Accession Number:

ADA222931

Title:

Theory of Ceramic/Zirconia Composites: Toughening, Strengthening, and Synergism

Descriptive Note:

Corporate Author:

HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES

Personal Author(s):

Report Date:

1990-04-01

Pagination or Media Count:

11.0

Abstract:

A review is given of recent theoretical results concerning toughening and strengthening in brittle ceramics reinforced with dilatantly transforming zirconia particles. Small-scale analysis of long dominant cracks provides resistance curves that exhibit peak fracture toughnesses for finite amounts of crack growth. Similar results for the tensile fracture strengths of short cracks have implications for transformation strengthening. The interaction due to the presence of both transforming particles and ductile metal particles can result in synergistic reinforcing effects over a parametric range of material properties. Keywords Ceramic materials, Zirconium alloys, Particle reinforcements, Mechanical properties, Crystal structure, Transformation toughening, Transformation strengthening, Synergism.

Subject Categories:

  • Inorganic Chemistry
  • Refractory Fibers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE