Advances in Ceramic Matrix Composites VII- Proceedings of the Ceramic Matrix Composites

Symposium, 103rd Annual Meeting of the American Ceramic Society, pp. 89-100. Edited by N. P.

Bansal, J.P. Singh, and H.-T. Lin,. The American Ceramic Society, Westerville, OH, 2001.

DEVELOPMENT OF SUPERPLASTIC Al₂O₃/Y-TZP DUPLEX LAMINATES

Todd Sullivan, Jue Wang, Desiderio Kovar, and Eric M. Taleff

Materials Science and Engineering Program and

Department of Mechanical Engineering

University of Texas at Austin

Austin, TX 78712

ABSTRACT

Duplex laminate composite structures composed of high-purity Al2O3 and 3YTZP (3 mol % yttria-partially stabilized, tetragonal zirconia polycrystals) were processed by tape casting. Duplex particulate composites of various compositions and laminate composites of these were manufactured. Fine grain sizes and high densities were achieved and proved to be favorable for superplasticity. Strain rate-change tests were conducted to evaluate the dependence of flow stress in the laminate and particulate composites on strain rate. The data show that orientation of the layers relative to the applied stress has only a small effect on the deformation behavior. Low flow stresses were observed for some of the composites and the low flow stresses are expected to be conducive to large elongation-to-failure.