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dc.contributor.supervisorDeng, Chuang (Mechanical Engineering)en_US
dc.contributor.authorAlishahi, Ehsan
dc.date.accessioned2018-09-13T13:58:28Z
dc.date.available2018-09-13T13:58:28Z
dc.date.issued2018-08en_US
dc.date.submitted2018-08-28T17:43:36Zen
dc.date.submitted2018-09-13T03:17:04Zen
dc.identifier.citation1. E. Alishahi, C. Deng, “Orientation Dependent Plasticity of Metallic Amorphous-Crystalline Interface”, Computational Materials Science 141 375–387, 2018.en_US
dc.identifier.citation2. E. Alishahi, C. Deng, “Fast Phase Mapping of Mechanically Alloyed Cu-Zr by using Nanoindentation”, Accepted manuscript, Materialia, 2018.en_US
dc.identifier.urihttp://hdl.handle.net/1993/33345
dc.description.abstractCommercial applications of bulk amorphous metallic glasses are restricted due to a sudden brittle failure mode. To overcome this limitation, a toughening strategy in metallic glasses based on the introduction of large quantities of crystalline – amorphous (C-A) interfaces has been widely proposed, e.g., to form various types of C-A composites. Accumulative roll boding (ARB) technique as a cost-effective synthesis method that can be potentially used for producing bulk sized C-A composites, has thus received significant attention in recent years. However, previous studies on expensive highly pure Cu-Zr multilayers did not show neither significant amorphization nor alloying during the ARB process. This research aims to modify the ARB technique for the synthesis of cost-effective bulk C-A composites based on commercially available Cu-Zr sheets. The proposed ARB guideline provides conditions which ensure mechanical alloying and amorphization of CuZr phases in a commercial Cu-Zr alloy system. The composition and structural analysis revealed that intermediate annealing facilitates the formation of several amorphous and crystalline CuZr phases during the ARB process. Additionally, mechanical tests based on nanoindentation indicated that the CuZr phases, whether they are crystalline or amorphous, show a higher hardness and elastic modulus than pure Cu and Zr phases. Numerical molecular dynamics technique was also employed to study the fundamental structure-property relation at the C-A interface. Based on the results, the interfacial energy demonstrated a weak dependence on the crystalline orientation. In contrast, the plasticity of C-A composites was mainly determined by crystalline orientation at the C-A interface.en_US
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectARB, Crystalline – amorphous interface, Nanoindentation, Structure-property relation, Molecular dynamicsen_US
dc.titleSynthesis and characterization of metallic crystalline - amorphous Cu-Zr compositesen_US
dc.typedoctoral thesisen_US
dc.degree.disciplineMechanical Engineeringen_US
dc.contributor.examiningcommitteeWu, Nan (Mechanical Engineering) Oliver, Derek (Electrical and Computer Engineering) Zhang, Hao (Chemical and Materials Engineering, University of Alberta)en_US
dc.degree.levelDoctor of Philosophy (Ph.D.)en_US
dc.description.noteOctober 2018en_US


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