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Chinese Science Bulletin

, Volume 49, Issue 3, pp 220–224 | Cite as

Rapid monotectic solidification during free fall in a drop tube

  • Haipeng Wang
  • Chongde Cao
  • Bingbo Wei
Articles

Abstract

Droplets of Ni-31.4%Pb monotectic alloy with different sizes are rapidly solidified during free fall in a drop tube. The theoretical calculations indicate that the undercooling was achieved before solidification exponentially depends on droplet diameter. The maximum undercooling of 241 K (0.15Tm) is obtained in the experiments. With the increase of undercooling, the volume fraction of monotectic cells increases, and the L2(Pb) grains are refined. Calculations of the nucleation rates of L2(Pb) and α-Ni phases indicate that L2(Pb) phase acts as the leading nucleation phase during the monotectic transformation.

Keywords

monotectic solidification high undercooling containerless processing low gravity 

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Copyright information

© Science in China Press 2004

Authors and Affiliations

  • Haipeng Wang
    • 1
  • Chongde Cao
    • 1
  • Bingbo Wei
    • 1
  1. 1.Department of Applied PhysicsNorthwestern Polytechnical UniversityXi’anChina

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