Effect of Different Scale Precipitates on Corrosion Behavior of Mg–10Gd–3Y–0.4Zr Alloy

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英文篇名：Effect of Different Scale Precipitates on Corrosion Behavior of Mg–10Gd–3Y–0.4Zr Alloy 作者：Shuang ; Yu ; Rui-Ling ; Jia ; Tao ; Zhang ; Fu-Hui ; Wang ; Jian ; Hou ; Hui-Xia ; Zhang 英文作者：Shuang Yu;Rui-Ling Jia;Tao Zhang;Fu-Hui Wang;Jian Hou;Hui-Xia Zhang;School of Materials Science and Engineering,Inner Mongolia University of Technology;State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute (LSMRI);School of Materials Science and Engineering,Northeast University; 英文关键词：Magnesium alloy;;Aging precipitates;;Corrosion;;Potential difference;;Transmission electron microscopy(TEM) 中文刊名：JSXY 英文刊名：金属学报(英文版) 机构：School of Materials Science and Engineering,Inner Mongolia University of Technology;State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute (LSMRI);School of Materials Science and Engineering,Northeast University; 出版日期：2019-04-15 出版单位：Acta Metallurgica Sinica(English Letters) 年：2019 期：v.32 基金：supported financially by the National Natural Science Foundation of China (No. 51531007);; the Natural Science Foundation of Inner Mongolia (No. 2016MS0538);; the Research Fund of State Key Laboratory for Marine Corrosion and Protection of Luoyang Ship Material Research Institute (LSMRI) (No. KF160408) 语种：英文; 页：JSXY201904003 页数：10 CN：04 ISSN：21-1361/TG 分类号：23-32

摘要

A large amount of directional and willow-like β' phase was precipitated in Mg-10 Gd-3 Y-0.4 Zr(GW103 K) alloy after solution treatment and subsequently aged treatment(T6). In order to explore the effect of the precipitates on the corrosion behavior of the GW103 K alloy, the alloy was subjected to solution treatment(T4) at 773 K for 4 h at first, subsequently aged at 498 K for 193 h(T6). The microstructure evolution of the GW103 K alloy after this treatment was investigated by scanning electron microscopy and transmission electron microscopy. The high-angle annular detector dark-field scanning transmission electron microscopy was used to observe the typical corrosion morphologies of the nanoscale precipitation phases(β') in the T6-treated alloy. The corrosion rate was measured by potentiodynamic polarization test. Combining with the potential measurement results by scanning Kelvin probe force microscopy, the effects of the skeleton-like Mg_(24)(Gd,Y)_5 andf precipitates on the corrosion behavior of GW103 K alloy were explored. The results showed that the corrosion rate of the GW103 K alloy in different conditions was ranked as: as-cast alloy> T4-treated alloy> T6-treated alloy,attributing to the fact that the relative potential differences of skeleton-like Mg_(24)(Gd,Y)_5 were lower than those of the matrix, therefore Mg24(Gd, Y)5 phase formed micro-galvanic coupling with the matrix and corrosion dissolution occurred.The nanoscale β' precipitates in T6-treated alloy can retard the cathodic process.
        A large amount of directional and willow-like β' phase was precipitated in Mg-10 Gd-3 Y-0.4 Zr(GW103 K) alloy after solution treatment and subsequently aged treatment(T6). In order to explore the effect of the precipitates on the corrosion behavior of the GW103 K alloy, the alloy was subjected to solution treatment(T4) at 773 K for 4 h at first, subsequently aged at 498 K for 193 h(T6). The microstructure evolution of the GW103 K alloy after this treatment was investigated by scanning electron microscopy and transmission electron microscopy. The high-angle annular detector dark-field scanning transmission electron microscopy was used to observe the typical corrosion morphologies of the nanoscale precipitation phases(β') in the T6-treated alloy. The corrosion rate was measured by potentiodynamic polarization test. Combining with the potential measurement results by scanning Kelvin probe force microscopy, the effects of the skeleton-like Mg_(24)(Gd,Y)_5 andf precipitates on the corrosion behavior of GW103 K alloy were explored. The results showed that the corrosion rate of the GW103 K alloy in different conditions was ranked as: as-cast alloy> T4-treated alloy> T6-treated alloy,attributing to the fact that the relative potential differences of skeleton-like Mg_(24)(Gd,Y)_5 were lower than those of the matrix, therefore Mg24(Gd, Y)5 phase formed micro-galvanic coupling with the matrix and corrosion dissolution occurred.The nanoscale β' precipitates in T6-treated alloy can retard the cathodic process.

引文

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