Microstructure and corrosion behavior of as-extruded Mg-xLi-3Al-2Zn-0.2Zr alloys (x = 5, 8, 11 wt.%)

Sun Yuehua; Wang Richu; Peng Chaoqun; Cai Zhiyong

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Microstructure and corrosion behavior of as-extruded Mg-xLi-3Al-2Zn-0.2Zr alloys (x = 5, 8, 11 wt.%)

机译：挤出Mg-XLI-3AL-2ZN-0.2ZR合金的组织和腐蚀行为（x = 5,8,11重量％）

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摘要

The microstructure and corrosion behavior of as-extruded Mg-xLi-3Al-2Zn-0.2Zr alloys (x = 5, 8, 11 wt.%) were investigated. Intergranular corrosion is observed in alpha-Mg phase, while pitting corrosion takes place in beta-Li phase. In dual-phase LAZ832-0.2Zr alloy, micro-galvanic corrosion occurs at the alpha-Mg/beta-Li phase interface. As-extruded LAZ832-0.2Zr alloy exhibits the best corrosion resistance due to that a-Mg phase contains fewer twins, finer and sparser AlLi phase at grain boundaries, and narrower Al depleted zones compared with as-extruded LAZ532-0.2Zr alloy, and beta-Li phase exhibits smaller grain size, lower dislocation density, and fewer AlLi particles compared with as-extruded LAZ1132-0.2Zr alloy.

机译：研究了用挤出的Mg-XLI-3AL-2ZN-0.2ZR合金（X = 5,8,11重量％）的微观结构和腐蚀行为。在α-Mg相中观察到晶间腐蚀，而在β-Li相中发生点蚀腐蚀。在双相LAZ832-0.2ZR合金中，在α-Mg / Beta-Li相界面处发生微电抗腐蚀。由于挤出的晶界，颗粒界限下的双胞胎，较好和稀释的区域，与挤出的Laz532-0.2ZR合金相比，挤出的Laz832-0.2Zr合金具有较少的双胞胎，更细，稀释的区域，以及较窄的Al耗尽的区域。与挤出的Laz1132-0.2ZR合金相比，β-Li相表现出较小的粒度，低位脱位密度和较少的Alli颗粒。

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来源
《Corrosion science》 |2020年第5期|108487.1-108487.15|共15页
作者
Sun Yuehua; Wang Richu; Peng Chaoqun; Cai Zhiyong;
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Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China;

Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China;

Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China;

Cent South Univ Sch Mat Sci & Engn Changsha 410083 Peoples R China;

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正文语种 eng
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关键词
Magnesium; EIS; XPS; Intergranular corrosion; Pitting corrosion;

机译：镁;EIS;XPS;晶间腐蚀;点燃腐蚀;

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Microstructure and corrosion behavior of as-extruded Mg-xLi-3Al-2Zn-0.2Zr alloys (x = 5, 8, 11 wt.%)

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