|Correlative change of corrosion behavior with the microstructure of AZ91 Mg alloy modified with Y additions|
|R. L.; Zhang Jia, M.; Zhang, L. N.; Zhang, W.; Guo, F.
|Source Publication||Journal of Alloys and Compounds
|Abstract||Microstructure characterization of the AZ91 magnesium alloys with or without rare earth element yttrium (Y) has been revealed by SEM, EDS and EPMA. Some Y-rich phases can be found in the magnesium alloys with Y additions. The fraction of beta-Mg17Al12 phase obvious decreases and turns into granular distribution with the increase of Y addition instead of original wet distribution along grain boundaries. The results of the potentiodynamic polarization tests show that the corrosion resistance of AZ91 alloy is improved with appropriate Y additions. But an in-situ observation of 3D digital microscopy for the initial stage of corrosion of the magnesium alloy with 0.9%Y addition shows that Y-rich phases act as cathodic effect and the a phases in the vicinity of them acting as anode are corroded. So the additions of Y have a beneficial effect that can depress the overall corrosion of AZ91 alloy, whereas its harmful effect is related to Y-rich phases because they present the highest Volta potential difference from the adjacent matrix and they can drive galvanic corrosion. (C) 2015 Elsevier B.V. All rights reserved.|
; zhang, ming
; zhang, lina
; guo, feng] inner mongolia univ technol, coll mat sci & engn, hohhot 010051, inner mongolia, peoples r china. [zhang, wei] chinese acad sci, inst met res, lab corros & protect, shenyang 110016, peoples r china.
; jia, rl (reprint author), inner mongolia univ technol, coll mat sci & engn, hohhot 010051, inner mongolia, peoples r china.
R. L.,Zhang Jia, M.,Zhang, L. N.,et al. Correlative change of corrosion behavior with the microstructure of AZ91 Mg alloy modified with Y additions[J]. Journal of Alloys and Compounds,2015,634:263-271.
R. L.,Zhang Jia, M.,Zhang, L. N.,Zhang, W.,&Guo, F..(2015).Correlative change of corrosion behavior with the microstructure of AZ91 Mg alloy modified with Y additions.Journal of Alloys and Compounds,634,263-271.
R. L.,et al."Correlative change of corrosion behavior with the microstructure of AZ91 Mg alloy modified with Y additions".Journal of Alloys and Compounds 634(2015):263-271.
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