Effect of Intermetallic Phases on Corrosion Initiation of AZ91 Alloy With Rare Earth Y Addition
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第5期
论文作者：Li-na Zhang Ruiling Jia Dan Li Wei Zhang Feng Guo
文章页码：504 - 511
摘 要：The effect of the rare earth（RE） element Y on the microstructure of AZ91 Mg alloy is investigated.A detailed description of the procedure of identifying the intermetallic phases containing Y in the AZ91 Mg alloy with 0.9 wt%Y addition is presented.The results shows that there are two different kinds of RE phases in scanning electron microscopy（SEM） images.Energy dispersive spectrum（EDS） analysis shows that one is rich in Y element and the other is rich in Mn element.According to the element mapping of electron probe microanalysis（EPMA）.the element Al can be found not only in the β-Mg17Al12 phase but also in these two RE phases.X-ray diffraction（XRD） and transmission electron microscopy（TEM） results further confirm one of the two RE phases is AI2Y;the phase of Al10Mn2Y has just been determined by transmission electron microscopy（TEM） instead of XRD probably because it is scarce.The shapes of these two RE intermetallic phases are pretty similar.The 3D digital microscopy is employed to observe in-situ the effect of the(5 phase and the above two RE intermetallic phases on the corrosion initiation of the alloys.The results show that the corrosion attack of AZ91 Mg alloy without Y addition starts around the eutectic phase β-Mg17Al12.With the addition of 0.9 wt%Y,the two kinds of Y-rich intermetallic phases act as cathodic effect and a phase in the adjacent of them was activated and cathodic effect of the β-Mg17Al12phase was inhibited.
Li-na Zhang1，Ruiling Jia1,2，Dan Li1，Wei Zhang2，Feng Guo1
1. School of Materials Science and Engineering,Inner Mongolia University of Technology2. State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences
摘 要：The effect of the rare earth（RE） element Y on the microstructure of AZ91 Mg alloy is investigated.A detailed description of the procedure of identifying the intermetallic phases containing Y in the AZ91 Mg alloy with 0.9 wt%Y addition is presented.The results shows that there are two different kinds of RE phases in scanning electron microscopy（SEM） images.Energy dispersive spectrum（EDS） analysis shows that one is rich in Y element and the other is rich in Mn element.According to the element mapping of electron probe microanalysis（EPMA）.the element Al can be found not only in the β-Mg17Al12 phase but also in these two RE phases.X-ray diffraction（XRD） and transmission electron microscopy（TEM） results further confirm one of the two RE phases is AI2Y;the phase of Al10Mn2Y has just been determined by transmission electron microscopy（TEM） instead of XRD probably because it is scarce.The shapes of these two RE intermetallic phases are pretty similar.The 3D digital microscopy is employed to observe in-situ the effect of the(5 phase and the above two RE intermetallic phases on the corrosion initiation of the alloys.The results show that the corrosion attack of AZ91 Mg alloy without Y addition starts around the eutectic phase β-Mg17Al12.With the addition of 0.9 wt%Y,the two kinds of Y-rich intermetallic phases act as cathodic effect and a phase in the adjacent of them was activated and cathodic effect of the β-Mg17Al12phase was inhibited.
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