Accession Number : AD0766683

Title :   Effect of Tensile Deformation and Heat Treatment on the Stress Corrosion Susceptibility of an Al-ZN-Mg Alloy.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS

Personal Author(s) : Shastry,C. Ramdadeva ; Levy,Milton

Report Date : JUL 1973

Pagination or Media Count : 27

Abstract : 3.5 PERCENT SODIUM CHLORIDE SOLUTION WAS STUDIED BY BENT BEAM TYPE STRESS CORROSION TESTS. The results indicated that for specimens without a room temperature preaging treatment, a 2 percent plastic deformation before the final aging at 150C increased the stress corrosion resistance. No such improvement resulted from a 5 percent deformation. The difference in the stress corrosion susceptibility for the two treatments was attributed to the difference in the dislocation and precipitate distributions in the matrix in the two cases. For both the undeformed specimens and specimens deformed by 2 percent, preaging at room temperature resulted in lower values of stress corrosion time to failure. This reduction in stress corrosion resistance was attributed to incomplete elimination, during aging, of grain boundary solute segregation in the preaged specimens. (Author)

Descriptors :   (*ALUMINUM ALLOYS, *STRESS CORROSION), HEAT TREATMENT, DEFORMATION, AGING(MATERIALS), ZINC ALLOYS, MAGNESIUM ALLOYS, MICROSTRUCTURE, ELECTRON MICROSCOPY

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE