Journal
CORROSION SCIENCE
Volume 208, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110634
Keywords
LPBF; Al-Mn-Mg-Sc-Zr; Localized corrosion; Precipitates
Funding
- National Natural Science Foundation of China [51901018]
- Young Elite Scientists Sponsorship Program by China Association for Science and Technology [2019QNRC001]
- Fundamental Research Funds for the Central Universities [FRF-AT-20-07, 06500119]
- Natural Science Foundation of Beijing Municipality [2212037]
- National Science and Technology Resources Investigation Program of China [2019FY101400]
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Corrosion behavior on both the building plane and building direction plane of LPBF Al-Mn-Mg-Sc-Zr alloy was investigated. Localized corrosion primarily occurred at the molten pool boundaries, where abundant micro-cathode precipitates played a dominant role.
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.
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