Accession Number : AD0715988

Title :   The Brittle Fracture of Alloyed Alumina.

Descriptive Note : Final technical rept. Aug 69-Aug 70,

Corporate Author : NEWCASTLE-UPON-TYNE UNIV (ENGLAND) DEPT OF METALLURGY

Personal Author(s) : Congleton,J. ; Linnett,L. M. ; Petch,N. J.

Report Date : SEP 1970

Pagination or Media Count : 25

Abstract : A hot-pressing facility was commissioned and fabrication procedures established for the manufacture of high density, fine grained pure and alloyed alumina. Mechanical testing of the products, by four point bend tests, has commenced. A suitable chemical analysis procedure for determining Cr in alumina has been developed that is accurate to within plus or minus 0.5 micrograms Cr. Additionally, a theoretical consideration of the notch strength of alumina has been developed. This is based on a simple model for fracture and suggests that the mechanistic details of fracture nucleation close to the notch tip are of significant importance in determining the relationship between notch-strength and stress concentration factor at a blunt notch. (Author)

Descriptors :   (*CERMETS, *ALUMINA), HOT PRESSING, CHROMIUM, FRACTURE(MECHANICS), BRITTLENESS, NOTCH SENSITIVITY, GREAT BRITAIN

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE