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刘宝胜,王亚宁,张跃忠,侯利锋,卫英慧.Mn添加对挤压态Mg-Zn-Y-Nd合金微观组织和腐蚀行为的影响[J].稀有金属材料与工程(英文),2021,50(1):49~55.[刘宝胜,wangyaning,zhangyuezhong,houlifeng and weiyinghui.Microstructure and corrosion behavior of extruded Mg-Zn-Y-Nd alloy respect to Mn addition[J].Rare Metal Materials and Engineering,2021,50(1):49~55.]
Microstructure and corrosion behavior of extruded Mg-Zn-Y-Nd alloy respect to Mn addition
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Received:November 28, 2019  
DOI:
Key words: Mg-Zn-Y-Nd alloy  Mn addition  microstructure  dynamic recrystallizaiton (DRX)  corrosion resistance
Foundation item:山西省高等学校科技成果转化项目(TSTAP),山西省新兴产业领军人才项目,中央引导地方科技发展专项资金项目(YDZX20181400002967),山西省研究生优秀创新项目(2019Y483)。
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刘宝胜,wangyaning,zhangyuezhong,houlifeng and weiyinghui  
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Abstract:
      The effect of Mn addition on the microstructure and corrosion behavior of extruded Mg-Zn-Y-Nd alloy immersed in 3.5 wt.% NaCl solution were studied by optical microscope, scanning electron microscope equipped with energy dispersive spectroscope, X-ray diffraction, immersion, and electrochemical measurements. Results suggest that the Mn addition in the studied Mg-Zn-Y-Nd alloy can induce Mg3Y2Zn3 (I-phase) precipitation which may inhibit dynamic recrystallizaiton (DRX) grain coarsening during hot extrusion. Meanwhile, its corrosion resistance was improved owing to the addition of Mn. The corrosion rates of free and 1.0 wt.% Mn containing Mg-5.6Zn-1Y-0.4Nd alloys were 18.78 and 9.89 mm·y?1, respectively. The improvement of corrosion resistance is mainly due to an enhanced protectiveness of the corrosion product layer.