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:

1973-02-01

Pagination or Media Count:

36.0

Abstract:

The surface layer stress of titanium alloy 6Al4V and 5Al2.5Sn 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