1/2 Creep Fracture in Ceramic Polycrystals I. Creep Cavitation Effects in Polycrystalline Alumina

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Fine grained polycrystalline alumina has been deformed in creep at high temperatures, to examine the evolution of cavities at grain boundaries. Cavities with equilibrium and crack-like morphologies have been observed, distributed non-uniformly throughout the material. The role of cavities during creep has been described. A transition from equilibrium to crack-like morphology has been observed and correlated with a model based on the influence of the surface to boundary diffusivity ratio and the local tensile stress. The contribution of cavitation to the creep rate and total creep strain has been analyzed and excluded as the principal cause of the observed non-linear ... continued below

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31 p.

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Porter, J. R.; Blumenthal, W. & Evans, A. G. September 1980.

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Fine grained polycrystalline alumina has been deformed in creep at high temperatures, to examine the evolution of cavities at grain boundaries. Cavities with equilibrium and crack-like morphologies have been observed, distributed non-uniformly throughout the material. The role of cavities during creep has been described. A transition from equilibrium to crack-like morphology has been observed and correlated with a model based on the influence of the surface to boundary diffusivity ratio and the local tensile stress. The contribution of cavitation to the creep rate and total creep strain has been analyzed and excluded as the principal cause of the observed non-linear creep rate,

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31 p.

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  • Journal Name: Acta Metallurgica

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  • Report No.: LBL-11560
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1077140
  • Archival Resource Key: ark:/67531/metadc837524

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  • September 1980

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  • May 19, 2016, 9:45 a.m.

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  • June 23, 2017, 3:03 p.m.

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Porter, J. R.; Blumenthal, W. & Evans, A. G. 1/2 Creep Fracture in Ceramic Polycrystals I. Creep Cavitation Effects in Polycrystalline Alumina, article, September 1980; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc837524/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.