Accession Number:

ADA076439

Title:

Microstructurally Developed Toughening Mechanisms in Ceramics--Transformation Toughening in the A1 sub 2 O sub 3/ZrO sub 2 Composite System.

Descriptive Note:

Technical rept. no. 7, 1 Jun 78-31 May 79,

Corporate Author:

ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s):

• Lange,F. F.

Report Date:

1979-10-01

Pagination or Media Count:

30.0

Abstract:

Three A1203ZrO2 composites series, containing 0, 2, and 7.5 mole Y203, respectively, were fabricated. For the A1203ZrO22MoY203 series, tetragonal ZrO2 was retained from one end-member to the other. Significant increases in fracture toughness and strength were observed for materials in this system. Strengths decreased with increasing temperature. These results are consistent with previous theoretical predictions. Author

Descriptors:

• *STRENGTH(MECHANICS)
• *FRACTURE(MECHANICS)
• *CERAMIC MATERIALS
• *ALUMINUM OXIDES
• *YTTRIUM OXIDES
• *ZIRCONIUM OXIDES
• TEMPERATURE
• MICROSTRUCTURE
• PHASE TRANSFORMATIONS
• MATHEMATICAL PREDICTION
• MARTENSITE

Subject Categories:

• Ceramics, Refractories and Glass
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE