Accession Number:

ADA224506

Title:

HREM Studies of Coherent and Incoherent Interfaces in ZrO2-Containing Ceramics: A Preliminary Account

Descriptive Note:

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF METALLURGY AND MATERIALS SCIENCE

Report Date:

1985-01-01

Pagination or Media Count:

14.0

Abstract:

ZrO2-containing ceramics have attracted much attention in recent years because of their unusual mechanical and electrolytic properties. Their considerable potential for high-technology structural applications derives from the phenomenon of transformation toughening. Briefly, ZrO2, is polymorphic. The high-temperature form is cubic and is isostructural with CaF2 fluorite structure. At temperatures below 2250 C for pure ZrO2, or at temperatures considerably lower for ZrO2 alloys, the cubic polymorph c-ZrO2 transforms to a tetragonally distorted version of the fluorite structure. At still lower temperatures, t-ZrO2 transforms martensitically to the monoclinic structure shown in fig. 1c m-ZrO2. jes

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE