HIGH TEMPERATURE STRESS-STRAIN BEHAVIOR OF MgO IN COMPRESSION

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Compressive stress-strain curves for several types of polycrystalline MgO specimens were correlated with those for single crystals and analyzed as a function of grain size and grain-boundary character at 1200 and 1400 C for several strain rates. The results for fully dense specimens were explained in terms of grain-boundary sliding and intergranular separation in addition to slip. The modification of grain-boundary nature concurrent with heat treatment for grain growth, caused by residual LUF, was associated with enhanced grain-boundary sliding and intergranular separation. For grain sizes <30 {micro}m, it was concluded that the von Miss criteria for ductility could be relaxed ... continued below

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38 p.

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Dokko, P.C & Pask, J.A. January 1, 1979.

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Compressive stress-strain curves for several types of polycrystalline MgO specimens were correlated with those for single crystals and analyzed as a function of grain size and grain-boundary character at 1200 and 1400 C for several strain rates. The results for fully dense specimens were explained in terms of grain-boundary sliding and intergranular separation in addition to slip. The modification of grain-boundary nature concurrent with heat treatment for grain growth, caused by residual LUF, was associated with enhanced grain-boundary sliding and intergranular separation. For grain sizes <30 {micro}m, it was concluded that the von Miss criteria for ductility could be relaxed by the Occurrence of dislocation climb and, to a limited extent, by intergranular separation. Yield drop corresponding to dislocation multiplication occurred when grain-boundary sliding was initially promoted. Specimens with a liquid phase of adequate viscosity also indicated plasticity accompanied by high strength. Specimens with clean grain boundaries exhibited ductility and normal strain hardening with no intergranular separation.

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38 p.

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  • Journal Name: American Ceramic Society; Journal Volume: 62; Journal Issue: 9-10

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  • Report No.: LBL-6993-Rev.
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1111/j.1151-2916.1979.tb19099.x | External Link
  • Office of Scientific & Technical Information Report Number: 1004887
  • Archival Resource Key: ark:/67531/metadc829456

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  • January 1, 1979

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  • May 19, 2016, 3:16 p.m.

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  • July 26, 2016, 5:43 p.m.

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Dokko, P.C & Pask, J.A. HIGH TEMPERATURE STRESS-STRAIN BEHAVIOR OF MgO IN COMPRESSION, article, January 1, 1979; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc829456/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.