, Volume 20, Issue 3, pp 1085-1092

The modulated structure formed by isothermal ageing in ZrO2 -5.2 mol % Y2 O3 alloy

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The modulated structure produced by isothermal ageing of ZrO2-5.2 mol % Y2O3 alloy was examined mainly by electron microscopy. It was found that the modulated structure was formed at ageing temperatures between 1400 and 1600° C, but not at 1700° C. The structure is developed by spinodal decomposition, which produces compositional fluctuation in the elastically soft 〈111〉 direction in cubic zirconia. The hardness increase caused by the development of modulated structure during ageing is larger than the hardening by precipitation of tetragonal phase in the cubic matrix.