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定向凝固多孔镁锌合金的制备及气孔结构研究
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1.昆明理工大学材料学院;2.清华大学材料学院

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Fabrication and pore structure of directionally solidified porous Mg-Zn alloy
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1.Faculty of Materials Science and Engineering,Kunming University of Science and Technology;2.School of Materials Science and Engineering, Tsinghua University

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    摘要:

    采用Bridgman型定向凝固法成功制备出藕状多孔Mg-Zn合金。研究了不同锌含量和氢气压力对气孔形貌的影响。通过理论计算对Mg-1Zn的孔隙率进行了预测。结果表明,锌元素的加入会对孔结构产生重大影响。随着Zn含量从0增加到2%,平均孔径增加。随着氢气压力从0.1MPa增加到0.6MPa,Mg-1Zn合金的孔隙率明显降低。基于氢气在多组分熔融金属中溶解度的计算模型, Mg-1Zn合金铸锭凝固高度为20mm的孔隙率的计算结果与模型的结果比较吻合。通过观察组织,随着Zn含量的增加,凝固组织由柱状晶转变为等轴晶。此外,研究了在不同凝固阶段的孔形成过程,可为定向凝固多孔Mg-Zn合金在生物医用材料中的应用提供理论依据。

    Abstract:

    Lotus-type porous Mg-Zn alloys were fabricated successfully by Bridgman-type directional solidification method. The pore structure and porosity of Mg alloys at different Zn content and hydrogen pressure were studied. The porosity of Mg-1wt.% Zn was predicted through the theoretical calculation. The results show that pore structure can be influenced by the addition of Zn element. As the content of Zn increases from 0 to 2 wt.%, average pore diameter increases. The porosity of Mg-1wt.%Zn alloy clearly decreases with the increasing of the hydrogen pressure from 0.1MPa to 0.6MPa. Based on a model for estimating the solubility of hydrogen in multi-component molten metals, the calculated results of porosity at the solidification stage (20mm height) with a changed hydrogen pressure in Mg-1wt.%Zn alloy, are in good agreement with the experimental results. Through observations on the microstructures, the column grains of Mg-Zn alloy are changed into equiaxed grains as the content of Zn increases. Also, the formation of pore at different solidification stages was studied, which can supply theoretical basis for the fabrication of Gasar Mg-Zn alloy in the biological applications.

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肖心雄,刘源,金青林,周灿旭,张华伟,李言祥,李再久.定向凝固多孔镁锌合金的制备及气孔结构研究[J].稀有金属材料与工程,2021,50(2):497~503.[xiao xinxiong, liu yuan, jin qinglin, zhou canxu, zhang huawei, li yanxiang, li zaijiu. Fabrication and pore structure of directionally solidified porous Mg-Zn alloy[J]. Rare Metal Materials and Engineering,2021,50(2):497~503.]
DOI:10.12442/j. issn.1002-185X.20200069

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  • 收稿日期:2020-02-07
  • 最后修改日期:2020-03-04
  • 录用日期:2020-03-05
  • 在线发布日期: 2021-03-09
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