In this work Sn-Ag-Zn alloy of eutectic composition (Sn 3 7wt %Ag 0 9wt %Zn) was directionally solidified upward at a constant temperature gradient (G=4 33 K/mm) in a wide range of growth rates (V=3 38-22012 mu m/s) and a constant growth rate (V=11 52 mu m/s) with different temperature gradients (G=4 33-12 41 K/mm) using a Bridgman type directional solidification furnace The microstructure was observed to be a rod Ag(3)Sn structure in the matrix of beta-Sn from the directionally solidified Sn 3 7wt %Ag 0 9wt %Zn samples The values of eutectic spacing (A) were measured from transverse section of samples The dependency of eutectic spacing on the growth rate (V) and temperature gradient (G) were determined with linear regression analysis The dependency of lambda on the values of V and G were found to be lambda=10 42V(-0 53) and lambda=0 27G(-0 48) respectively The values of bulk growth were also determined to be lambda(2)V=86 39 mu m(3)/s by using the measured values of lambda and V The results obtained in present work were compared with the previous similar experimental results obtained for binary and ternary alloys (C) 2010 Published by Elsevier Inc
In this work, Sn–Ag–Zn alloy of eutectic composition (Sn-3.7wt.%Ag-0.9wt.%Zn) was
directionally solidified upward at a constant temperature gradient (G=4.33 K/mm) in a
wide range of growth rates (V=3.38–220.12 µm/s) and a constant growth rate (V=11.52 µm/s)
with different temperature gradients (G=4.33–12.41 K/mm) using a Bridgman type
directional solidification furnace. The microstructure was observed to be a rod Ag3Sn
structure in the matrix of ß–Sn from the directionally solidified Sn-3.7wt.%Ag-0.9wt.%Zn
samples. The values of eutectic spacing (?) were measured from transverse section of
samples. The dependency of eutectic spacing on the growth rate (V) and temperature
gradient (G) were determined with linear regression analysis. The dependency of ? on the
values of V and G were found to be ?=10.42V- 0.53 and ?=0.27G- 0.48, respectively. The values
of bulk growth were also determined to be ?2V=86.39 µm3/s by using the measured values of
? and V. The results obtained in present work were compared with the previous similar
experimental results obtained for binary and ternary alloys.
