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Showing 1 to 20 of 69 for “"TN Mining engineering. Metallurgy"”.
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Effect of stress on initiation and propagation of localized corrosion in alumninium alloys
… as the possible key contributing factor in determining the corrosion properties of the alloy under stressed conditions. In situ X-ray synchrotron microtomography experiments were used to observe the evolution of corrosion attack as a function of continuous exposure time in both unstressed and …
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Studies of the magnetic properties and microstructures of two rare earth-transition metal type magnetic alloys
An investigation into the optimisation of magnetic properties of two types of magnetic alloys based on Sm(Co,Cu,Fe,Zr)\(_z\) (z = 7.4) and Nd\(_{15}\)Fe\(_{77}\)B\(_8\) has been carried out. The optimum heat treatment which gave the best magnetic properties for the Sm(Co,Cu,Fe,Zr)\(_z\) alloy …
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Application of microstructural texture parameters to diffusional and displacive transformation products
The measurement of materials properties and the control of processing parameters is important for both materials development and quality control. Determination of these parameters is sometimes advantageous if done by means of microstructural characterisation as here additional information may be …
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Determination of metal quality of aluminium and its alloys
Aluminium alloy castings are being used increasingly in safety-critical applications in the automotive and aerospace industries. To produce castings of sufficient quality, it is, therefore, important to understand the mechanisms of the formation of defects in aluminium melts, and important to have …
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Effects of deformations on corrosion of Al-Mn alloys
Wrought Al-Mn alloys can develop a thin deformed layer on the surface as a result of hot and cold rolling. Subsequent heat-treatment precipitates fine secondary intermetallic particles which effect corrosion susceptibility. This work focuses on the effect of surface preparation and deformation on …
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Effects of oxide film, Fe-rich phase, porosity and their interactions on tensile properties of cast Al-Si-Mg alloys
Since mechanical properties of cast Al-Si-Mg alloys are directly influenced by microstructural defects, understanding the characteristics of these defects and any interactions between them is important for improving the properties of castings. This research studied the effect of the most common …
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Crystal growth of functional oxides using an image furnace
The present study is concerned with the single crystal growth of functional oxides by the floating zone technique using a four mirror image furnace. This thesis attempts to extend our knowledge of the subject by firstly studying the optical floating zone method as a technique in terms of the …
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Improving performance of discharge equipment for coals with poor handling characteristics
The accepted design techniques for bulk solids handling equipment are frequently overlooked during the installation of industrial process plants. As a result, flow unreliability is often observed in silos in the form of flow stoppages, product bulk density variations, formation of rat-holes, …
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The crystallisation of Poly (aryl ether etherketone) (PEEK) and its carbon fibre composites
… (PEEK) is a semi-crystalline, high-performance engineering polymer whose properties can be enhanced through fibre reinforcement. The properties of PEEK and its composites are sensitive to changes in the crystalline content and morphology, which are influenced by the processing conditions. As …
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The low temperature fracture behaviour of the super duplex stainless steel Zeron 100
The micromechanisms of fracture in an austenitic/ferritic super-duplex stainless steel (Zeron 100) have been studied for a range of product forms, including cross-rolled plate, conventional (ingot) route and powder route extruded pipe, hot isostatically pressed (HIP'd) powder, and weldments …
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Passive materials for high frequency piezocomposite ultrasonic transducers
High frequency ultrasound is receiving increased attention for medical imaging in areas such as ophthalmology and dermatology. Recent advances in the manufacture of fine scale piezocomposite materials mean there is great potential for commercial transducers far superior to conventional devices …
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The application of positron emission particle tracking to study non-metallic inclusions in metal castings
To improve the efficiency of turbine aero engines, higher operating temperatures and weight savings are being investigated. Alloys such as RR1000 are being trialled as they perform better at higher temperatures than current nickel-based superalloys. To achieve weight savings, inertia welding is …
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Statistical modelling of the transition toughness properties of low alloy pressure vessel steels
The transition toughness of low alloy steels used in pressure vessels is of key importance to establishing the safe operation of a number of structures; of these, the integrity of a nuclear reactor vessel is of greatest concern. The through life toughness of such vessels is a combination of the …
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Fabrication of 316-L stainless steel and composite micro machine components using softlithography and powder metallurgy process
… materials, using Softlithography and powder metallurgy processes. Three different 316-L stainless steel powders, including 5, 10 and 16 μm in size, and two different ceramics powders, including 400 nm alumina and 320 nm titania, were tested. The PhD research process can be divided into three …
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The corrosion of CoCrMo alloys for biomedical applications
CoCrMo alloys have been used for biomedical implants for a number of years. They are now frequently used for the metal-on-metal hip resurfacing joints due to their high corrosion and wear performance. The present project was carried out to investigate the feasibility of taking electrochemical …
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Microstructure property development in friction stir welds of aluminim based alloys
Friction Stir Welding (FSW) is known to result in a complex microstructural development, with features that remain unexplained, such as: the formation of the onion rings structure. Moreover, various microstructural factors have been suggested to control the strength in Al-Mg AA5xxx welds. The …
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Microstructural analysis of aluminium alloy 2096 as a function of heat treatment.
A detailed microstructural investigation into possible metallurgical culprits of stress corrosion cracking (SCC) of Al-Li-Cu alloy AA2096 was carried out as a function of isothermal aging time at 160°C. Two tempers were analysed for this study: under-aged at 4 hours (UA4) and under-aged at 12 hours …
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Development of bimodal grain structures and their effect on toughness in HSLA steel
To understand the formation of bimodal ferrite grain structures (i.e. mixed coarse + fine grain sizes) in TMCR HSLA steel plates, as-continuously cast HSLA steel slabs with varying microalloying additions (Ti, Nb and V) were reheated to temperatures in the range 1000-1300 °C and deformed at 1110 °C …
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The industrial development of transparent conducting coatings by a Sol-Gel route
… the work was performed with a supply chain partnership to facilitate commercial uptake. Sol-gel technology was used to facilitate direct printing of patterned layers. Precursors were selected and a processing route developed. Values for glass transition and crystallization temperature were …
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The effect of post weld heat treatment on the corrosion behaviour of a AA2050T34-FSW
The corrosion behaviour of a AA2050T34-FSW was examined as a function of post weld heat treatment condition. Immersion tests in 0.1 M Nac1 and G110 intergranular tests were performed and the corrsion morphology and the depth of attacks in the different regions of the weld were investigated using …
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