Trosolwg
Microstrwythur ac Esblygiad Gwead
Mecanweithiau Anffurfiad
Prosesu Thermofecanyddol
Trawsnewid Cyfnod
Eiddo Strwythur/Nodwedd
Metelau Ysgafn (Ti ac Mg)
Deunyddiau Niwclear (GEN-III a GEN-IV)
EBSD
Modelu Elfen Gyfyngedig Plastigrwydd Crisial
Dr Leo Prakash
Senior Lecturer
Materials Science and Engineering
Swyddfa Academaidd - A209
Ail lawr
Adeilad Dwyreinol Peirianneg
Campws y Bae
Ail lawr
Adeilad Dwyreinol Peirianneg
Campws y Bae
Ar gael ar gyfer Goruchwyliaeth Ôl-raddedig
Dolenni Ymchwil
Cyhoeddiadau
Uchafbwyntiau Ymchwil
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Savarimuthu, S., Prakash, D., Thomas, S., Gandhi, T., & Prakash, L. (2018). DBU‐Mediated Intermolecular 5‐exo‐dig Cyclization of PropargylAlcohols and Carbon Disulfide to [1,3]‐Oxathiole‐2‐thiones. ChemistrySelect, 3(46), 13087-13090.
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Savarimuthu, S., Thankappan, H., Thomas, S., Prakash, D., & Prakash, L. (2018). Sodium Tertiary Pentoxide: A Mild and Efficient Base to Make C-C Bond between Acetylenes and Aldehydes (or) Ketones Producing Propargyl Alcohols. ChemistrySelect, 3(29), 8479-8482.
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Savarimuthu, S., Thomas, S., Prakash, D., Gandhi, T., & Prakash, L. (2016). LiOtBu Promoted 5-Exo-dig Cyclization of Propargyl Alcohols and Isocyanates for the Synthesis of Multisubstituted 3H-Oxazol-2-ones and Oxazolidin-2-ones. ChemistrySelect, 1(9), 2035-2039.
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Krishna, K., Prakash, L., Timár, G., Fitzner, A., Srivastava, D., Saibaba, N., Fonseca, J., Dey, G., & Preuss, M. (2016). The effect of loading direction and Sn alloying on the deformation modes of Zr: An in-situ neutron diffraction study. Materials Science and Engineering: A, 650, 497-509.
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Fitzner, A., Prakash, L., Fonseca, J., Thomas, M., Zhang, S., Kelleher, J., Manuel, P., & Preuss, M. (2016). The effect of aluminium on twinning in binary alpha-titanium. Acta Materialia, 103, 341-351.
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Prakash, L., Preuss, M., Dahlbäck, M., & Fonseca, J. (2015). Microstructure and texture evolution during thermomechanical processing of β-quenched Zr. Acta Materialia, 88, 389-401.
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Mani Krishna, K., Leo Prakash, D., Srivastava, D., Saibaba, N., Quinta da Fonseca, J., Dey, G., Preuss, M., & Prakash, L. (2015). Influence of Sn on Deformation Mechanisms During Room Temperature Compression of Binary Zr–Sn Alloys. Zirconium in the Nuclear Industry: 17th Volume, 138-158.
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Antony Savarimuthu, S., Leo Prakash, D., Augustine Thomas, S., & Prakash, L. (2014). Nucleophilic substitution of propargyl alcohols with aliphatic alcohols, aliphatic amines and heterocycles catalyzed by 4-nitrobenzenesulfonic acid: A scalable and metal-free process. Tetrahedron Letters
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Fitzner, A., Leo Prakash, D., Quinta da Fonseca, J., Preuss, M., Thomas, M., Zhang, S., Kelleher, J., & Prakash, L. (2013). The Effect of Aluminium on Deformation and Twinning in Alpha Titanium: The 45° Case. Materials Science Forum, 765, 549-553.
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Leo Prakash, D., Honniball, P., Rugg, D., Withers, P., Quinta da Fonseca, J., Preuss, M., & Prakash, L. (2013). The effect of β phase on microstructure and texture evolution during thermomechanical processing of α+β Ti alloy. Acta Materialia, 61(9), 3200-3213.
Holl Ymchwil
Erthyglau Cylchgronau
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Savarimuthu, S., Prakash, L., Thomas, S., Gandhi, T., & Bera, M. (2020). Highly Z-selective synthesis of 1,3-oxathiol-2-ylidenes and 4-methylene-oxazolidine-2-thiones via atom-specific 5-exo-dig cyclization of propargyl alcohol with isothiocyanate. Organic & Biomolecular Chemistry, 18(18), 3552-3562.
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Simm, T., Das, Y., Forsey, A., Gungor, S., Fitzpatrick, M., Prakash, L., Moat, R., Birosca, S., Fonseca, J., & Perkins, K. (2020). The τ-plot, a multicomponent 1-D pole figure plot, to quantify the heterogeneity of plastic deformation. Materials Characterization, 160, 110114
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Savarimuthu, S., Prakash, D., Thomas, S., Gandhi, T., & Prakash, L. (2018). DBU‐Mediated Intermolecular 5‐exo‐dig Cyclization of PropargylAlcohols and Carbon Disulfide to [1,3]‐Oxathiole‐2‐thiones. ChemistrySelect, 3(46), 13087-13090.
-
Savarimuthu, S., Thankappan, H., Thomas, S., Prakash, D., & Prakash, L. (2018). Sodium Tertiary Pentoxide: A Mild and Efficient Base to Make C-C Bond between Acetylenes and Aldehydes (or) Ketones Producing Propargyl Alcohols. ChemistrySelect, 3(29), 8479-8482.
-
Savarimuthu, S., Thomas, S., Prakash, D., Gandhi, T., & Prakash, L. (2016). LiOtBu Promoted 5-Exo-dig Cyclization of Propargyl Alcohols and Isocyanates for the Synthesis of Multisubstituted 3H-Oxazol-2-ones and Oxazolidin-2-ones. ChemistrySelect, 1(9), 2035-2039.
-
Fitzner, A., Prakash, L., Fonseca, J., Thomas, M., Zhang, S., Kelleher, J., Manuel, P., & Preuss, M. (2016). The effect of aluminium on twinning in binary alpha-titanium. Acta Materialia, 103, 341-351.
-
Krishna, K., Prakash, L., Timár, G., Fitzner, A., Srivastava, D., Saibaba, N., Fonseca, J., Dey, G., & Preuss, M. (2016). The effect of loading direction and Sn alloying on the deformation modes of Zr: An in-situ neutron diffraction study. Materials Science and Engineering: A, 650, 497-509.
-
Prakash, L., Preuss, M., Dahlbäck, M., & Fonseca, J. (2015). Microstructure and texture evolution during thermomechanical processing of β-quenched Zr. Acta Materialia, 88, 389-401.
-
Mani Krishna, K., Leo Prakash, D., Srivastava, D., Saibaba, N., Quinta da Fonseca, J., Dey, G., Preuss, M., & Prakash, L. (2015). Influence of Sn on Deformation Mechanisms During Room Temperature Compression of Binary Zr–Sn Alloys. Zirconium in the Nuclear Industry: 17th Volume, 138-158.
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Antony Savarimuthu, S., Leo Prakash, D., Augustine Thomas, S., & Prakash, L. (2014). Nucleophilic substitution of propargyl alcohols with aliphatic alcohols, aliphatic amines and heterocycles catalyzed by 4-nitrobenzenesulfonic acid: A scalable and metal-free process. Tetrahedron Letters
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Fitzner, A., Leo Prakash, D., Quinta da Fonseca, J., Preuss, M., Thomas, M., Zhang, S., Kelleher, J., & Prakash, L. (2013). The Effect of Aluminium on Deformation and Twinning in Alpha Titanium: The 45° Case. Materials Science Forum, 765, 549-553.
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Leo Prakash, D., Honniball, P., Rugg, D., Withers, P., Quinta da Fonseca, J., Preuss, M., & Prakash, L. (2013). The effect of β phase on microstructure and texture evolution during thermomechanical processing of α+β Ti alloy. Acta Materialia, 61(9), 3200-3213.
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Obasi, G., Birosca, S., Prakash, D., Fonseca, J., Preuss, M., Birosca, S., & Prakash, L. (2012). The influence of rolling temperature on texture evolution and variant selection during α→β→α phase transformation in Ti–6Al–4V. Acta Materialia, 60(17), 6013-6024.
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Obasi, G., Moat, R., Leo Prakash, D., Kockelmann, W., Quinta da Fonseca, J., Preuss, M., & Prakash, L. (2012). In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V. Acta Materialia, 60(20), 7169-7182.
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Obasi, G., Moat, R., Leo Prakash, D., Kockelmann, W., Quinta da Fonseca, J., Preuss, M., & Prakash, L. (2011). In-Situ Observation on the Influence of ß Grain Growth on Texture Evolution during Phase Transformation in Ti-6A-4V. Materials Science Forum, 702-703, 854-857.
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Vorster, W., Van Der Watt, M., Venter, A., Oliver, E., Leo Prakash, D., Korsunsky, A., & Prakash, L. (2011). Influence of Quenchant Hydrodynamics and Boiling Phase Incipient Temperature Shifts on Residual Stress Formation. Heat Transfer Engineering, 30(7), 564-573.
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Leo Prakash, D., Ding, R., Moat, R., Jones, I., Withers, P., Fonseca, J., Preuss, M., & Prakash, L. (2010). Deformation twinning in Ti-6Al-4V during low strain rate deformation to moderate strains at room temperature. Materials Science and Engineering: A, 527(21-22), 5734-5744.
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Preuss, M., Quinta da Fonseca, J., Allen, V., Leo Prakash, D., Daymond, M., & Prakash, L. (2010). Twinning in structural material with a hexagonal close-packed crystal structure. The Journal of Strain Analysis for Engineering Design, 45(5), 377-390.
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Leo Prakash, D., Walsh, M., Maclachlan, D., Korsunsky, A., & Prakash, L. (2009). Crack growth micro-mechanisms in the IN718 alloy under the combined influence of fatigue, creep and oxidation. International Journal of Fatigue, 31(11-12), 1966-1977.
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Leo Prakash, D., Regener, D., Vorster, W., & Prakash, L. (2009). Effect of position on the tensile properties in high-pressure die cast Mg alloy. Journal of Alloys and Compounds, 470(1-2), 111-116.
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Leo Prakash, D., Regener, D., & Prakash, L. (2009). Effect of long term annealing on the microstructure and tensile properties of hpdc AZ91 Mg alloy. Journal of Alloys and Compounds, 467(1-2), 271-277.
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Leo Prakash, D., Regener, D., Vorster, W., & Prakash, L. (2008). Effect of long term annealing on the microstructure of hpdc AZ91 Mg alloy: A quantitative analysis by image processing. Computational Materials Science, 43(4), 759-766.
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Leo Prakash, D., Regener, D., & Prakash, L. (2008). Micro–macro interactions and effect of section thickness of hpdc AZ91 Mg alloy. Journal of Alloys and Compounds, 464(1-2), 133-137.
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Leo Prakash, D., Regener, D., Vorster, ., & Prakash, L. (2008). Microscopic failure modes of hpdc AZ91HP magnesium alloy under monotonic loading. Materials Science and Engineering: A, 488(1-2), 303-310.
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Leo Prakash, D., Regener, D., & Prakash, L. (2008). Quantitative characterization of Mg17Al12 phase and grain size in HPDC AZ91 magnesium alloy. Journal of Alloys and Compounds, 461(1-2), 139-146.
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Leo Prakash, D., Vorster, W., Zhang, S., Korsunsky, A., & Prakash, L. (2008). A Study of Residual Elastic Strain Distribution in an AZ91 Mg Alloy Bar Loaded in Four Point Bending. Materials Science Forum, 571-572, 113-118.
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Korsunsky, A., Song, X., Belnoue, J., Leo Prakash, D., Dini, ., Walsh, M., & Prakash, L. (2007). Modeling Crack Initiation and Propagation in Nickel Base Superalloys. Key Engineering Materials, 348-349, 53-56.
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Leo Prakash, D., Regener, D., & Prakash, L. (2006). Quantitative Characterization of Pore Arrangement in Pore Bands in Pressure Die Cast AZ91 Magnesium Alloy by Image Processing. Materials Science Forum, 514-516, 1477-1482.
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Leo Prakash, D., Regener, D., & Prakash, L. (2005). 2D Quantitative Characterization of Microstructural Inhomogeneities in the Pressure Die Cast AZ91 Magnesium Alloy. Practical Metallography, 42(11), 555-575.
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Leo Prakash, D., Prasanna, B., Regener, D., & Prakash, L. (2005). Computational microstructure analyzing technique for quantitative characterization of shrinkage and gas pores in pressure die cast AZ91 magnesium alloys. Computational Materials Science, 32(3-4), 480-488.
Penodau Llyfrau
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Prakash, L. (2008). Microstructural Influences on Tensile Properties of hpdc AZ91 Mg Alloy. Micro-Macro-interaction In Structured media and Particle Systems (pp. 19-31). Springer
Goruchwyliaeth
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Effect of Shear Strain on Metal Deformation and Microstructural Evolution (dyfarnwyd 2023)
PhDGoruchwyliwr arall: Dr Amit Das
Modiwlau a Addysgir
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EG-1007 Engineering Analysis for Materials
To provide a grounding in engineering analysis methods for materials students. The module will cover the most important analytical functions and methods used in engineering and will relate these to common materials-related examples. The module will ensure the required grounding in methods and techniques for those who have not previously covered this area, or who are returning after a gap. It will also provide opportunities for extension to more complicated examples for those who have more prior experience. It will also provide an introduction to thermal, electrical and optical science.
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EG-2036 Materials Structure and Characterisation Techniques
Introduction to order in materials-single crystals and polycrystalline powders. Understanding of the basic principles of crystallography and the factors governing atomic arrangements through defined examples of crystal structures of elements, ionic compounds, interstitial and substitutional solid solutions. The importance of powder diffraction for the characterisation of materials and examples of its application. Introduction to imperfections in crystals and the concept of disorder rather than defects (i.e. positive and negative effects of disorder). Disorder will be considered around 0-dimensional point defects (impurities and vacancies), 1-dimensional line defects (dislocations), 2-dimensional planar defects (interfaces and grain boundaries) and 3-dimensional defects (particulate) . The positive and negative effects of defects on different types of crystalline materials; and how understanding can lead to control. Case studies of real-life examples of disorder will be used to illustrate the concepts through the module. Furthermore, this module provides an in-depth coverage of quantitative metallographic techniques, and how they can be applied to characterise the microstructures in advanced metallic materials. The key elements of interest are planes and directions of hexagonal systems, crystallographic texture, characterization with X-rays and electrons, SEM/EBSD and compositional analysis. Cyflwyniad i drefn mewn deunyddiau - crisialau sengl a phowdrau polygrisialog. Dealltwriaeth o egwyddorion sylfaenol crisialograffeg a'r ffactorau sy'n llywodraethu trefniadau atomig trwy enghreifftiau diffiniedig o strwythurau crisial elfennau, cyfansoddion ïonig, toddiannau solid rhyngrstitial ac amnewidiol. Pwysigrwydd diffractiad powdr ar gyfer nodweddu deunyddiau ac enghreifftiau o'i gymhwysiad. Cyflwyniad i amherffeithrwydd mewn crisialau a'r cysyniad o anhrefn yn hytrach na diffygion (h.y. effeithiau cadarnhaol a negyddol anhrefn). Ystyrir anhrefn o amgylch diffygion pwynt 0-dimensiwn (amhureddau a gwagleoedd), diffygion llinell 1-dimensiwn (dadleoliadau), diffygion planar 2-dimensiwn (rhyngwynebau a ffiniau grawn) a diffygion 3-dimensiwn (gronynnol). Effeithiau cadarnhaol a negyddol diffygion ar wahanol fathau o ddeunyddiau crisialog; a sut y gall dealltwriaeth arwain at reolaeth. Defnyddir astudiaethau achos o enghreifftiau bywyd go iawn o anhrefn i ddangos y cysyniadau trwy'r modiwl. Ar ben hynny, mae'r modiwl hwn yn darparu sylw manwl i dechnegau metelograffig meintiol, a sut y gellir eu cymhwyso i nodweddu'r microstrwythurau mewn deunyddiau metelaidd uwch. Yr elfennau allweddol o ddiddordeb yw awyrennau a chyfeiriadau systemau hecsagonol, gwead crisialograffig, nodweddu gyda phelydrau-X ac electronau, SEM/EBSD a dadansoddiad cyfansoddiadol.
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EG-2037 Mechanical Deformation in Structural Materials: Theory and practicals
This module explores the deformation behaviour of a wide range of engineering materials, extending first-year principles to high-performance systems such as titanium and nickel alloys. Students will develop an understanding of deformation and damage mechanisms through focused study of elasticity, plasticity, alloy strengthening, fatigue, creep, and the mechanics of materials. The module also covers methods of mechanical testing and emerging technologies such as additive layer manufacturing. A key emphasis is placed on linking microstructure to mechanical properties across metals, ceramics, and composites, highlighting how processing treatments can significantly influence material behaviour. Through the identification and assessment of microstructures in both ferrous and non-ferrous alloys, students gain insight into how microstructural design and control underpin performance in advanced engineering applications. The module is delivered through a combination of lectures and practical classes, providing both theoretical understanding and hands-on experience in materials characterisation and analysis.
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EG-262 Stress Analysis 1
This module continues on from EG-120 or EG-131 and includes: section properties; unsymmetrical bending; stresses in thick cylinders; rotating discs; theories of failure; stress concentration effects; fatigue and linear elastic fracture mechanics.