Stress Corrosion Cracking of Wrought and P/M High Strength Aluminum Alloys.
Abstract
The combined results of the first two years of the program are presented, with emphasis on the stress corrosion cracking and hydrogen embrittlement of the P/M X-7090 Al alloy. More complete results on 7075 are also given. In particular, the role of temper and loading mode and susceptibility were examined for three test methods--time to failure of notched round bar specimens in a brine solution; straining electrode tests on notched round specimens under cathodic charging; and tensile tests on hydrogen pre-charged notched round specimens. Another study examined the role of concurrent recovery processes during slow strain rate testing of cathodically charged 7075 and established that hydrogen outgassing is not a factory in the recovery, which instead is due to internal rearrangement of hydrogen to various trap sites. Also, a successful measurement of hydrogen diffusivity in aluminum has been made at room temperature using sandwich type specimens. The value obtained, about 10 to the -15th power cm sq/s is one of the first successful measurements of this type.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1983
- Accession Number
- ADA126462
Entities
People
- A. W. Thompson
- I. M. Bernstein
- R. E. Swanson
Organizations
- Carnegie Mellon University