Accession Number:

ADA052723

Title:

Localized Hydrogen Analysis in Simulated Grain Boundaries of Aluminum Alloys Exposed to Stress Corrosion

Descriptive Note:

Final rept. 28 Apr 1975-28 Sep 1976

Corporate Author:

NAVAL AIR SYSTEMS COMMAND WASHINGTON DC TECHNOLOGY ADMINISTRATORS (RESEARCH)

Personal Author(s):

Report Date:

1978-02-01

Pagination or Media Count:

54.0

Abstract:

The role of hydrogen in the stress corrosion attack of 7000 series aluminum alloys was investigated using sputtered filmsubstrate samples to simulate the grain boundary constituents in these alloys. Localized hydrogen measurements were made in the film, interface region, and substrate using the Lithium Nuclear Microprobe for Hydrogen LNMH technique. Hydrogen concentrations were measured in samples of pure aluminum film7075 substrate, 7475 film7075 substrate, and MgZn2 film7075 substrate for as-sputtered, corrosion exposed, and stress corrosion exposed conditions as well as after stress removal. A substantial hydrogen concentration increase was observed in the interface region of MgZn2 film7075 substrate samples exposed to stress corrosion smaller increases were introduced in the interface region of 7475 film7075 substrate samples no increase occurred in aluminum film7075 substrate samples.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE