Abstract
Desirable physical properties not provided by single-phase materials are often conveniently attained by multiphase composites. This paper is concerned with the variation of the mechanical properties of bulk glass through the incorporation of a crystalline oxide phase. Glass-Al2O3 and glass-ZrO2 composites containing 20 and 40 vol % spherical, crystalline inclusions, 125 to 150 μrn in diameter, were prepared by hot pressing. The effects of internal stress and elastic properties of the crystalline inclusion on composite mechanical properties were studied. Experimental elastic-property values agreed well with theoretical values calculated from Hashin's equations. Flexural strength tests of all composite compositions revealed that the fracture path rarely traversed the crystalline oxide inclusions. The Al2O3 and ZrO2 additions strengthened the glass considerably, except when internal stresses were of sufficient magnitude to cause cracking of the glassy matrix upon cooling and before flexural testing. Glass-Al2O3 composites were consistently stronger than the glass-ZrO2 counterparts. This strength difference is attributed to the higher elastic moduli of the Al2O3 composites. Hypotheses which postulate strengthening as a result of restricted flaw size are apparently not applicable to these materials.
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This paper is based on part of a thesis submitted by W. J. Frey in partial fulfilment of the requirements for the degree of Master of Science in Materials, Rensselaer Polytechnic Institute, June 1966.
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Frey, W.J., Mackenzie, J.D. Mechanical properties of selected glasscrystal composites. J Mater Sci 2, 124–130 (1967). https://doi.org/10.1007/BF00549571
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DOI: https://doi.org/10.1007/BF00549571