Stress Corrosion Cracking of Al-Mg Alloy 5083 Sensitized at Low Temperature
- 19 August 2015
- journal article
- research article
- Published by Association for Materials Protection and Performance (AMPP) in Corrosion
- Vol. 72 (2) , 221-241
Abstract
Intergranular stress corrosion cracking (IGSCC) in Al-Mg alloy 5083-H131 is characterized for slow-rising stress intensity loading in NaCl solution at a near-open circuit potential. The susceptible S-L orientation isolates the controlling-deleterious effect of grain boundary β (Al3Mg2) precipitates. Low temperature sensitization produces severe IGSCC, provided that the degree of sensitization (DoS, measured by nitric acid mass loss) is above a critical level of 9 to 12 mg/cm2. Fatigue precrack tip intergranular corrosion occurs, threshold stress intensity for IGSCC falls, and Stage II crack growth rate rises as single functions of mass loss for sensitization at 60°C, 80°C, or 100°C. The DoS dependence of IGSCC is explained with the coupled crack tip dissolution-hydrogen environment embrittlement mechanism. IGSCC occurs above a critical DoS when the amount of β dissolution is sufficient for hydrolytic-crack acidification promoting H uptake and β boundary embrittlem...Keywords
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