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1. Bay, Rebecca Marie. The Effect of Sensitization on Corrosion Fatigue and Threshold Stress Intensity of AA5083-H131 Used for Marine Applications.

Degree: MS, Materials Science and Engineering, 2017, The Ohio State University

AA5xxx series Al-Mg alloys with greater than ~3.5% Mg experience an acceleration in fatigue crack growth rate (da/dN) as the level of sensitization increases and fatigue loading frequency (f) decreases when loaded in 3.5 wt% NaCl. AA5xxx series alloys, commonly used in naval applications, are known to exhibit decreased resistance to intergranular corrosion (IGC) and intergranular stress corrosion cracking (IGSCC) due to the formation of the active Al3Mg2-ß phase on grain boundaries. ß phase is metallurgically undesirable and forms on grain boundaries when slightly elevated in-service temperatures are experienced for prolonged periods of time, a phenomenon known as sensitization. Previous studies on AA5083-H131 corrosion fatigue (CF) show that da/dN is accelerated by an order of magnitude in the Paris regime for degrees of sensitization greater than or equal to 30 mg/cm2 at a f of 10 Hz and an R of 0.85, however, practical in-service naval ship fatigue loading occurs at 0.15 Hz and below.The results of this work show that, for sensitization levels examined above 33 mg/cm2, previous high-f results cannot be applied to low-f loading. High resolution fracture mechanics based experiments conducted at constant ¿K and R-ratio under full immersion in 3.5% NaCl show that da/dN for heavily sensitized material is highly f-dependent and increases with decreasing f by as much as three orders of magnitude over the as-received unsensitized condition. The result of this work suggests that high-f (10 Hz) testing severely underestimates da/dN for service-type loading of heavily sensitized material. Specifically, for sensitization levels of 37 mg/cm2 and above, da/dN increases with decreasing f by 2 to 3 orders of magnitude for 0.01 Hz loading over 1 Hz loading. Results from this study can enable advancement of service ship structural life prediction by generating data necessary to inform on safe versus unsafe sensitization levels. Advisors/Committee Members: Locke, Jenifer (Advisor).

Subjects/Keywords: Materials Science; Engineering; aluminum; corrosion fatigue; sensitization; IGSCC; AA5083

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APA (6th Edition):

Bay, R. M. (2017). The Effect of Sensitization on Corrosion Fatigue and Threshold Stress Intensity of AA5083-H131 Used for Marine Applications. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu149261363924202

Chicago Manual of Style (16th Edition):

Bay, Rebecca Marie. “The Effect of Sensitization on Corrosion Fatigue and Threshold Stress Intensity of AA5083-H131 Used for Marine Applications.” 2017. Masters Thesis, The Ohio State University. Accessed September 20, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu149261363924202.

MLA Handbook (7th Edition):

Bay, Rebecca Marie. “The Effect of Sensitization on Corrosion Fatigue and Threshold Stress Intensity of AA5083-H131 Used for Marine Applications.” 2017. Web. 20 Sep 2017.

Vancouver:

Bay RM. The Effect of Sensitization on Corrosion Fatigue and Threshold Stress Intensity of AA5083-H131 Used for Marine Applications. [Internet] [Masters thesis]. The Ohio State University; 2017. [cited 2017 Sep 20]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu149261363924202.

Council of Science Editors:

Bay RM. The Effect of Sensitization on Corrosion Fatigue and Threshold Stress Intensity of AA5083-H131 Used for Marine Applications. [Masters Thesis]. The Ohio State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu149261363924202

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