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Unidirectional solidification of Zn-rich Zn-Cu hypoperitectic alloy

Published online by Cambridge University Press:  31 January 2011

Hasan Kaya ,
Sevda Engin ,
U. Böyük ,
Emin Çadırlı  and
Necmettin Maraşlı
Hasan Kaya*
Affiliation:
Department of Science Education, Education Faculty, Erciyes University, Kayseri, Turkey
Sevda Engin
Affiliation:
Institute of Science and Technology, Department of Physics, Erciyes University, Kayseri, Turkey
U. Böyük
Affiliation:
Department of Science Education, Education Faculty, Erciyes University, Kayseri, Turkey
Emin Çadırlı
Affiliation:
Department of Physics, Faculty Arts and Sciences, Niğde University, Niğde, Turkey
Necmettin Maraşlı
Affiliation:
Department of Physics, Faculty Arts and Sciences, Erciyes University, Kayseri, Turkey
*
a) Address all correspondence to this author. e-mail: hasankaya@erciyes.edu.tr
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Abstract

Zn-0.7 wt.% Cu-hypoperitectic alloy was prepared in a graphite crucible under a vacuum atmosphere. Unidirectional solidification of the Zn-0.7 wt.% Cu-hypoperitectic alloy was carried out by using a Bridgman-type directional solidification apparatus under two different conditions: (i) with different temperature gradients (G = 3.85–9.95 K/mm) at a constant growth rate (41.63 μm/s) and (ii) with different growth rate ranges (G = 8.33–435.67 μm/s) at a constant temperature gradient (3.85 K/mm). The microstructures of the directionally solidified Zn-0.7 wt.% Cu-hypoperitectic samples were observed to be a cellular structure. From both transverse and longitudinal sections of the samples, cellular spacing (λ) and cell-tip radius (R) were measured. The effects of solidification-processing parameters (G and V) on the microstructure parameters (λ and R) were obtained by using a linear regression analysis. The present experimental results were also compared with the current theoretical and numerical models and similar previous experimental results.

Keywords

AlloyCellular (material form)Microstructure
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3422 - 3431
Copyright
Copyright © Materials Research Society 2009

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