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Journal of Central South University of Technology

, Volume 13, Issue 6, pp 613–617 | Cite as

Influence of electromagnetic stirring on microstructure of AZ91-0.8%Ce magnesium alloy

  • Liu Sheng-fa  (刘生发)Email author
  • Kang Liu-gen  (康柳根)
  • Han Hui  (韩辉)
  • Liu Lin-yan  (刘林艳)
  • Zou Xiao-qiang  (邹晓强)
  • Guo Hong-he  (郭洪河)
Article

Abstract

Effect of electromagnetic stirring on microstructure of AZ91-0.8%Ce magnesium alloy was investigated. The results show that electromagnetic stirring causes a change of morphology of α-Mg phase from coarse dendrites to fine rosette-like or spherical shape. Grain size is significantly refined within the range of input voltage 75–125 V, moreover, the optimum input voltage corresponded to the minimum value (64 μ m) of grain size is 125 V. Compared to the non-stirred condition, the amount of β-Mg17Al12 precipitate under the stirred condition obviously increases. The grain refinement of AZ91-0.8%Ce alloy is mainly attributed to multiplication of existing grains in the melt caused by forced fluid flow under electromagnetic stirring condition. Addition of 0.8% Ce results in the formation of ‘necking’ at secondary dendrite arm roots of α-Mg crystals, and consequently, it is helpful to increase the number of heterogeneous nucleation.

Key words

AZ91 magnesium alloy electromagnetic stirring cerium microstructure refinement 

CLC number

TG146.2 

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Copyright information

© Published by: Central South University Press, Sole distributor outside Mainland China: Springer 2006

Authors and Affiliations

  • Liu Sheng-fa  (刘生发)
    • 1
    Email author
  • Kang Liu-gen  (康柳根)
    • 1
  • Han Hui  (韩辉)
    • 1
  • Liu Lin-yan  (刘林艳)
    • 1
  • Zou Xiao-qiang  (邹晓强)
    • 1
  • Guo Hong-he  (郭洪河)
    • 1
  1. 1.School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina

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