https://ujcontent.uj.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 Mineralogical and leaching characteristics of altered ilmenite beach placer sands https://ujcontent.uj.ac.za/vital/access/manager/Repository/uj:41443 Wed 24 Feb 2021 20:09:19 SAST ]]> Mineralogical and leaching characteristics of altered ilmenite beach placer sands https://ujcontent.uj.ac.za/vital/access/manager/Repository/uj:40586 Tue 24 Nov 2020 17:45:43 SAST ]]> A comparative study of spark plasma sintering and hybrid spark plasma sintering of W-4.9ni-2.1Fe heavy alloy https://ujcontent.uj.ac.za/vital/access/manager/Repository/uj:20793 99.2%) close to the theoretical density. Phase, microstructure and mechanical properties evolution of W-Ni-Fe alloy during SPS and HSPS were studied. The microstructural evolution of the 60 mm alloys varied from the edge of the sample to the core of the sample. Results show that the grain size and the hardness vary considerable from the edge to the core of sintered sample of 60 mm sintered using conventional SPS compared to hybrid SPS. Similarly, the hardness also increased from the edge to the core. The 60 mm-HSPS alloy exhibit improved bending strength than the 60 mm-SPS, 1115 MPa and 920 MPa respectively, former being similar to the 30 mm-SPS and HSPS alloys. The intergranular fracture along the W/W grain boundary is the main fracture modes of W-Ni-Fe, however in the 60 mm-SPS alloy peeling of the grains was also observed which diminished the properties. The mechanical properties of SPS and HSPS 93W-4.9Ni-2.1Fe heavy alloys are dependent on the microstructural parameters such as tungsten grain size and overall homogeneity.]]> Thu 22 Aug 2019 20:12:48 SAST ]]>