This article is cited in 14 papers

Mechanical properties, strength physics and plasticity

Structure and mechanical properties of crystals of partially stabilized zirconia after thermal treatment

M. A. Borik^a, V. T. Bublik^b, A. V. Kulebyakin^a, E. E. Lomonova^a, F. O. Milovich^b, V. A. Myzina^a, V. V. Osiko^a, S. V. Seryakov^b, N. Yu. Tabachkova<sup>b

a</sup> Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^b National University of Science and Technology «MISIS», Moscow

Abstract: The phase composition and morphology of the twin structure of the Y$_2$О$_3$-stabilized zirconia crystals (from 2.8 to 4.0 mol%) after the thermal treatment at 1600$^\circ$C have been investigated by X-ray diffractometry and transmission electron microscopy. It is shown that as the concentration of the stabilizing Y$_2$О$_3$ impurity increases, the character of the twin structure changes, and the amount of the untransformed phase $t'$ increases. The dependence of the hardness and crack resistance of the crystals of partially stabilized zirconia on the Y$_2$О$_3$ concentration and the indenter orientation is investigated using the microindentation method. The sample with the lowest concentration of the stabilizing Y$_2$О$_3$ impurity turned out the most crack resistant. This can be explained by a high content of tetragonal phase $t$ in it, which provides the transformation strengthening mechanism of the material, and by a more multilevel character of twinning.

Received: 28.01.2013

 English version: Physics of the Solid State, 2013, 55:8, 1690–1696

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