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

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dc.contributor.advisorLang, Candaceen_ZA
dc.contributor.authorAllies, Sorayoen_ZA
dc.date.accessioned2014-12-25T15:53:44Z
dc.date.available2014-12-25T15:53:44Z
dc.date.issued2013en_ZA
dc.descriptionIncludes abstract.en_ZA
dc.description.abstractComputational 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.identifier.apacitationAllies, 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/11427/10006en_ZA
dc.identifier.chicagocitationAllies, 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/11427/10006en_ZA
dc.identifier.citationAllies, S. 2013. Investigation of a computationally predicted structure in the Ag-Pt system. University of Cape Town.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
dc.identifier.urihttp://hdl.handle.net/11427/10006
dc.identifier.vancouvercitationAllies 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/11427/10006en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherEngineeringen_ZA
dc.titleInvestigation of a computationally predicted structure in the Ag-Pt systemen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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