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Effect of flow, heat transfer and magnetic energy on the grain refinement of 7A04 alloy under electromagnetic pulse

  • Qingwei Bai , Yonglin Ma , Shuqing Xing , Xinyu Bao , Yanfei Feng , Wenxia Yu and Xiaolan Kang
Published/Copyright: November 25, 2017
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 108 Issue 12

Abstract

In this paper, a transient numerical simulation method was used to analyze the direct chill casting process of 7A04 alloy under electromagnetic pulse treatment. The distribution and evolution of the electromagnetic force, fluid and thermal fields were studied to determine their effect on the solidification characteristics of alloy ingots. A modified nucleation theory for the refinement of grain size was presented considering the effect of electromagnetic energy on the critical Gibbs free energy ΔG* of the unity, which was verified by the corresponding experiments. The results showed that the swirl rings of the axial section in the melt were restrained and a lower temperature gradient was formed in the radial section when the magnetic flux intensity was increased. Under these conditions for nucleation, the grain refinement could be explained by the electromagnetic pulse energy that reduced the energy barrier and improved the nucleation rate, either heterogeneous nucleation or homogeneous nucleation.

Keywords: Grain refinement; Finite element method; Electromagnetic energy; Heterogeneous nucleation; Energy barrier
*Correspondence address, Prof. Yonglin Ma, School of Material and Metallurgy, Inner Mongolia University of Science & Technology, No. 7 Arding Street, Baotou, ZIP: 014010, P. R. China, Tel.: +8615947629690, E-mail:

First author's contact details, Qingwei Bai, Ph. D. candidate, E-mail:

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Received: 2017-03-24
Accepted: 2017-08-08
Published Online: 2017-11-25
Published in Print: 2017-12-08

© 2017, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111562
Keywords for this article
Grain refinement; Finite element method; Electromagnetic energy; Heterogeneous nucleation; Energy barrier

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. First principles, thermal stability and thermodynamic assessment of the binary Ni–W system
  5. Experimental evaluation of forming limit diagram and mechanical properties of nano/ultra-fine grained aluminum strips fabricated by accumulative roll bonding
  6. FSW of bimodal reinforced Al-based composites produced via spark plasma sintering
  7. Modelling analysis and experiments of polycrystalline silicon directional solidification in an annular heating field
  8. Effect of flow, heat transfer and magnetic energy on the grain refinement of 7A04 alloy under electromagnetic pulse
  9. A study on effects of a new two-step strain induced melt activation process on characteristics of Al 7075 alloy
  10. Synthesis and characterization of mechanically alloyed cerium oxide reinforced Al-4.5Mg alloy composite
  11. Densification rate and interfacial adhesion of bilayer cemented tungsten carbide and steel
  12. Short Communications
  13. Cavitation erosion of 17-4 PH stainless steels following sub-zero treatment
  14. Investigation on microstructure and thermal properties of in-situ synthesized Cu–ZrO2 nanocomposites
  15. DGM News
  16. DGM News
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