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- W2072003703 abstract "It has been shown with single crystals, bicrystals, and polycrystalline material that the strength of magnesium oxide depends on the availability of mobile dislocation sources. Mobile dislocations, introduced by mechanical contact at the surface, are responsible for the ductility normally observed in single crystals. When mobile dislocations are removed by a chemical polish, single crystals become extremely strong (>160,000 psi) and elastic. In the absence of mobile dislocations bicrystals are also extremely strong and elastic but in their presence bicrystals are relatively weak (10,000 psi) and brittle. The brittleness is due to the direct interaction of slip bands with grain boundaries to generate cracks. The strength of high-density polycrystalline magnesia is similarly sensitive to the presence of mobile dislocations. When care is taken to eliminate surface defects and to immobilize dislocations, tensile strengths of 30,000 psi can be attained, but when mobile dislocations are present the strength drops to 15,000 to 20,000 psi. Mobile dislocations can be introduced directly by mechanical contact or indirectly through the presence of pores." @default.
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- W2072003703 date "1963-09-01" @default.
- W2072003703 modified "2023-09-27" @default.
- W2072003703 title "Dislocations and the Tensile Strength of Magnesium Oxide" @default.
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- W2072003703 doi "https://doi.org/10.1111/j.1151-2916.1963.tb11769.x" @default.
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