Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 26, Issue 9, Pages 2263-2275Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(16)64347-9
Keywords
aluminum alloy; heat treatment; precipitation behavior; Al-3(Sc, Zr) particles; electrochemical impedance spectroscopy
Categories
Funding
- National Basic Research Program of China [2012CB619503]
- National Natural Science Foundation of China [51475266, 51005134]
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The precipitation behavior, mechanical properties and corrosion resistance of a novel Al-Zn-Mg-Sc-Zr alloy aged at different time were studied by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile tests, potentiodynamic polarization and electrochemical impedance spectroscopy. The results revealed that with increasing aging time at 120 degrees C, the hardness and tensile strength of the alloy increased rapidly at first and then slightly decreased. The resistance of exfoliation corrosion (EXCO) and intergranular corrosion (IGC) increased gradually with increasing aging time. The same trend of corrosion properties was demonstrated by electrochemical polarization curves and EIS test. The characteristics of grain boundary precipitates and precipitate free zone (PFZ) had a significant influence on the mechanical and corrosion behaviors of the studied alloy. On the basis of TEM observations, the size of grain boundary precipitates and the width of PFZ became larger, and the distributed spacing of grain boundary precipitates was enhanced with increasing aging time.
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