrate by laser melting Ti Ni elemental powder mixtures. effect varying content in composition microstructure wear properties was investigated. were characterized scanning electron microscope (SEM) equipped with Energy Dispersive Spectroscope (EDS). performed under accelerated dry sliding tests. results obtained from...
AlCrFeNiCuWx high entropy alloys were fabricated on 316 L stainless steel substrate using laser metal deposition technique. The microstructural and mechanical characteristics of these studied by advanced characterization techniques. results revealed that the exhibited a dual phase structure with BCC (body centered cubic) FCC (face solid solution phases. presence tungsten (W) particles in HEA matrix changed shape grains from columnar to aquiaxed. contained W possessed higher plasticity at...
Second-harmonic generation (SHG) has been successfully performed in ion-implanted planar waveguides KTiOPO4. The were formed by helium implantation, and SHG was achieved using type 2 zero order mode phase matching at a wavelength of ∼1.07 μm. results indicate that the high nonlinearity material remains guiding region after ion implantation. conversion efficiency typical guide is estimated ∼25% for ∼1 μJ pulsed excitation. At lower input power level, harmonic green output from waveguide 20...
An Nd:YAG laser was used for surface alloying of aluminum AA1200. The powder a mixture Ni and SiC in different ratios. A study the microstructures obtained after conducted using optical scanning electron microscopy. Energy-dispersive X-ray (EDX) diffraction (XRD) were phase identification. Analysis alloyed layer revealed presence Al4C3, AlNi3, α-Al-Si eutectic phases. particles dissociated into Si C. C reacted with Al to form Al4C3. addition resulted formation Al3Ni phase. hardness increase...