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Chinese Science Bulletin

, Volume 49, Issue 17, pp 1801–1805 | Cite as

Rapid solidification mechanism of Ag60Sb34Cu6 ternary alloy in drop tube

  • Ying Ruan
  • Nan Wang
  • Chongde Cao
  • Bingbo Wei
Articles

Abstract

Droplets of Ag60Sb34Cu6 ternary alloy within the diameter range of 60–800 μm were rapidly solidified by means of drop tube containerless processing, and the solidification mechanism is analyzed. With a decrease in droplet size, the cooling rate increases from 57 to 5.8×104 K/s. The maximum undercooling is determined to be 180 K (0.23T L) and the microstructure of primary ε(Ag3Sb) dendrite refines drastically until homogenous equiaxed dendrite forms. Experimental results indicate that (ε+Ag) pseudobinary eutectic cannot form under high undercooling conditions and the solubility of Ag in primary ε phase increases as undercooling increases. Based on thermal analysis and crystal growth morphology, it is found that this alloy is solidified in two ways corresponding to different undercooling levels.

Keywords

ternary eutectic growth high undercooling rapid solidification crystal nucleation 

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Copyright information

© Science in China Press 2004

Authors and Affiliations

  • Ying Ruan
    • 1
  • Nan Wang
    • 1
  • Chongde Cao
    • 1
  • Bingbo Wei
    • 1
  1. 1.Laboratory of Materials Science in Space, Department of Applied PhysicsNorthwestern Polytechnical UniversityXi’anChina

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