Chin. Phys. Lett.  2004, Vol. 21 Issue (8): 1590-1592    DOI:
Original Articles |
Ternary Eutectic Growth in a Highly Undercooled Liquid Alloy
RUAN Ying;WANG Nan;CAO Chong-De;WEI Bing-Bo
Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072
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RUAN Ying, WANG Nan, CAO Chong-De et al  2004 Chin. Phys. Lett. 21 1590-1592
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Abstract The crystal nucleation and growth mechanism during the formation of Ag42.4Cu21.6Sb36 ternary eutectic are investigated under substantial undercooling conditions. The x-ray diffraction analysis shows that the solidified eutectic phases are not involved (Ag) within a wide undercooling range of 6-114K. This indicates that under high undercooling condition, the phase constitution of Ag-Cu-Sb eutectic is different from that in the equilibrium phase diagram. With the increase of undercooling, the crystalline morphology of Ag42.4Cux21.6Sb36 alloy transforms from the mixed structure of primary θ(Cu2Sb), two pseudobinary eutectics and (ε+θ+Sb) ternary eutectic into a unique (ε+θ+Sb) ternary eutectic. The calculated results indicate that θ(Cu2Sb) is the leading nucleating phase among the three eutectic phases. In addition, the growth morphology of primary ε(Ag3Sb) compound in Ag60Cu6Sb34 alloy exhibits the characteristics of solid solution and its orthorhombic dendrite grows along the <111> directions.

Keywords: 61.25.Mv      68.55.Ac      68.55.Jk     
Published: 01 August 2004
PACS:  61.25.Mv (Liquid metals and alloys)  
  68.55.Ac  
  68.55.Jk  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2004/V21/I8/01590
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