Investigation of a computationally predicted structure in the Ag-Pt system

 

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dc.contributor.advisor Lang, Candace en_ZA
dc.contributor.author Allies, Sorayo en_ZA
dc.date.accessioned 2014-12-25T15:53:44Z
dc.date.available 2014-12-25T15:53:44Z
dc.date.issued 2013 en_ZA
dc.identifier.citation Allies, S. 2013. Investigation of a computationally predicted structure in the Ag-Pt system. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/10006
dc.description Includes abstract. en_ZA
dc.description.abstract Computational modelling is fast becoming the chosen way to predict novel structures. These structures need to be validated in order to gain credibility and generate more confidence in computational predictions. This investigation of the equiatomic region of the Ag-Pt system shows that computational modelling can be used successfully as a precursor to experimental investigations. Various techniques including electron microscopy, hardness and Differential Scanning Calorimetry were used to investigate different properties of the alloy. These techniques have shown that an ordered phase may exist in the Ag-Pt system. This ordered phase has been shown to have an increased hardness and has produced extra reflections in electron diffraction patterns. Scanning Electron Microscope equipped with a Backscattered Electron detector has shown that a third phase is present in the alloy and the composition is close to 50:50; within experimental error. The alloys showed considerable inhomogeneity and it was not homogenised prior to or post cold rolling. This could be a reason for the third phase not reaching an equilibrium state after prolonged heat treatments. The final structure might be the L11 structure but the full transformation is slow and further investigation is required. It is recommended that future research be carried out taking into account the recommendations provided in Chapter 7. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Engineering en_ZA
dc.title Investigation of a computationally predicted structure in the Ag-Pt system en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Department of Mechanical Engineering en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Allies, S. (2013). <i>Investigation of a computationally predicted structure in the Ag-Pt system</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/10006 en_ZA
dc.identifier.chicagocitation Allies, Sorayo. <i>"Investigation of a computationally predicted structure in the Ag-Pt system."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2013. http://hdl.handle.net/11427/10006 en_ZA
dc.identifier.vancouvercitation Allies S. Investigation of a computationally predicted structure in the Ag-Pt system. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2013 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/10006 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Allies, Sorayo AB - Computational modelling is fast becoming the chosen way to predict novel structures. These structures need to be validated in order to gain credibility and generate more confidence in computational predictions. This investigation of the equiatomic region of the Ag-Pt system shows that computational modelling can be used successfully as a precursor to experimental investigations. Various techniques including electron microscopy, hardness and Differential Scanning Calorimetry were used to investigate different properties of the alloy. These techniques have shown that an ordered phase may exist in the Ag-Pt system. This ordered phase has been shown to have an increased hardness and has produced extra reflections in electron diffraction patterns. Scanning Electron Microscope equipped with a Backscattered Electron detector has shown that a third phase is present in the alloy and the composition is close to 50:50; within experimental error. The alloys showed considerable inhomogeneity and it was not homogenised prior to or post cold rolling. This could be a reason for the third phase not reaching an equilibrium state after prolonged heat treatments. The final structure might be the L11 structure but the full transformation is slow and further investigation is required. It is recommended that future research be carried out taking into account the recommendations provided in Chapter 7. DA - 2013 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 T1 - Investigation of a computationally predicted structure in the Ag-Pt system TI - Investigation of a computationally predicted structure in the Ag-Pt system UR - http://hdl.handle.net/11427/10006 ER - en_ZA


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