Accession Number : AD0709043

Title :   USE OF PRECRACKED SPECIMENS IN SELECTING HEAT TREATMENTS FOR STRESS-CORROSION RESISTANCE IN HIGH-STRENGTH ALUMINUM ALLOYS,

Corporate Author : BOEING CO RENTON WASH COMMERCIAL AIRPLANE GROUP

Personal Author(s) : Hyatt,Michael V.

Report Date : NOV 1969

Pagination or Media Count : 21

Abstract : Three techniques using precracked double cantilever beam (DCB) specimens were employed to measure resistance to stress-corrosion crack propagation as a function of the degree of overaging in the alloy 7075. Two techniques used single DCB specimens containing aging gradients along their lengths. The third technique used multiple DCB specimens, each one having a different heat treatment. All three techniques gave similar results, but stress-corrosion resistance as a function of heat treatment was determined most rapidly using separate DCB specimens having different heat treatments. Data from this study suggest that DCB specimens would be useful in several other stress-corrosion study areas, including that of thermomechanical treatments for aluminum alloys. (Author)

Descriptors :   (*ALUMINUM ALLOYS, *STRESS CORROSION), (*HEAT TREATMENT, ALUMINUM ALLOYS), CANTILEVER BEAMS, CRACK PROPAGATION, AGING(MATERIALS), QUENCHING

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE