Accession Number : AD0657379

Title :   THE EMBRITTLEMENT OF COPPER-17 ATOMIC % ALUMINUM ALLOY BY LIQUID MERCURY.

Descriptive Note : Technical rept.,

Corporate Author : MCMASTER UNIV HAMILTON (ONTARIO) DEPT OF METALLURGY AND METALLURGICAL ENGINEERING

Personal Author(s) : Ives,M. B. ; Hancock,P. C.

Report Date : AUG 1967

Pagination or Media Count : 119

Abstract : The role of plastic deformation in the initiation and propagation of cracks in Cu-17A1 alloy embrittled by liquid mercury has been studied. It is proposed that extensive plastic deformation and work hardening must occur at the crack-tip during propagation in order to raise the local flow stress to a critical level at which the maximum normal stress is equal to the cohesive strength. Strong indication is given that a 'critical applied stress' criterion for fracture is not applicable for this material. Micro-cracks are formed at weakened grain boundaries and a period of stable crack growth made over a period of increasing applied stress may be necessary before the crack is long enough to become unstable. (Author)

Descriptors :   (*EMBRITTLEMENT, *LIQUID METALS), (*COPPER ALLOYS, EMBRITTLEMENT), DEFORMATION, CRACKS, STRESSES, FRACTURE(MECHANICS), MERCURY, HARDENING, PLASTIC PROPERTIES, MICROSTRUCTURE, GRAIN STRUCTURES(METALLURGY), ALUMINUM ALLOYS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE