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http://hdl.handle.net/11375/7994
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DC Field | Value | Language |
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dc.contributor.advisor | Nicholson, P.S. | en_US |
dc.contributor.author | Krstic, Vladimir D. | en_US |
dc.date.accessioned | 2014-06-18T16:41:28Z | - |
dc.date.available | 2014-06-18T16:41:28Z | - |
dc.date.created | 2010-08-26 | en_US |
dc.date.issued | 1979-03 | en_US |
dc.identifier.other | opendissertations/3233 | en_US |
dc.identifier.other | 4249 | en_US |
dc.identifier.other | 1477962 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/7994 | - |
dc.description.abstract | <p>The role of elastic, thermal and interfacial properties in the toughening of brittle particulate composites was studied. Three different systems were designed for these studies: 1) glass - partly oxidized Ni, where the thermal expansion coefficient of the glass is lower, equal to and higher than that of Ni; 2) glass - partly oxidized Al, in which both thermal expansion coefficients and elastic moduli are equal; and 3) the LiF-MgF₂ system, where the thermal expansion coefficient of LiF is 3.4 x that of MgF₂, and the elastic moduli of the two phases is similar. The first two systems were fabricated by mixing and hot-pressing the powders. In the LiF-MgF₂ system, second-phase particles were produced via a precipitation reaction.</p> <p>It was found that when the thermal expansion coefficient and elastic modulus of the second phase particles are higher than that of the glass matrix, a crack has a tendency to bypass the particles, propagating consistently in the matrix material. When the thermal and elastic stresses are eliminated and satisfactory bonding is achieved, a toughness increase up to 60 x that of the matrix results.</p> <p>In the LiF-MgF₂ composite, a 15 - 20 x toughness increase was achieved and is attributed to the precipitation of incoherent rod-shaped MgF₂ precipitates.</p> | en_US |
dc.subject | Metallurgy | en_US |
dc.subject | Metallurgy | en_US |
dc.title | The Effect of Internal Stresses and Interfacial Properties on Toughening of Brittle Matrices | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Metallurgy | 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 | 5.32 MB | Adobe PDF | View/Open |
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