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00367 STRESS ASSISTED PIT AND FISSURE COALESCENCE DURING EARLY STAGES OF STRESS CORROSION CRACKING IN AI-Li-Cu ALLOY AA2096

Product Number: 51300-00367-SG
ISBN: 00367 2000 CP
Author: Brian J. Connolly and John R. Scully
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Stress-assisted coalescence of pits has been examined in AI-Li-Cu alloy AA2096 after several aging heat treatments at 160°C in an alternate immersion 0.6M NaCl test. Pit formation was governed by electrochemical factors. Specifically, pits were formed in the matrix adjacent to bands of AI-Fe-Cu constituent particles in all tempers. Stress corrosion cracking (SCC) susceptible tempers exhibited pronounced pit coalescence promoted by stress and facilitated by intergranular corrosion. SCC resistant tempers also experienced stress dependent pit coalescence that was hypothesized to be promoted by pit tunneling and ductile rupture of remaining ligaments. The ramifications of larger corrosion fissures towards SCC are as follows: SCC susceptible tempers may experience higher applied stress intensities owing to larger (i.e., longer and deeper) fissures at a given remote stress in addition to possibly exhibiting greater stage II crack velocities. Keywords: aluminum-lithium-copper alloys, environmental cracking, stress corrosion crack initiation, pit coalescence, corrosion fissures
Stress-assisted coalescence of pits has been examined in AI-Li-Cu alloy AA2096 after several aging heat treatments at 160°C in an alternate immersion 0.6M NaCl test. Pit formation was governed by electrochemical factors. Specifically, pits were formed in the matrix adjacent to bands of AI-Fe-Cu constituent particles in all tempers. Stress corrosion cracking (SCC) susceptible tempers exhibited pronounced pit coalescence promoted by stress and facilitated by intergranular corrosion. SCC resistant tempers also experienced stress dependent pit coalescence that was hypothesized to be promoted by pit tunneling and ductile rupture of remaining ligaments. The ramifications of larger corrosion fissures towards SCC are as follows: SCC susceptible tempers may experience higher applied stress intensities owing to larger (i.e., longer and deeper) fissures at a given remote stress in addition to possibly exhibiting greater stage II crack velocities. Keywords: aluminum-lithium-copper alloys, environmental cracking, stress corrosion crack initiation, pit coalescence, corrosion fissures
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