Anisotropic response in corrosion behavior of laser powder bed fusion Al-Mn-Mg-Sc-Zr alloy. (November 2022)

• Record Type: Journal Article
• Authors: Zhang, Zequn; Sun, Jin'e; Xia, Jiuyang; Wu, Junsheng; Chen, Zhibin; Zhang, Baicheng; Li, Ziqi; Li, Xiaogang; Zhang, Bowei
• Is Part Of: Corrosion science. Volume 208(2022)
• Publication Date: 2022-11
• Subjects: LPBF -- Al-Mn-Mg-Sc-Zr -- Localized corrosion -- Precipitates; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110634
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Corrosion behavior on the building plane (XY-plane) and building direction plane (XZ-plane) of laser powder bed fusion (LPBF) Al-Mn-Mg-Sc-Zr alloy was investigated based on microstructure characterization coupled with corrosion measurements. The results demonstrate that localized corrosion preferentially occurs at the molten pool boundaries of both planes, where the distribution of abundant micro-cathode Al3 (Sc, Zr) precipitates act as the predominant role. In contrast, the micro-anode Al6 (Mn, Fe) precipitates are more likely to be dissolved prior to the matrix nearby, thus showing little impact on the corrosion behavior of the LPBF alloy. Highlights: Corrosion behavior on different planes of LPBF Al-Mn-Mg-Sc-Zr alloy is investigated. Localized corrosion prefers to occur at the molten pool boundaries of both planes. High residue stress may also contribute to the localized corrosion. Al3 (Sc, Zr) precipitates act as micro-cathode compared to the substrate. Al6 (Mn, Fe) precipitates are more likely to be dissolved prior to the matrix nearby.