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DC Field | Value | Language |
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dc.contributor.advisor | Purdy, G.R. | en_US |
dc.contributor.author | Perovic, Vuko | en_US |
dc.date.accessioned | 2014-06-18T16:41:36Z | - |
dc.date.available | 2014-06-18T16:41:36Z | - |
dc.date.created | 2010-09-01 | en_US |
dc.date.issued | 1980-06 | en_US |
dc.identifier.other | opendissertations/3260 | en_US |
dc.identifier.other | 4276 | en_US |
dc.identifier.other | 1528359 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/8022 | - |
dc.description.abstract | <p>The influence of the elastic interaction energy of plate-shaped precipitates causing tetragonal distortion on nucleation, growth and coarsening is considered.</p> <p>The analysis shows that the elastic interaction energy may be minimized by the formation of regular three-dimensional arrays, which emphasize the "edge-face" configuration. Algebraic conditions of stability against coarsening are developed, and the results of the detailed numerical test of stability against coarsening for a particularly simple and symmetric array are reported. Experimental observations on θ" (Al-3%Cu alloy) microstructures show strong evidence of short-range ordering, with two characteristic configurations (edge-face and "parallel-step"), both energetically favourable.</p> <p>It is shown that the elastic interaction energy may have a decisive role in the nucleation stage of θ' preoipitates. The θ' microstructure, in a relatively early stage of development, is often inhomogeneous and consists mainly of linear (parallel inclined and cross-like) stacks.</p> <p>Numerical calculations of the elastic interaction energy show that the experimentally observed stacks are energetically favourable, and can be generated in an auto-catalytic way. Numerical and preliminary experimental results on the stability against growth and coarsening of elastically-locked linear arrays are reported.</p> <p>Finally, the chemical driving force and elastic retarding force acting on moving ledges on a planar interphase boundary are considered. It is shown that elastic interaction may cause a departure from the local equilibrium at a moving growth ledge, and may dictate the location of "homogeneous" nucleation of growth ledges. Some experimental results concerning ledge nucleation and ledge interaction are reported.</p> | en_US |
dc.subject | Materials Science and Engineering | en_US |
dc.subject | Metallurgy | en_US |
dc.subject | Materials Science and Engineering | en_US |
dc.title | On the elastic interaction of plate-shaped precipitates | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Metallurgy and Materials Science | en_US |
dc.description.degree | Doctor of Philosophy (PhD) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
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File | Size | Format | |
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fulltext.pdf | 7.46 MB | Adobe PDF | View/Open |
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