Accession Number : AD0638621

Title :   THE OPERATION OF BRITTLE FRACTURE MECHANISMS IN DUCTILE METAL COMPOSITES.

Descriptive Note : Interim scientific rept.

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE AEROELASTIC AND STRUCTURES RESEARCH LAB

Personal Author(s) : Kershaw,John P. ; Shepard,Lawrence A.

Report Date : DEC 1965

Pagination or Media Count : 24

Abstract : Experiments with W-Fe-Ni and Fe-Ag composites are described. The former consists of continuously bonded rounded tungsten grains in a FCC solid solution matrix of W-Fe-Ni, while the latter consists of a regular grain structure with silver dispersed in the grain boundaries and through the grains. Griffith cracks, concentrated slip, and the effects of twin intersection in these composites are described. It is concluded that the softer matrix phase provides a chechanism whereby the stress concentrations in the harder phase are relieved, thus leading to ductile behavior of the composite. (Author)

Descriptors :   (*POWDER ALLOYS, *FRACTURE(MECHANICS)), MICROSTRUCTURE, BRITTLENESS, TUNGSTEN ALLOYS, IRON ALLOYS, NICKEL ALLOYS, DUCTILITY, SILVER ALLOYS, SOLID SOLUTIONS, GRAIN STRUCTURES(METALLURGY), STRESSES

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE