Abstract
The microstructural development in fully and partially stabilized MgO-ZrO2 alloys during sub-eutectoid heat treatment at 1100° C, has been studied by optical and electron microscopy and powder X-ray diffraction in order to correlate the observed microstructures with the mechanical properties. The materials used were 14 mol % MgO-ZrO2 (Mg-CSZ) of eutectoid composition and 9 mol % MgO-ZrO2 (Mg-PSZ). In Mg-CSZ the decomposition reaction proceeds almost to completion before the maximum thermal up-shock properties are attained. For the Mg-PSZ material the most significant event leading to the enhanced mechanical properties appears to be the nucleation and growth of a long-range ordered anion vacancy phase within the cubic zirconia matrix. This, in turn, leads to the destabilization of the tetragonal ZrO2 precipitates also present in Mg-PSZ, causing some of them to acquire monoclinic intergrowths whilst others transform to the monoclinic form on cooling. Beyond about 4 h ageing at 1100° C the decomposition product in the grain boundaries began to influence the mechanical properties.
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Hannink, R.H.J. Microstructural development of sub-eutectoid aged MgO-ZrO2 alloys. J Mater Sci 18, 457–470 (1983). https://doi.org/10.1007/BF00560635
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DOI: https://doi.org/10.1007/BF00560635