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Effects of annealing temperature on stress corrosion susceptibility of AA5083–H15 alloys

Published online by Cambridge University Press:  27 April 2016

Chun-Hung Yen
Affiliation:
Department of Mechanical Engineering, National Central University, Jhongli 320, Taiwan
Chih-Ting Wu
Affiliation:
Department of Vehicle Engineering, Army Academy R.O.C., Jhongli 320, Taiwan
Yen-Hao Chen
Affiliation:
Department of Mechanical Engineering, National Central University, Jhongli 320, Taiwan
Sheng-Long Lee*
Affiliation:
Department of Mechanical Engineering, National Central University, Jhongli 320, Taiwan
*
a)Address all correspondence to this author. e-mail: shenglon@cc.ncu.edu.tw
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Abstract

Effects of annealing temperature on stress corrosion susceptibility of AA5083–H15 alloys were studied by annealing specimens at 150, 200, 250, 300, and 350 °C before sensitization. Nitric acid mass loss testing and slow strain rate testing were conducted to investigate intergranular corrosion (IGC) and stress corrosion cracking (SCC). Results indicate that H15 alloy was less susceptible to IGC, but this alloy had the highest susceptibility to IGC and SCC after sensitization. Due to the continuous precipitation of β phase, the sensitized 150 and 200 °C alloys were highly susceptible to IGC and SCC. The 250 °C alloy was less susceptible to IGC because of the absence of the precipitation of β phase. After sensitization, this alloy was also less susceptible to IGC and SCC on account of the discontinuous precipitation of β phase. The sensitized 300 and 350 °C alloys were susceptible to IGC but less susceptible to SCC because of their lower strength and higher elongation.

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Copyright
Copyright © Materials Research Society 2016 

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