Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Dendrite Tip Shapes of Pivalic Acid-Ethanol and Succinonitrile-Salol Systems

Pivalic Acid-Ethanol 및 Succinonitrile-Salol 계에서의 수지상정 선단의 형상

  • Suk, Myung-Jin (Department of Materials and Metallurgical Engineering, Kangwon National University) ;
  • Park, Young-Min (Department of Materials and Metallurgical Engineering, Kangwon National University) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Chang, Si-Young (Department of Materials Engineering, Korea Aerospace University)
  • 석명진 (강원대학교 재료금속공학과) ;
  • 박영민 (강원대학교 재료금속공학과) ;
  • 오승탁 (서울과학기술대학교 신소재공학과) ;
  • 장시영 (한국항공대학교 항공재료공학과)
  • Received : 2011.02.10
  • Published : 2011.07.25
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Abstract

The shape of a dendrite tip has long been approximated by a paraboloid of revolution, but many attempts have been made as well to more accurately match the dendrite tip profile using other mathematical functions: power function, 4th order polynomial, and hyperbolic function. In the present work, dendrite tip shapes were matched by parabolic function. The differences between the dendrite tip shapes of pivalic acid(PVA)-ethanol(Eth) and succinonitrile(SCN)-salol systems, characterized by anisotropic and isotropic solid-liquid interfacial properties, respectively, were quantitatively treated using shape parameters. The PVA-Eth system showed a slightly higher Z/R value than the SCN-salol system, their Z/R values lying in the range 2-4. (Z is the distance from the tip beyond which the parabolic fit starts to deviate from the profile, and R the tip radius.) ${\lambda}_P$ is the distance from the tip beyond which side branching starts to appear, and is larger in the PVA-Eth system than the SCNsalol system. ${\lambda}_P$ is different for both sides of the 2-dimensional dendrite profile. The difference of ${\lambda}_P$ between both sides of the dendrite is larger for PVA-Eth system than for SCN-salol, implying that the dendrite of PVA-Eth is less symmetric than that of SCN-salol.

Keywords

Acknowledgement

Supported by : 한국연구재단

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