Accession Number:

ADA170946

Title:

Metallurgical Variables Influencing the Corrosion Susceptibility of P/M (Powder Metallurgy) 7091 Aluminum/SiCw Composite.

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE

Personal Author(s):

Report Date:

1985-10-01

Pagination or Media Count:

38.0

Abstract:

Corrosion studies of a 20 vo SiCwPM 7091 aluminum composite material were performed. The plate material which was heat treated to the T-6 and T-7 temper by conventional methods, showed preferential corrosion of the surface layers up to 2 mm thick. The regions of corrosion susceptibility were determined to be due to improper processing and thermal treatments. Cold worked regions due to extrusion were not completely removed by the conventional solution treatment and thus appeared as more corrosion susceptible. Large void volume fraction and excessive segregation of SiCw was also noted. Electrochemical, microscopic and analytical techniques were used in these investigations. Attempts were made to remove the cold worked regions and study the resultant corrosion properties. Attempts were made to remove the cold worked regions and study the resultant corrosion properties. A comparative analysis of these results is discussed. Author

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE