Microstructure and corrosion properties of micro-beam plasma remelted Mg-12Dy-1.1Ni alloy
Microstructure and corrosion properties of micro-beam plasma remelted Mg-12Dy-1.1Ni alloy
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DOI：
10.1007/s11771-023-5225-8
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发表时间：
2023-01
影响因子：
4.4
通讯作者：
Jing Jiang;Siqi Chen;Jia-rui Gu;Guang-li Bi;Jianmei Huang;Yuandong Li;Tijun Chen;Ying Ma
中科院分区：
文献类型：
--
作者：
Jing Jiang;Siqi Chen;Jia-rui Gu;Guang-li Bi;Jianmei Huang;Yuandong Li;Tijun Chen;Ying Ma
研究了微束等离子重熔Mg-12 Dy-1.1Ni（wt%）合金的显微组织和腐蚀性能。铸态合金主要由α-Mg、具有18 R长周期堆垛有序（LPSO）结构的片状Mg 12 DyNi相和Mg 24 Dy 5相组成。微束等离子重熔（MPR）后，铸态合金的晶粒尺寸显著细化至11 μm，18 R-LPSO相含量从18.3%增加到26.0%，呈连续网状分布。电化学和浸泡试验结果表明，MPRMed合金在0.1mol/LNaCl溶液中的质量损失率为0.31g/（cm2.d），腐蚀电流密度为605.3 μA/cm 2，MPR后降低了约38.5%。MPRMed合金耐蚀性的提高主要归因于其组织均匀、腐蚀产物致密和18 R-LPSO相连续分布。
Microstructure and corrosion properties of micro-beam plasma remelted (MPRMed) Mg-12Dy-1.1Ni (wt%) alloy were investigated. The as-cast alloy was mainly composed ofα-Mg, lamellar Mg12DyNi phase with a 18R-long period stacking order (LPSO) structure, and Mg24Dy5phase. After micro-beam plasma remelting (MPR), the grain size of the as-cast alloy was remarkably refined to 11 µm, and the amounts of 18R-LPSO phase increased from 18.3% to 26.0% and distributed as continuous network. The electrochemical and immersion tests indicated that the MPRMed alloy exhibited a lower mass loss rate 0.31 g/(cm2·d) and corrosion current density (605.3 µA/cm2, and ∼38.5% reduction after MPR) than the as-cast alloy in 0.1 mol/L NaCl solution. The improved corrosion resistance of the MPRMed alloy was primarily ascribed to the uniform microstructure, denser corrosion products and continuous distribution of 18R-LPSO phase.