Accession Number : AD0760529

Title :   Effect of Vacuum Environment on Mechanical Behavior.

Descriptive Note : Annual rept. Jan 71-Jan 73,

Corporate Author : MARTIN MARIETTA AEROSPACE DENVER COLO DENVER DIV

Personal Author(s) : Kramer,Irvin R.

Report Date : FEB 1973

Pagination or Media Count : 36

Abstract : The surface layer stress of titanium alloy (6Al/4V and 5Al/2.5Sn) was measured in methanol-chloride solutions as a function of voltage. The surface layer stress was found to increase markedly as the specimen became more anodic. It is proposed that stress-corrosion cracking is associated with the formation of a surface layer of critical strength to support a pileup of dislocations to cause fracture. The stress corrosion behavior of titanium and aluminum (2014-T6) was determined on specimens with and without the surface layer. A marked increase in the stress corrosion cracking resistance was achieved by eliminating the surface layer. (Author)

Descriptors :   (*STRESS CORROSION, *CRACK PROPAGATION), (*TITANIUM ALLOYS, STRESS CORROSION), (*ALUMINUM ALLOYS, STRESS CORROSION), FATIGUE(MECHANICS), VACUUM, STRESSES

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE