Accession Number : AD0476264

Title :   A FUNDAMENTAL INVESTIGATION OF THE NATURE OF STRESS-CORROSION CRACKING IN ALUMINUM ALLOYS.

Descriptive Note : Summary rept. Jun 64-Apr 65,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH

Personal Author(s) : Haynie, F. H. ; Vaughan, D. A. ; Frost, P. D. ; Boyd, W. K.

Report Date : OCT 1965

Pagination or Media Count : 76

Abstract : The mechanism of stress-corrosion cracking in 7079 aluminum alloy was investigated by analysis of microstructural changes that occur during exposure to 3.5 per cent NaCl solution. During the corrosion reaction dislocation networks were generated within the grains and along strain-contour bands. Grain-boundary voids occurred where several of these bands originated or terminated. This suggests that the intragranular structure develops as a result of hydrogen entering the alloy and that the voids are propagated under applied load to form grain-boundary cracks. This study is in the preliminary stages and is being continued. (Author)

Descriptors :   *ALUMINUM ALLOYS), (*STRESS CORROSION, FRACTURE(MECHANICS), MICROSTRUCTURE, DEGRADATION, SOLUTIONS(MIXTURES), SODIUM COMPOUNDS, CHLORIDES, DEFECTS(MATERIALS), GRAIN BOUNDARIES, HYDROGEN EMBRITTLEMENT, CHEMICAL REACTIONS, WATER, PRODUCTION, HYDROGEN, ALUMINUM COMPOUNDS, OXIDES, THEORY, SURFACES, ENERGY, ELECTROCHEMISTRY, MICROSCOPY, ELECTRON MICROSCOPY, GRAIN SIZE, TENSILE PROPERTIES, ANALYSIS OF VARIANCE.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE