INFLUENCE OF GROWTH RATE ON MICROSTRUCTURE AND MICROINDENTATION HARDNESS OF DIRECTIONALLY SOLIDIFIED TIN–CADMIUM EUTECTIC ALLOY

E. Çadirli (), H. Kaya and M. Gündüz
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E. Çadirli: Faculty of Arts and Sciences, Department of Physics, Niğde University, Niğde, Turkey
H. Kaya: Education Faculty, Department of Science Education, Erciyes University, Kayseri, Turkey
M. Gündüz: Faculty of Arts and Sciences, Department of Physics, Erciyes University, Kayseri, Turkey

Surface Review and Letters (SRL), 2009, vol. 16, issue 02, 191-201

Abstract: Sn–Cdeutectic melt was first obtained in a hot filling furnace and then directionally solidified upward with different growth rate ranges (8.1–165 μm/s) at a constant temperature gradientG(4.35 K/mm) in the Bridgman-type directional solidification furnace. The lamellar spacings (λ) were measured from both transverse and longitudinal sections of the samples. The influence of the growth rate (V) on lamellar spacings (λ) and undercoolings (Δ T) was analyzed.λ2V,ΔTλandΔTV-0.5values were determined by usingλ,ΔTandVvalues. Microindentation hardness (HV) was measured from both transverse and longitudinal sections of the specimens.HVvalues increase with the increasing values ofVbut decrease with increasing λ values.λ-V,λ - ΔTandλ2Vresults have been compared with the Jackson–Hunt eutectic model and similar experimental results,HV- VandHV- λresults were also compared with the previous work.

Keywords: Directional solidification; eutectic microstructure; microindentation hardness (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09012494

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