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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
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河北工业大学 材料科学与工程学院

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TG146.2

基金项目:

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)


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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School of Materials Science and Engineering, Hebei University of Technology

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    摘要:

    本文通过常规铸造与快速凝固法成功制得两类Mg-4Al-2Zn-xY(AZ42,x: 0.5, 1.0 wt.%)镁合金,并系统研究了快速凝固对微量Y添加后AZ42合金组织和性能的影响。研究结果表明,快速凝固工艺较传统铸造相比可显著细化AZ42合金的微观组织并提高合金的力学性能和耐腐蚀特性。AZ42合金加入Y元素后组织主要由α-Mg基体、β-Mg17Al12相和Al2Y相构成。此外,微量Y添加可显著细化AZ42合金的组织并改善网状β相分布,从而提高合金的力学与耐腐蚀性能;其中,当Y添加量为0.5%时可获得最佳综合性能。

    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.%.

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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,2019,47(3):1001~1007.[Li Qizhi, Yu Hui, Wang Zhifeng, Wang Yuechen, Meng Shuaiju, Xiao Haitao, 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.]
DOI:10.12442/j. issn.1002-185X.20170758

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  • 收稿日期:2017-08-25
  • 最后修改日期:2017-10-18
  • 录用日期:2017-11-09
  • 在线发布日期: 2019-04-10
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