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The effect of subzero treatment on the microstructure and mechanical properites of Y_2O_3-ZrO_2 ceramic have been investigated by TEM,X-ray diffraction and test of mechanicalproperties.It was shown that the microstructre of 3Y-PSZ after subzero treatment byliquid nitrogen exhibits very long and parallel laths of m-phase and some microcracksaround the larger and finer lath of m-phase may be discovered.Suitable subzero treatmentcan improve the strength and toughness of Y-PSZ efficiently because of decreasing thestability of t-phase and incresing the amount of t-m transformation when exerting astress.However,when the time of subzero treatment exceeds,the over aging effect mayarise.which can decrease the strength and toughness of the material.
The effect of subzero treatment on the microstructure and mechanical properites of Y 2 O 3 -ZrO 2 ceramic have been investigated by TEM, X-ray diffraction and test of mechanical properties. It was shown that the microstructre of 3Y-PSZ after subzero treatment byliquid nitrogen exhibits very long and parallel laths of m-phase and some microcracksaround the larger and finer lath of m-phase may be discovered. SUitable subzero treatmentcan improve the strength and toughness of Y-PSZ efficiently because of decreasing thestability of t-phase and incresing the amount of tm transformation when exerting astress.However, when the time of subzero treatment exceeds, the over aging effect mayarise.which can decrease the strength and toughness of the material.