Abstract
The Al-3.40Mg-1.08Sc alloy plates were manufactured by selective laser melting (SLM) at platform temperatures of 35 °C and 200 °C, respectively, and the corrosion performance of them was studied along height direction. The results show that the corrosion resistance of the alloy plate built at platform temperature of 35 °C along height direction is basically the same due to a uniform microstructure; While the corrosion resistance of the alloy plate built at platform temperature of 200 °C along height direction is different. The evolution of microstructure and the distribution of secondary phases are investigated, and the results show that the Cu-rich phases in alloy play a key role on corrosion performance. At higher platform temperature, the cooling rate is relative slow and a certain degree of in situ ageing leads to the significantly different distribution of Cu-rich phases along grain boundary. Specimens built at the platform temperature of 200 °C are inclined to locate at the crossed grain boundary, rather than continuous segregation of Cu-rich phases along grain boundary that is built at platform temperature of 35 °C. Therefore, the corrosion resistance of Al-3.40Mg-1.08Sc alloy plate manufactured at platform temperature of 200 °C is higher, and presents a gradually decreasing trend along height direction.
摘要
采用激光选区熔化技术分别在基板温度35 °C和200 °C条件下制备了Al-3.40Mg−1.08Sc合金板材, 并对其沿高度方向上的耐蚀性能进行了研究. 结果表明, 在基板温度35 °C下制备的合金板材沿高度方向的微观组织均匀, 腐蚀抗性基本一致. 而在基板温度200 °C下制备的合金板材沿高度方向的耐蚀性不同. 通过对微观组织演变与第二相的分布特征进行分析, 发现合金内部富铜相对合金耐蚀性能有重要影响. 在较高的基板温度下, 相对较慢的冷却速度及一定程度的原位时效会导致沿晶界富铜相分布的显著不同, 在基板温度200 °C的试样中富铜相更倾向于在交叉晶界处分布, 而不是像35 °C制备的试样沿晶界连续分布. 因此, Al3.40Mg-1.08Sc 合金板材在基板温度200 °C下的抗腐蚀性更佳, 并沿高度方向呈现逐步降低的趋势.
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The overarching research goals were developed by WANG Jie-fang and ROMETSCH Paul. The writing, review, editing and conceptualization of the manuscript are done by LI Meng-jia and SHI Yun-jia. LIAN Juan is in charge of the preparation of specimens, the operation of corrosion resistance tests and the analysis of measured data. CAO Ling-fei is responsible for the characterization of STEM and 3DAP. ZHANG Guo-peng conducted and analyzed the mechanical performance results. All authors replied to reviewers’ comments and revised the final version.
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LI Meng-jia, LIAN Juan, CAO Ling-fei, SHI Yun-jia, ZHANG Guo-peng, WANG Jie-fang and ROMETSCH Paul declare that they have no conflict of interest.
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Foundation item: Project(51901207) supported by the National Natural Science Foundation of China; Project(2018M632796) supported by the China Postdoctoral Science Foundation; Projects(19A430024, 21A430037) supported by the Plan of Henan Key Scientific Research Project of Universities, China
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Li, Mj., Lian, J., Cao, Lf. et al. Effect of platform temperature on microstructure and corrosion resistance of selective laser melted Al-Mg-Sc alloy plate. J. Cent. South Univ. 29, 999–1014 (2022). https://doi.org/10.1007/s11771-022-4959-z
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DOI: https://doi.org/10.1007/s11771-022-4959-z