Browsing PhD / Doctoral by Department "Centre for Materials Engineering"

Now showing items 1-20 of 22

The abrasive wear behaviour of mineral-filled polypropylene

Author: Sole, Brian Michael Date: 1997 Polypropylene is an extremely versatile polymer because its properties can be modified to meet specific requirements. The use of polypropylene in domestic and automobile applications has initiated research focused on the tribological behaviour ... Read more
Aspects of serrated flow in aluminium alloys

Author: Robinson, Jonathan Mark Date: 1992 Uniaxial tensile testing has been undertaken on a range of aluminium base alloys. Material investigated included commercial binary Al-Mg (5182), ternary Al-Mg-Si (6061) and quaternary Al-Cu-Mn-Si (2014) as well as experimental alloys containing ... Read more
The brittle and plastic response of quartz.

Author: Glover, Graham John Date: 1980 Quartz is the principal mineral constituent of the earth's upper crust and a knowledge of the deformation characteristics of quartz are of geological and technological importance. In common with many ceramic materials, quartz may not satisfy ... Read more
Corrosion fatigue of engineering alloys in aqueous environments

Author: Harty, Brian Dudley Date: 1990 A comparative study of the fatigue crack growth rate (FCGR) behaviour of five alloys in air and in aqueous environments has been performed. The alloys tested include: mild steel as a reference material, a corrosion resistant dual phase steel, ... Read more
The development of abrasive-corrosive wear resistance of steels by microstructural control

Author: Barker, Keith Cecil Date: 1988 The performance of developmental alloyed steels with improved abrasive-corrosive wear resistant properties has been evaluated. The synergistic effect of abrasion and corrosion in the accelerated wear of steels is examined and the main parameters ... Read more
Ductility in high chromium super-ferritic alloys

Author: Wolff, Ira M Date: 1989 The competition between microfracture and plastic flow has been studied in relation to the thermomechanical processing parameters and minor element chemistry of wrought super-ferritic alloys based on a composition of Fe-40wt% Cr. These alloys ... Read more
The effect of drawing strain on the fatigue behaviour of stainless and carbon steel wires

Author: Topic, Miroslav Date: 2001 A study has been made of the fatigue crack initiation and fatigue crack growth behaviour of three different steels in wire form, namely, an austenitic AISI 304 stainless steel, a corrosion resistant ferritic steel, 3CR12, and pearlitic high ... Read more
The erosion of titanium aluminide intermetallic alloys

Author: Howard, Robert Llewellyn Date: 1995 The erosion behaviour of titanium aluminide intermetallic alloys has not been widely reported in the scientific literature and is part of the current international research effort aimed at exploiting these materials for turbine engine and ... Read more
The flocculation of kaolin with polyacrylamides

Author: Paterson, Adrian Date: 1982 Flocculation occurs when high molecular mass organic molecules form bridges between particles, causing them to aggregate. This modifies the sedimentation properties of the mineral slurry. Thus classical measures of flocculation, among them ... Read more
The fracture and autogenous comminution of quartzite

Author: Kanellopoulos, Achilles Constantine Date: 1978 Comminution is the process which aims at increasing the surface area and the resultant liberation of a particular constituent from the mass of a solid. The autogenous mill uses tumbling to effect comminution, but instead of special milling ... Read more
High temperature erosive wear of a boiler tube steel

Author: Suckling, Martin Brian Date: 1997 This work is an attempt to evaluate the influence of critical operational parameters on the high temperature erosion of a 1Cr½Mo boiler tube steel. Erosion testing has been carried out in a specially designed and developed unique laboratory ... Read more
The influence of microstructure on electrical resistivity in palladium alloys

Author: Lang, Candace Irene Date: 1993 The relationship between microstructure and electrical resistivity has been studied in palladium-tungsten and palladium-molybdenum alloys, which exhibit an anomalous increase in resistivity after annealing. The effect of dislocations and ... Read more
Micromechanisms of polymer sliding wear

Author: Marcus, Kashif Date: 1993 A study has been made concerning the tribological behaviour of ultrahigh molecular weight polyethylene (UHMWPE) during water-lubricated reciprocating sliding wear. The experimental work has been extended to study also the effect of molecular ... Read more
Microstructural and structural stability of rapidly solidified gold-titanium alloys

Author: Van Heerden, David Peter Date: 1993 An investigation has been carried out into the effect of rapid solidification on the microstructure and structural order present in dilute Au-Ti alloys, and the subsequent evolution of these properties on post-solidification heat treatment. ... Read more
A microstructural examination of duplex ferrite -martensite corrosion resisting steels

Author: Knutsen, Robert Douglas Date: 1989 This thesis reports a study of the microstructural evolution of chromium containing duplex ferrite-martensite steels and examines the effects of the microstructure on the mechanical properties. Emphasis has been placed on determining the ... Read more
A microtexture based analysis of surface roughening in ductile metals during tensile deformation

Author: Wittridge, Nicola Janette Date: 1998 This thesis examines the cause and mechanism for the occurrence of parallel surface ridges during the deformation of two specific ductile metal alloys, namely AISI 430 ferritic stainless steel and an aluminium alloy designated AA3002. The ... Read more
The milling of tin bronze with a Cu-24.6wt%Sn composition

Author: Williams, Garth Date: 1997 The effects of high energy milling on tin bronze with the composition Cu-24.6wtSn have been examined using hardness testing, optical microscopy, scanning electron microscopy, transmission electron microscopy and x-ray diffraction. High energy ... Read more
The Pt₈V ordering transformation in Pt 11 at. % V

Author: Nxumalo, Silethelwe Date: 2006 The Pt₈V ordering transformation in Pt 11 qt.% V alloys has been studied. The study included determining the thermodynamic stability of Pt₈V, the kinetics of Pt₈V ordering transformation and the strengthening due to the presence of the ordered ... Read more
The static and dynamic fracture of brittle materials

Author: Payne, Basil Wolf Date: 1977 Experiments on the behaviour of brittle materials, particularly quartz, during the initial period of loading, at the onset of fracture and during the stage of rapid crack propagation, have been performed in order to gain an insight into some ... Read more
The synthesis of beta alumina powders

Author: Van Zyl, Arnold Date: 1987 Beta alumina solid electrolyte material is conventionally synthesized by the high temperature solid state reaction of α-Al₂O₃ with soda and a stabilizer ion such as lithia or magnesia. This reaction requires a reconstructive transformation ... Read more