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Avoidance of stress corrosion susceptibility in high strength aluminum alloys by control of grain boundary and matrix microstructureThe relation of microstructure to the mechanical strength and stress corrosion resistance of highest strength and overaged tempers of BAR and 7050 aluminum alloys was investigated. Comparison is made with previously studied 7075 aluminum alloy. Optical microscopy, transmission electron microscopy, and differential scanning calorimetry were used to characterize the grain morphology, matrix microstructure, and grain boundary microstructure of these tempers. Grain boundary interparticle spacing was significant to stress corrosion crack propagation for all three alloys; increasing interparticle spacing led to increased resistance to crack propagation. In addition, the fire grain size in Bar and 7050 appears to enhance crack propagation. The highest strength temper of 7050 has a comparatively high resistance to crack initiation. Overall stress corrosion behavior is dependent on environment pH, and evaluation over a range of pH is recommended.
Document ID
19740026819
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Adler, P. (Grumman Aerospace Corp. Bethpage, NY, United States)
Deiasi, R. (Grumman Aerospace Corp. Bethpage, NY, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1974
Subject Category
Materials, Metallic
Report/Patent Number
NASA-CR-120468
RE-468
Accession Number
74N34932
Funding Number(s)
CONTRACT_GRANT: NAS8-28986
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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