Accession Number : AD0761207

Title :   The Influence of a Heat Treatment on the Stress-Corrosion Susceptibility of a Ternary Al-5.3%Zn-2. 5%Mg Alloy.

Descriptive Note : Technical rept.,

Corporate Author : MARTIN MARIETTA LABS BALTIMORE MD

Personal Author(s) : Sedriks,A. J. ; Green,J. A. S. ; Novak,D. L.

Report Date : MAY 1973

Pagination or Media Count : 13

Abstract : The influence of heat treatment on the stress-corrosion susceptibility of a ternary Al-5.3%Zn-2.5%Mg alloy has been examined in terms of four variables. These variables are the cooling rate from the solution treatment temperature, holding time at room temperature, aging time at a temperature below the G.P. zone solvus and aging time at a temperature above the G.P. zone solvus. Variables which markedly influence the stress-corrosion susceptibility of the Al-Zn-Mg alloys were found to be the cooling rate after solution treatment and the aging time at temperature above the G.P. zone solvus. These results are discussed in terms of variations in the grain boundary microstructure. (Author)

Descriptors :   (*ALUMINUM ALLOYS, STRESS CORROSION), (*HEAT TREATMENT, ALUMINUM ALLOYS), HEAT TREATMENT, CORROSION INHIBITION, GRAIN BOUNDARIES, MICROSTRUCTURE, AGING(MATERIALS), CRACKS

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE