Effect of crystal orientation on corrosion behavior of directionally solidified Mg-4 wt% Zn alloy. Issue 7 (July 2018) - Jia, Hongmin
Abstract: Microstructure and crystallographic orientation of directionally solidified Mg-4 wt% Zn alloy were characterized by X-ray computed tomography (XCT) and electron backscatter diffraction (EBSD) in this study. Results reveal that Mg-4 wt% Zn alloy with dendritic microstructure exhibits typical { 0002 } basal texture along growth direction. Based on this, the effect of grain orientation on corrosion behavior of directionally solidified Mg-4 wt% Zn alloy in 0.9 wt% NaCl solution was investigated. Result shows that { 0002 } oriented planes have better corrosion resistance than { 11 2 ¯ 0 } and { 10 1 ¯ 0 } ones, which is attributed to a synergistic effect of surface energy, atomic packing density and the stability of oxidation film.