SOLIDIFICATION CHARACTERISTICS AND MICROSTRUCTURAL EVOLUTION OFZn-1.26wt.%AlALLOY

Mevlüt Şahi̇n and Emi̇n Çadirli ()
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Mevlüt Şahi̇n: Department of Physics, Faculty of Arts and Sciences, Niğde University, Niğde, Turkey
Emi̇n Çadirli: Department of Physics, Faculty of Arts and Sciences, Niğde University, Niğde, Turkey

Surface Review and Letters (SRL), 2011, vol. 18, issue 06, 281-288

Abstract: Zn–1.26wt.%Alalloy was directionally solidified upward with a constant growth rate(V = 16.6 μm/s)in a wide range of temperature gradients(G = 1.94–5.15 K/mm)and with a constant temperature gradient(G = 5.15 K/mm)in a wide range of growth rates(V = 8.3–500 μm/s)with a Bridgman-type directional solidification furnace. Microstructure parameters, the primary dendrite arm spacing (λ1), secondary dendrite arm spacing (λ2) and dendrite tip radius(R), were measured and expressed as functions ofGandVby using a linear regression analysis method. It was found that the values of λ1, λ2andRdecrease with increasing values ofVandG. The experimental results were compared with the main predictive theoretical and experimental works for dendritic spacings.

Keywords: Metals and alloys; solidification; microstructure (search for similar items in EconPapers)
Date: 2011
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DOI: 10.1142/S0218625X1101476X

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