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李其智,余 晖,王志峰,王岳宸,孟帅举,肖海涛,赵维民.快速凝固对微量Y添加Mg-4Al-2Zn合金显微组织,压缩性能及腐蚀行为的研究[J].稀有金属材料与工程(英文),2019,47(3):1001~1007.[Li Qizhi,Yu Hui,Wang Zhifeng,Wang Yuechen,Meng Shuaiju,Xiao Haitao and Zhao Weimin.Effects of rapid solidification on the microstructural evolution, mechanical properties and corrosion behavior of Mg-4Al-2Zn alloys with various Y addition[J].Rare Metal Materials and Engineering,2019,47(3):1001~1007.]
Effects of rapid solidification on the microstructural evolution, mechanical properties and corrosion behavior of Mg-4Al-2Zn alloys with various Y addition
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Received:August 25, 2017  Revised:October 18, 2017
DOI:
Key words: Magnesium alloy  rapid solidification  microstructure  mechanical properties  corrosion behavior
Foundation item:国家自然科学基金(51701060),河北省自然科学基金优秀青年科学基金(E2016202130),河北省教育厅高等学校科学研究计划项目(QN2015035),河北工业大学优秀青年科技创新基金(2015002),国家外专局高端外国专家项目(GDW20171300102)
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Li Qizhi,Yu Hui,Wang Zhifeng,Wang Yuechen,Meng Shuaiju,Xiao Haitao and Zhao Weimin  
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Abstract:
      In present work, two kinds of Mg-4Al-2Zn alloy (AZ42) with minor addition of Y elements (0.5, 1.0 wt.%) were succesfully fabricated by gravity casting and rapid solidifaication process, respectively. In addition, microstructure, mechanical properties and corrosion behavior of AZ42 alloys with Y addition were systemetically investigated. The results show that rapid solidification technique can significantly refine the microstructure of AZ42 alloys containing Y and improve related mechanical properties and corrosion resistance compared with the traditional casting counterparts. The microstructure of Y-bearing AZ42 alloy is mainly composed of α-Mg matrix, β-Mg17Al12 phase and Al2Y phase. Moreover, the addition of Y in AZ42 alloy resulted in grain refinmenent and enhancement of both mechancial and corroison properties, which maybe attributed to fine grain size and distribution modification of β-phase. And the optimum amount of Y element in AZ42 alloy is determined to be 0.5 wt.%.