Phase Transformation Introduced by Mechanical and Chemical Surface Preparations of Tetragonal Zirconia Polycrystals

Authors

  • Nibedita Mitra,

    1. Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
    2. Materials Science Division, National Aeronautical Laboratory, Bangalore, India
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      Indian Institute of Science.

  • Kalyani Vijayan,

    1. Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
    2. Materials Science Division, National Aeronautical Laboratory, Bangalore, India
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    • National Aeronautical Laboratory.

  • B. N. Pramila Bai,

    1. Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
    2. Materials Science Division, National Aeronautical Laboratory, Bangalore, India
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      Indian Institute of Science.

  • S. K. Biswas

    1. Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
    2. Materials Science Division, National Aeronautical Laboratory, Bangalore, India
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      Indian Institute of Science.


  • G. Behrens—contributing editor

  • Supported by the Department of Science and Technology, Government of India.

Abstract

Cutting of Y2O3-doped TZP rods by a low-speed diamond saw introduces an unidentified, metastable phase X (x-ZrO2) coexisting with the tetragonal (t-ZrO2) and the monoclinic (m-ZrO2) phases initially present in the sample. Further mechanical deformation of the cut surface by indentation or polishing sustains the x-ZrO2. Chemical etching removes the x-ZrO2 and increases the m-ZrO2content.

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