Rozprawy doktorskie: „Aluminium alloys”

1

Nafisi, Shahrooz. "Effects of grain refining and modification on the microstructural evolution of semi-solid 356 alloy = Effets de l'affinage des grains et de la modification sur l'évolution microstructurale de l'alliage 356 semi-solide /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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2

Saoudi, Abdelhamid. "Prédiction de la rupture par fatigue dans les pièces automobiles en alliages aluminium /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2008. http://theses.uqac.ca.

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Thèse (D.Eng.) -- Université du Québec à Chicoutimi, 2008.
La p. de t. porte en outre: Doctorat en ingénierie, thèse pour l'obtention du titre de Philosophiae Doctor en ingénierie. CaQQUQ Comprend des réf. bibliogr. (f. 174-178). Publié aussi en version électronique. CaQQUQ

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3

Mohamed, Adel. "Effet des additifs sur la microstructure et les propriétés mécaniques des alliages d'aluminium-silicium /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2008. http://theses.uqac.ca.

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Thèse (D.Eng..) -- Université du Québec à Chicoutimi, 2008.
La p. de t. porte en outre: Thèse présenté[e] à l'Université du Québec à Chicoutimi comme exigence partielle du doctorat en ingénierie. CaQQUQ Comprend des réf. bibliogr. (f. [292]-314). Publié aussi en version électronique. CaQQUQ

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4

El, Sebaie Ossama. "L'effet de l'addition du "mischmetal", du taux de refroidissement et du traitement thermique sur la microstructure et la dureté des alliages Al-Si de type 319, 356, et 413 = Effect of mischmetal, cooling rate and heat treatment on the microstructure and hardness of 319, 3456, and 413 Al-Si alloys /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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5

Matthews, Stephen John. "Cavitation erosion of aluminium alloys, aluminium alloy/ceramic composites and ceramics". Thesis, Coventry University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317927.

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6

Golbahar, Behnam. "Effect of grain refiner-modifier interaction on the performance of A356.2 alloy". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2008. http://theses.uqac.ca.

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Thèse (M.Eng.) -- Université du Québec à Chicoutimi, 2008.
La p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en ingénierie. CaQQUQ Comprend des réf. bibliogr. (f. 149-155). Publié aussi en version électronique. CaQQUQ

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7

Yang, Deyu. "Rôle d'addition de magnésium sur l'occurence de la fonte naissante dans les alliages expérimentaux et commerciaux Al-Si-Cu et son influence sur la microstructure et les propriétés de traction de l'alliage = Role of magnesium addition on the occurence of incipient melting in experimental and commercial Al-Si-Cu alloys and its influence on the alloy microstructure and tensile properties /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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8

Blanchette, Hugues. "Développement d'un système de contrôle de qualité pour les lopins d'aluminium semi-solide[s] obtenus avec le procédé SEED /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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9

Wilson, G. R. "Surface studies of aluminium and aluminium alloys". Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377646.

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10

Bhattacharya, Victoria. "Study Of Friction And Wear Behaviour Of Nano-Embedded Aluminium Alloys". Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/190.

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In general, the bearing alloys have two types of microstructure i.e., either a soft matrix with discrete hard particles or a continuous matrix of the harder metal with small amount of the softer metal finely dispersed in it. The aluminium and copper based bearing alloys which are widely studied fall in the second category. However, the bearing materials which have been studied have micron sized dispersoids. In recent times, it is possible to produce nanoscale dispersoids in a hard matrix by the novel processing route of rapid solidification. This offers an opportunity to study the small length scale effect on tribological processes. In this thesis, we deal with aluminium alloys where nanoscaled dispersions of lead, bismuth and indium are produced by rapid solidification processing. Chapter 1 of the thesis is an introduction, followed by Chapter 2, which reviews the literature on nanomaterials. Special attention is given to the monotectic system, followed by a brief description on friction and wear of materials which is necessary for our present investigation. The details of experimental and characterisation techniques are given in Chapter 3. In Chapter 4, we present a brief study of white metal bearings (babbit). Tin-based babbit of composition, Sn-6wt% Cu-llwt% Sb was studied. The study of babbit was mainly carried out with the idea that it could serve as a benchmark for subsequent studies in aluminium alloys, in terms of tribological properties. In particular, we have carried out a detailed electron microscopic investigation on the phases present in the bearing alloy. The friction and wear behaviour of this material confirms the proper calibration of our setup for wear studies. This is followed by a detailed study on the synthesis, microstructure and tribological behaviour of nanodispersed aluminium alloys, Al-6wt% Pb and Al-10wt% Pb in Chapter 5. For comparison, we have also studied melt-spun aluminium without dispersoids. Detailed electron microscopic characterisation indicates that lead has a cube on cube orientation relationship with the aluminium matrix, and the particles exhibit a lognormal distribution with the mode of the particle size distribution being 15 nm. The pin on disc results suggest a distinct lowering of coefficient of friction corresponding to pure aluminium (μ= 0.40) and as cast aluminium-lead alloys (μ= 0.41). Detailed SEM studies indicate a tribolayer consisting primarily of Al, Pb and Fe. The later comes from the counterface material. Our results clearly indicate that at an early stage, little or no oxidation takes place at the sliding interface. TEM observations indicate significant deformation of lead particles in the sub-surface region. The observations suggest spreading of the lead, which acts as a lubricating layer. Wear behaviour is primarily adhesive and follows Archard's wear law. However, the rate of wear is less than that reported by other investigators on micronsized lead dispersions in aluminium. In Chapter 6, we present the results for alloys dispersed with nanosized indium and bismuth. We show that indium particles on melt-spinning exhibit both cubic and tetragonal crystal structure. The indium particles are coarser (with a mode of 25 nm) than the lead and bismuth particles (which have mode of 15nm). The bismuth containing alloys have a lower wear rate and coefficient of friction compared to lead and indium alloys. However, both indium and bismuth particles do not follow Archard's wear law and the wear vs load graph shows a non-linear behaviour. The results are discussed in terms of known mechanisms of the coefficient of friction and wear. Chapter 7 gives the salient conclusions while in Chapter 8 we discuss some of the unanswered questions and the potential for future work in this field.

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11

Bhattacharya, Victoria. "Study Of Friction And Wear Behaviour Of Nano-Embedded Aluminium Alloys". Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/190.

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In general, the bearing alloys have two types of microstructure i.e., either a soft matrix with discrete hard particles or a continuous matrix of the harder metal with small amount of the softer metal finely dispersed in it. The aluminium and copper based bearing alloys which are widely studied fall in the second category. However, the bearing materials which have been studied have micron sized dispersoids. In recent times, it is possible to produce nanoscale dispersoids in a hard matrix by the novel processing route of rapid solidification. This offers an opportunity to study the small length scale effect on tribological processes. In this thesis, we deal with aluminium alloys where nanoscaled dispersions of lead, bismuth and indium are produced by rapid solidification processing. Chapter 1 of the thesis is an introduction, followed by Chapter 2, which reviews the literature on nanomaterials. Special attention is given to the monotectic system, followed by a brief description on friction and wear of materials which is necessary for our present investigation. The details of experimental and characterisation techniques are given in Chapter 3. In Chapter 4, we present a brief study of white metal bearings (babbit). Tin-based babbit of composition, Sn-6wt% Cu-llwt% Sb was studied. The study of babbit was mainly carried out with the idea that it could serve as a benchmark for subsequent studies in aluminium alloys, in terms of tribological properties. In particular, we have carried out a detailed electron microscopic investigation on the phases present in the bearing alloy. The friction and wear behaviour of this material confirms the proper calibration of our setup for wear studies. This is followed by a detailed study on the synthesis, microstructure and tribological behaviour of nanodispersed aluminium alloys, Al-6wt% Pb and Al-10wt% Pb in Chapter 5. For comparison, we have also studied melt-spun aluminium without dispersoids. Detailed electron microscopic characterisation indicates that lead has a cube on cube orientation relationship with the aluminium matrix, and the particles exhibit a lognormal distribution with the mode of the particle size distribution being 15 nm. The pin on disc results suggest a distinct lowering of coefficient of friction corresponding to pure aluminium (μ= 0.40) and as cast aluminium-lead alloys (μ= 0.41). Detailed SEM studies indicate a tribolayer consisting primarily of Al, Pb and Fe. The later comes from the counterface material. Our results clearly indicate that at an early stage, little or no oxidation takes place at the sliding interface. TEM observations indicate significant deformation of lead particles in the sub-surface region. The observations suggest spreading of the lead, which acts as a lubricating layer. Wear behaviour is primarily adhesive and follows Archard's wear law. However, the rate of wear is less than that reported by other investigators on micronsized lead dispersions in aluminium. In Chapter 6, we present the results for alloys dispersed with nanosized indium and bismuth. We show that indium particles on melt-spinning exhibit both cubic and tetragonal crystal structure. The indium particles are coarser (with a mode of 25 nm) than the lead and bismuth particles (which have mode of 15nm). The bismuth containing alloys have a lower wear rate and coefficient of friction compared to lead and indium alloys. However, both indium and bismuth particles do not follow Archard's wear law and the wear vs load graph shows a non-linear behaviour. The results are discussed in terms of known mechanisms of the coefficient of friction and wear. Chapter 7 gives the salient conclusions while in Chapter 8 we discuss some of the unanswered questions and the potential for future work in this field.

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12

Park, Sungbae. "Rheocasting of aluminium alloys". Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670041.

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13

Gustafsson, Sofia. "Corrosion properties of aluminium alloys and surface treated alloys in tap water". Thesis, Uppsala universitet, Institutionen för materialkemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-157527.

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The aim of this thesis is to obtain a basic knowledge of the factors that affect corrosion of aluminium in tap water for different kinds of applications like water pipes for tap water, solar systems, HVAC&R-applications (like fan coil units on chillers) and heat sinks for electronic or industrial applications. Open systems are used in some applications and closed systems in others. There is a clear difference in the corrosion behaviour of these two systems. The main reasons for this difference are that the content of oxygen differs between the two systems and also that inhibitors can be used in closed systems to hinder corrosion. In this thesis focus will be on corrosion in open systems. The corrosion properties in tap water for different alloys of aluminium and different surface treatments have been examined. The influences on corrosion of the oxygen content in water and the iron content in aluminium alloys have been investigated. The corrosion properties of an aluminium alloy in deionised water have also been examined.

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14

Turner, Michael. "Brush plating of bearing alloys on aluminium alloy shells". Thesis, Aston University, 1986. http://publications.aston.ac.uk/11919/.

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The turbocharging of diesel engines has led to increase in temperature, load and corrosive attack of plain bearings. To meet these requirements, overlay plated aluminium alloys are now preferred. Currently, lead-tin alloys are deposited using a zincate layer and nickel strike, as intermediate stages in the process. The nickel has undesirable seizure characteristics and the zincate can given rise to corrosion problems. Consequently, brush plating allows the possible elimination of these stages and a decrease in process together with greater automation. The effect of mode application, on the formation of zincate films, using film growth weight measurements, potential-time studies, peel adhesion testing and Scanning Electron Microscopy was studied, for both SIC and AS15 aluminium alloys. The direct plating of aluminium was also successfully achieved. The results obtained indicate that generally, although lower adhesion resulted when a brush technique was used, satisfactory adhesion for fatigue testing was achieved. Both lead-tin and tin-cobalt overlays were examined and a study of the parameters governing brush plating were carried out using various electrolytes. An experimentally developed small scale rig, was used to produce overlay plated bearings that were fatigue tested until failure. The bearings were then examined and an analysis of the failure mechanisms undertaken. The results indicated that both alloy systems are of the regular codeposition type. Tin-cobalt overlays were superior to conventional lead-tin overlays and remained in good condition, although the lining (substrate) failed. Brush plated lead-tin was unsatisfactory. Sufficient understanding has now been gained, to enable a larger scale automated plant to be produced. This will allow a further study of the technique to be carried out, on equipment that more closely resembles that of a full scale production process.

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15

Ammar, Hany. "Effet des imperfections de la coulée sur les propriétés en fatigue des alliages de fonderie aluminium silicium = Effect of casting imperfections on the fatigue properties of aluminum-silicon casting alloys /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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16

Di, Sabatino Marisa. "Fluidity of Aluminium Foundry Alloys". Doctoral thesis, Norwegian University of Science and Technology, Department of Materials Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1735.

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The fluidity of an alloy plays a key role for the foundry and transport industries as it affects the quality and soundness of the cast products. Particularly, fluidity influences the reject rates, hence casting costs and the production of thinwalled, hence light components. Fluidity is a complex technological property and depends on many parameters. However, many aspects of this subject are still not fully understood. The motivation of the research presented in this doctoral thesis was, therefore, to fill this gap in knowledge. The study has aimed at understanding the influence of various parameters on the fluidity of aluminium foundry alloys and, in particular, Al-Si foundry alloys.

A literature review of previously reported results on fluidity was carried out. It was found that a lack of a highly reproducible test method as well as some contradictory results existed in the literature. Therefore, a new fluidity test method was developed. To study the accuracy and reproducibility of this test was one of the goals of this work. The new test method allowed a constant melt superheat, which is considered as one of the major factors affecting fluidity measurements, and a constant pouring velocity. It was found that the reproducibility of the new method was higher than previous methods.

The effect of casting temperature, and hence melt superheat, was assessed through a series of tests. A linear relationship between casting temperature and fluidity length was observed.

The effect of grain refiner on the fluidity of an A356 alloy was systematically investigated. The fluidity lengths without grain refiner and with three additions of Al-5wt%Ti-1wt%B master alloy were measured. The results showed that grain refinement reduced the grain size throughout the spiral somewhat, particularly at the tip, but there were no statistically significant effects on fluidity.

The effect of dissolved hydrogen was also investigated in this study. The hydrogen content was drastically increased by plunging pieces of wood beneath the surface of the molten metal. The fluidity of this melt was measured and compared to a melt with low hydrogen content. It was concluded that the difference in fluidity between the melts with different hydrogen levels was not significant.

The effect of minor alloying elements (Sr, Ti, Fe and Mg) on the fluidity of Al-7wt%Si alloys was investigated. The Design Of Experiment (DOE) technique and the Taguchi approach were used to design the experiments. The Analysis Of Variance (ANOVA) was performed to analyse the results. It was concluded that the addition of minor alloying elements to a major alloy system, e.g. Al-7wt%Si, does not significantly affect its fluidity and the melt superheat had a far greater impact on fluidity than the minor alloying elements.

The effect of mould coating on fluidity was studied on a commercial strip mould which consisted of a H13 die with five channels of different cross sectional areas. The coating was sprayed to achieve a thickness of 0.2mm. Fluidity measurements were performed on the uncoated and coated mould. It was concluded that mould coating significantly increases fluidity. In addition, fluidity measurements on the uncoated and coated mould were undertaken at two different melt superheats and it was found that coating the mould plays a more significant role at low melt superheats.

The effect of oxide content on fluidity was also investigated. Three alloys, namely a standard A356 alloy, the same alloy with 20% (A356+20%) and 50% (A356+50%) re-melted turning chips, were used and their fluidities compared. Qualitative analysis on the type of oxides present in the three alloys was carried out with a PoDFA test apparatus and the oxide level was quantified with optical microscopy analysis. The results showed that the addition of turning chips significantly increased the oxide content. Among the investigated alloys, A356 without turning chip additions showed the lowest oxide content and the highest fluidity. No significant differences in either oxide content or fluidity were found between the A356+20% and A356+50% melts.

Two fluidity test methods, a commercially available one and an experimentally developed test, were used for measuring the fluidity of Al-Mg-Si alloys. Although the two methods were different, they gave consistent results.

Numerical simulations of fluidity tests were carried out on an A356 alloy and the results showed that numerical simulation software can be a useful tool for predicting fluidity in aluminium foundry alloys.

These are the major findings achieved by this thesis work which contribute to improve our understanding of the effect of several key variables on fluidity. It is believed that these results will solve some of the problems currently encountered in foundries and improve their processes.

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17

Forsman, Tomas. "Laser welding of aluminium alloys /". Luleå, 2000. http://epubl.luth.se/1402-1544/2000/39/index.html.

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18

Yoon, Jong Won. "Laser welding of aluminium alloys". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343303.

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19

Grant, Patrick S. "Spray forming of aluminium alloys". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302790.

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20

Etheridge, Andrea Mary. "Conversion coatings on aluminium alloys". Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307051.

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21

Monaghan, David. "Twin roll cast aluminium alloys". Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357441.

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22

Allen, C. M. "Nucleation studies in aluminium alloys". Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388896.

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23

Dudgeon, Helen D. "Fatigue of aluminium-lithium alloys". Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276536.

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Deekhunthod, Rujira Ninni. "Weld Quality in Aluminium Alloys". Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226136.

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The aims of this project are to present an understanding in what happens when aluminium-(Al) alloys are welded, and to investigate how the Mg-, Si- and Cr-contents in AA6005A influence the weld strength and cracking susceptibility. It is known that heat from welding affects the mechanical properties (strength) of the material. Different heat cycles during welding are one of the main reasons that the strength varies. Welding can cause various phenomena such as decreased strength, porosity, deformation, cracks and corrosion. To minimize these phenomena one has to have a balance between the welding parameters, alloy composition and welding fixture setup. Al alloys are sensitive to heat from welding because they have high heat conductivity and high thermal expansion coefficient. They also deform easily when the material is heated locally. If the material is deformed too much then cracking easily occurs. This project has examined how the Mg-, Si- and Cr-contents in AA6005A, affect the welded material. A V-joint with MIG welding is used for producing weld samples. For evaluation Vickers micro-hardness, tensile testing, radiography (X-ray), LOM and SEM with EBSD and EDS was used. The evaluation focuses on mechanical properties and microstructure. The results show that small variations of Mg-, Si- and Cr-content do not have any clear effects on the welded material. The results from tensile testing show that all samples have failed in the heat affected zone (HAZ). The tensile strength of all samples are higher than standard but the yield strength are lower than standard (EN ISO 10042:2005). The lowering in hardness and tensile strength in the HAZ are believed to be a result from beta-phase (AlFeSi), lead to transformation and coarsening of the strengthening and metastable precipitate. The HAZ is wide, ranging about 20 mm from the fusion line in 5 mm thick plate. The microstructure evaluation has shown that the grain size in the HAZ has been influenced while welding. The EDS analysis shows that a small amount of AlFeSi particles occur in the base material and HAZ but not in the weld seam. Future research is suggested to focus on understanding more about ageing, coarsening of beta-phase and precipitation of intermetallic phases.

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25

Maddrell, Ewan Robert. "Diffusion bonding of aluminium alloys". Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317935.

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26

Parson, N. C. "Extrusion of aluminium-lithium alloys". Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37814.

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Kim, Yoomi. "Oxidation of niobium-aluminium alloys". Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624866.

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28

Quested, Thomas Edward. "Solidification of inoculated aluminium alloys". Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614829.

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29

Bunn, Alice Mary. "Grain refinement in aluminium alloys". Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/284033.

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30

Pereira, Diogo Jorge O. A. "Friction surfacing of aluminium alloys". Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8758.

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Dissertação para a obtenção do grau de Mestre em Engenharia Mecânica
Friction surfacing is a solid state joining process that has attracted much interest in the past decades. This technology allows joining dissimilar metallic materials while avoiding the brittle intermetallic formations, involving temperatures bellow melting point and producing like forged metal structures. Much research using different steels has been made but the same does not happen with aluminium alloys, specially using different aluminium alloys. Friction surface coatings using consumable rods of AA6082-T6 were produced on AA2024-T3 plates using a wide range of parameters. Coatings were examined to assure the best set of parameters according to the physical properties, such as: bonding width and thickness. Coatings were characterized metallurgical and mechanically. Besides metallurgical techniques, hardness, tensile, bending and wear tests were carried out. From this study, it was shown that high rotation speeds reduce the coating thickness and improve bonding to the substrate, while the applied load is the key parameter to obtain a good bonding width. Travel speed controls the deposition rate and the coating thickness. For the tested parameters a fine grain structure was obtained. The coatings have similar properties to the as-received rods but with higher ultimate tensile strength (UTS), elongation and wear resistance. Finally, an assessment of power and material consumption was performed revealing that Friction Surfacing is quite competitive when compared to other surface coating technologies.

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31

Hunt, Anthony W. "Fatigue of commercial aluminium alloys". Thesis, Aston University, 1986. http://publications.aston.ac.uk/11901/.

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Fatigue crack propagation has been observed for a number of commercial aluminium alloys. Comparable data was obtained for a variety of crack and specimen geometries over a range of crack lengths for a given alloy. Where crack propagation only was of interest the initiation event has been excluded by pre-cracking the specimen using a fin of material adjacent to the crack face. By this method a controlled defect size is introduced in to the specimen. By modification of the D.C. potential drop method it has been shown possible to measure the growth of cracking from 0.12mm by this method. Crack growth from defects greater than 0.6mm have been shown to give conventional crack propagation deduced by principle of similitude. Fatigue fracture surface analysis has been conducted for cracking from both free surfaces and from blunt notches. A `quasi cleavage' feature has been identified and is shown to be prominent when the fatigue stress intensity range is below 10 MNm-3/2.

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32

Chama, Shadreck. "Mechanically alloyed aluminium-magnesium-lithium alloys : structure property relations". Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399120.

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33

Shirandasht, Jamshid. "Évaluation de la technique LiMCA II pour la mesure d'inclusions dans l'aluminium pur et l'alliage binaire Al-6%Si : rôle de la température de coulée /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2005. http://theses.uqac.ca.

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34

Ergin, Guvenc. "Étude de la mouillabilité des particules granulaires par les alliages d'aluminium durant la filtration d'aluminium /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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Thèse (D.Eng.) -- Université du Québec à Chicoutimi, 2006.
La p. de t. porte en outre: Thèse présentée à l'Université du Québec à Chicoutimi pour l'obtention du doctorat en ingénierie. CaQCU Bibliogr.: f. 130-147. Document électronique également accessible en format PDF. CaQCU

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35

Gagnon, Dominique. "Effets des paramètres métallurgiques sur la microstructure, la macrostructure et la performance des alliages 319, 356 et 413 /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2005. http://theses.uqac.ca.

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36

Ganguly, Supriyo. "Non-destructive measurement of residual stresses in welded aluminium 2024 airframe alloy". Thesis, n.p, 2004. http://ethos.bl.uk/.

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37

Schaffer, Paul. "Grain refiner fade in aluminium alloys /". [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18566.pdf.

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38

Riestra, Martin. "High performing cast aluminium-silicon alloys". Licentiate thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Material och tillverkning, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-38005.

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The need to produce lighter components due to environmental aspects and the development of electrical vehicles represents an opportunity for cast aluminium-silicon alloys. With high specific strength, good castability, high corrosion resistance and recyclability, these alloys offer an attractive combination of properties as an alternative to steel, cast iron and titanium-based components in certain applications. To take advantage of such a combination of properties, there is a need to ensure that they can be reliably achieved. In other words, high performing components need to be produced. For that, the production cycle, from alloy selection and melt preparation, to the casting and heat treatment of the component must be understood and controlled as a whole. The different steps in the production cycle will affect the microstructure of the components and hence the resulting mechanical properties. Understanding the relation between the different steps in the production cycle, its consequences on the microstructural features and on the mechanical properties constitutes the aim of this thesis. Experiments applying state-of-the-art knowledge regarding effect of casting process, alloying system and post-process variables were performed aimed at achieving properties similar to those of high pressure die casting (HPDC) components. Different melt quality determination tools were evaluated on three different EN AC-46000 melt qualities. The influence of modification, grain refinement and both treatments together was assessed on an Al-10Si alloy solidified under different cooling rates. The tensile behaviour and the impact of features such as secondary dendrite arm spacing (SDAS) or grain sizes was quantified. It was corroborated that by appropriate selection and control of such alloying system, process and post-process variables it is possible to achieve HPDC EN AC-46000 tensile and fatigue properties through a T5 treated sand cast EN AC-42100 alloy. On the other hand, the available techniques for melt quality assessment are inadequate, requiring further analysis to successfully identify the melt quality. Additionally, it was observed that decreasing the melt quality by additions of 25 wt.% of machining chips did not significantly decrease the tensile properties but slightly increased the variation in them. In relation to the modification and grain refinement of Al-10Si alloys it was concluded that with the slowest cooling rate tested, additions of only grain refiner did not successfully produce equiaxed grains. For cooling rates corresponding to dendrite arm spacings of 15 μm and slower, combined additions of grain refiner and modifier can lead to higher tensile properties compared to the corresponding separate additions. SDAS was observed to describe flow stress through the Hall-Petch equation but grain size did not show a physically meaningful relationship. Furthermore, beginning of cracking was detected in the plastic deformation region at dendrite/eutectic boundaries and propagated in a trans-granular fashion.

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Hewitt, Paul. "Second phase dissolution in aluminium alloys". Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38032.

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Talbot, D. E. J. "Hydrogen in aluminium and its alloys". Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235894.

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Bransden, Antony Stuart. "Laser surface alloying of aluminium alloys". Thesis, Coventry University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241106.

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Han, Do-Suck. "Deformation of semi-solid aluminium alloys". Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325223.

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Pakes, Andrew. "Anodising aluminium alloys in borax electrolyte". Thesis, University of Manchester, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558167.

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Sotoudeh, Kasra. "Fundamentals of superplasticity in aluminium alloys". Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488771.

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Alshmri, Faraj D. F. "Rapidly solidified aluminium-high silicon alloys". Thesis, University of Leicester, 2010. http://hdl.handle.net/2381/9952.

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Aluminium silicon alloys are the most used raw material for automotive applications. One of the main limitations on using aluminium high silicon alloys is the formation of coarse brittle phases under conventional solidification conditions. However, rapid solidification processing (RS) is very effective in limiting the coarsening of primary silicon due to high cooling rate. Aluminium high silicon alloys can be processed by different RS methods. However, melt spinning is the most familiar of all RS commercial methods. Rapid solidification is a material production route. It does not give the final shape. Rapidly solidified materials require consolidation after solidification. Moreover, consolidation requires mechanical and/or thermal treatment. These treatments may degrade the microstructure. Also hot extrusion may be used as a final step, which may cause deterioration of the initially useful properties due to hot working. In general, although rapid solidification may suppress the coarsening of Si during solidification, the Si particulates may still coarsen during the subsequent thermo-mechanical treatment due to heat effect during consolidation and extrusion. In the present work characterisation of the material at various stages of production has been carried out and understanding of the metallurgical phenomena involved. Several alloy variants were examined. Coarsening behaviour of the Silicon particles and hardness tests were carried out. Wear properties of the alloys have been studied under dry sliding conditions against a steel ball bearing. Analyses and observation of the wear surfaces and wear mechanisms of these alloys are discussed. Wear of RS materials was compared with piston material A390 made by casting. Degassing and HIPping at 400 °C for 12 hrs prior to HIPping seems to be the optimum the degassing is effective whilst avoiding excessive coarsening of the silicon particles. Alloy number RSP461 (Al 21Si 3.9Cu 1.2Mg 2.4Fe 1.4Ni 0.4Zr) shows excellent wear resistance due to its fine microstructure.

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Okon, Panton. "Laser conduction welding of aluminium alloys". Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400234.

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Jirattiticharoean, Worawit. "Thixoforming of wrought 7xxx aluminium alloys". Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421145.

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Makin, P. L. "Recrystallization in aluminium-lithium based alloys". Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356656.

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Torrescano, Alvarez Jeanette. "Hard anodic films for aluminium alloys". Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/hard-anodic-films-for-aluminium-alloys(70029c32-b09f-452d-ba17-223facc3ee12).html.

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This work aims to investigate the effects of current density, electrolyte temperature and substrate composition on the morphology of porous anodic films formed on AA 2024-T3 alloy in sulphuric acid electrolytes and the factors that determine the transition between linear and sponge-like film porosities. Comparisons were made with pure aluminium. Particular attention is given to understanding the rising voltage that occurs during galvanostatic hard anodizing of the alloy and the role of oxygen in the anodizing process. Conditions were selected to be representative of typical hard and conventional anodizing processes. SEM was employed to observe the film morphology, which was then correlated with the voltage-time responses. The anodic film composition was investigated by TEM/EDX and SEM/EDX to determine the effect of alloy element enrichment and cell diameter on the distribution of copper species in the film. A real-time gravimetric method was developed to measure the rate of oxygen evolution during anodizing and its influence on the anodizing voltage and film morphology. Results showed that hard anodic films on AA 2024-T3 alloy formed at relatively high voltages have linear pores and cells, contrasting with sponge-like porosity under conventional anodizing. The linear porosity is shown to depend on the voltage, with a morphological transition occurring in the range 25 to 30 V, with linear cells promoted by a high current density and/or low electrolyte temperature. As the film thickens with time, pore blockage by oxygen bubbles, impedes oxidation of the alloy leading to current re-distribution and hence localized increases in the current density producing a rise of the anodizing voltage as anodizing proceeds. The rise of the anodizing voltage, which leads to an increasing call diameter and barrier layer thickness, has a minor influence on the rate of oxygen evolution, which typically consumes about 20 % of the applied current density. In contrast, the voltage rise in the presence of sponge-like films is comparatively negligible, which is suggested to be due to easier escape of oxygen from the film. The films comprising linear cells contain more copper than the sponge-like films, with copper being enriched at the cell boundaries. Moreover, a model is proposed to explain the enrichment of copper, suggesting that above a critical cell diameter, an alloy enrichment sufficient for oxidation of the alloying element can be maintained across the alloy/film interface. Below this diameter, the enrichment is less than that necessary for oxidation, and the alloying element is then incorporated into the film at the cell boundaries.

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Van, den Bos Christopher. "Electrochemical surface processing of aluminium alloys". Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621140.

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