Corrosion behaviour of bulk ultra-fine grained AZ91D magnesium alloy fabricated by equal-channel angular pressing
2010; Elsevier BV; Volume: 53; Issue: 1 Linguagem: Inglês
10.1016/j.corsci.2010.09.044
ISSN1879-0496
AutoresDan Song, Aibin Ma, Jinghua Jiang, Peng Lin, Donghui Yang, J. F. Fan,
Tópico(s)Aluminum Alloys Composites Properties
ResumoEffect of microstructure change on corrosion behaviour of equal-channel angular pressed (ECAPed) AZ91D Mg alloy was investigated. The ECAPed alloy with ultra-fine grained (UFG) α-phase matrix and refined β-phase particles displays a significantly lower corrosion resistance, resulting in more pits after in-situ corrosion, higher mass-loss rate immersed in NaCl solution, larger Icorr values in polarization curves and lower fitted Rt values in EIS plots. Two factors weaken the corrosion resistance: the first is the strains-induced crystalline defects providing the α-phase matrix more corrosion activation, the second is the refined β-phase particles losing barrier to the corrosion propagation in α-phase matrix.
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