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《Materials Science and Technology》 2017-06
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Influence of homogenization on microstructure and corrosion resistance of EK31 magnesium alloy

ZHANG Tao;WANG Zhongjun;WANG Dongxiao;CHU Xu;WANG Hongbin;ZHOU Le;School of Materials and Metallurgy,University of Science and Technology Liaoning;  
In order to study the effect of homogenization heat treatment on the microstructure and corrosion resistance of EK31 magnesium alloy containing rare earth element Er,the microstructures of as-cast EK31 magnesium alloy after homogenization at 300 ℃,400 ℃ and 500 ℃,the holding time from 0.5 h to 8 h were observed and the electrochemical corrosion behavior of 3. 5 wt.% Na Cl aqueous solutions were studied by optical microscopy( OM), scanning electron microscopy( SEM), X-ray diffraction( XRD) and electrochemical workstation. The results show that the as-cast EK31 alloy was mainly composed of α-Mg grains and β-Zr core phases. After homogenization at 300 ℃ ×6 h,the β-Zr core phase was dissolved and diffused in the alloy matrix. The corrosion rate of the solution was 4.3×10~(-3 mg/( cm~2·h) after being immersed in 3.5%Na Cl solution for 96 h. When the temperature was 400 ℃ and 500 ℃ abd the holding time was more than 6 h,the rare earth element Er was enriched near the grain boundary and generated a large amount of Mg_(24)Er_5 phase,leading to an increase of the corrosion rate of the alloy to 1.1×10~(-2) mg/( cm~2·h). However,compared with other magnesium alloys,it has excellent corrosion resistance. The reason is that the hindrance of the rare earth element Er and Mg_(24)Er_5 phase in the vicinity of the grain boundary.
【Fund】: 国家自然科学基金资助项目(51374128;51404137)
【CateGory Index】: TG146.22
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