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The residual stress and strength characteristics of partial stabilized zirconia induced by shot peening with soft aluminium particles were evaluated by the Xray stress measurement method. It was conrmed that a compressive residual stresses ranging from 250 to 340 MPa were induced on to the plates of partially stabilized zirconia by the soft shot peening treatment. It was also conrmed that the modilation of surface defects and surface roughness after shot peening with soft aluminium particles was insignicant. Furthermore, the bending strength and the Weibull modulus of the shot peened partially stabilized zirconia was improved by compressive residual stresses.

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