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An increment plasticity formulation is established for the transformation plastic behavior of zirconia-toughened ceramics based on micromechanics of heterogeneous media. Mori-Tanaka estimates are established for the overall plastic strains and the overall yield stresses. The plastic flow function is determined in terms of the transformation twinning of a single zirconia particle embedded in an infinite matrix with the average matrix stresses. Numerical examples are given for the transformation yielding of ceramics with aligned zirconia particles under uniaxial loading.