An Investigation of the Processing, High Temperature Deformation and Fracture Characteristics of Superplastic Ceramics
Final rept. 15 Sep 1989-14 Sep 1990
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF APPLIED MECHANICS AND ENGINEERING SCIENCES
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The considerable interest in using ceramics for structural applications is constrained in large part by the difficulty in forming ceramics in useful component shapes. Superplasticity, a term referring to the ability of some fine grained crystalline materials to deform extensively, is being used commercially to form metallic components with complex shapes. It may be possible to use this phenomenon to form structural ceramics. This proposal outlines a three year, detailed, fundamental research program to investigate processing and mechanical properties of fine grained structural superplastic ceramics with the appropriate characterization. We will use an alkoxide synthesis technique to process the structural ceramics, and evaluate the high temperature mechanical properties in both tension and compression. The microstructural aspects of superplastic deformation and cavitation failure will be examined using x-ray diffraction, optical, scanning electron and transmission electron microscopy. It is anticipated that the present experimental study will substantially improve the understanding of superplasticity in structural ceramics, and this is likely to enhance the prospects of using this phenomenon for forming ceramics.
- Ceramics, Refractories and Glass