Accession Number : AD0774496

Title :   Stress Corrosion Cracking Properties of Two Aluminum-Magnesium Alloys.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Bogar,F. D. ; Fujii,C. T.

Report Date : JAN 1974

Pagination or Media Count : 14

Abstract : The SCC behavior of two Alcoa Al-Mg alloys -- a commercial alloy, 5456-H117, and an experimental alloy, N-H117, is described. These materials were studied in the as-received and aged conditions for susceptibility to cracking in 3.5% NaCl solution. Double cantilever beam specimens were machined from the one-inch thick plates of the two alloys in the SL, TL, and LT orientations. All of the specimens were fatigue pre-cracked to facilitate initiation of a 'pop-in' crack when bolt loaded to start the SCC tests. After three days immersion in the corrodent, the specimens were mechanically broken apart and the fracture surface examined for visual evidence of SCC. The as-received specimens were insensitive to SCC in these tests with the exception of one N-H117 specimen. All of the aged specimens of both alloys were susceptible to SCC. (Author)

Descriptors :   *Stress corrosion, *Aluminum alloys, *Magnesium alloys, Sodium chloride, Crack propagation, Aging(Materials)

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE