Effects of precipitation strengthening heat treatment for Al-Mg alloy

The corrosions resulting from defects in painting layers frequently occur in Al alloys, so the application of corrosion preventing systems is also very important. Optimum conditions in terms of electrochemistry in relation to solution treatment, quenching and artificial aging treatment were establis...

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Published in:Transactions of Nonferrous Metals Society of China 2011-06, Vol.21 (6), p.1218-1224
Main Authors: KIM, Seong-Jong, JANG, Seok-Ki, HAN, Min-Su, KIM, Seong-Kwon, KIM, Jong-Sin
Format: Article
Language:English
Subjects:
Al alloy
Aluminum base alloys
China
Corrosion
Corrosion prevention
electrochemistry
Elongation
Heat treatment
mechanical property
Precipitation hardening
precipitation strengthening heat treatment
slow strain rate test
Tensile strength
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Summary:The corrosions resulting from defects in painting layers frequently occur in Al alloys, so the application of corrosion preventing systems is also very important. Optimum conditions in terms of electrochemistry in relation to solution treatment, quenching and artificial aging treatment were established in order to optimize precipitation strengthening conditions intended to enhance the strength of Al alloys. Slow strain rate tests (SSRT) at various applied potentials were conducted in potential range from −1.8 to −0.5 V. The results show that the maximum tensile strengths, elongations and time-to-fracture are shown to be high values. After precipitation strengthening heat treatment, a tendency appear that time-to-fracture increases as elongation increases. In the potential range from −1.3 V to −0.7 V, the specimens show excellent mechanical properties, and thus this range is considered to be a corrosion prevention range.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)60845-5