Abstract
Magnesium aluminate spinel may be hot pressed to essentially theoretical density, and with a wide range of grain sizes. High-temperature deformation behavior may be deduced from two temperature-dependent properties, yield stress and viscosity, applicable to Bingham solids. These terms have been calculated from the densification data and are compared with similar data for beryllia and alumina. Strength and deformation at fracture of transversely loaded small beams cut, ground, and lapped from hot-pressed spinel blanks have been determined at room temperature, and are reported as functions of surface finish, state of oxidation, and microstructure. The effect of a second-phase graphite addition, from 0.001 to 10 wt.%, on micro-structure and deformation of spinel is described and related to the problem of anion stoichiometry in oxide ceramics. Polycrystalline spinel, when cyclically strained at room temperature, shows some small evidence of permanent deformation before failure. Fractography of cyclically failed specimens reveals occasional plastically deformed grains—demonstrating slip or twinning on (111) planes—among the predominantly brittle fracture markings.
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Palmour, H., Choi, D.M., Barnes, L.D., McBrayer, R.D., Kriegel, W.W. (1963). Deformation in Hot-Pressed Polycrystalline Spinel. In: Stadelmaier, H.H., Austin, W.W. (eds) Materials Science Research. Materials Science Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-5537-1_10
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DOI: https://doi.org/10.1007/978-1-4899-5537-1_10
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