Elastic/Plastic Behavior of Chalcogenide Glasses in the Ge-Sb-Se System
dc.contributor.author | Rangarajan, Badri | |
dc.date.accessioned | 2011-11-18T19:53:17Z | |
dc.date.available | 2011-11-18T19:53:17Z | |
dc.date.issued | 2004 | |
dc.description.abstract | Elastic/plastic behavior of chalcogenide glasses in the Ge-Se and Ge-Sb-Se systems was studied using different spherical indenters: 400μm and 2mm. Static room temperature indentations were carried out to determine the trends in hardness, fracture toughness and brittleness with respect to the average covalent coordination number, <r>. Binary glasses show maximization in fracture toughness and minimization in brittleness at the composition Ge_{20}Se_{80}. No such trends were observed for ternary glasses. Indentations were also performed at -80°C to ensure that the trends are due to structural considerations of optimized connectivity. LBH and elastic modulus increase linearly with the network connectivity. Elastically recovered energy increases with indenter diameter showing a local maximum at Ge_{20}Se_{80}. Finite element simulations of binary glasses also show similar trends for LBH and DBH. Increasing elastic moduli cause stresses to increase with <r> for a given indenter ball diameter. Computed yield stresses, when plotted against <r>, show small deviations from apparent linearity at <r> = 2.4, giving another hand to the theory of rigidity percolation. | en_US |
dc.identifier.uri | http://hdl.handle.net/10829/424 | |
dc.language.iso | en-US | en_US |
dc.publisher | Alfred University. Faculty of Ceramic Engineering. Kazuo Inamori School of Engineering | en_US |
dc.subject | Plasticity | en_US |
dc.subject | Chalcogenide glasses | en_US |
dc.subject | Selenium | en_US |
dc.subject | Germanium | en_US |
dc.subject | Elasticity | en_US |
dc.subject | Antimony | en_US |
dc.title | Elastic/Plastic Behavior of Chalcogenide Glasses in the Ge-Sb-Se System | en_US |
dc.type | Thesis | en_US |
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