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Conical samples of a Mg–3.8%Zn–2.2%Ca alloy undergoing the columnar to equiaxed transition, induced by the addition of 1.5%Zr, have been examined. The zirconium contents in the equiaxed grains just ahead of the columnar front were found to generally vary between 0.2% and 0.3%. Further assessment confirmed that, as the first step towards optimum grain refinement, a zirconium content of 0.22% was necessary...
Solidification characteristics of the remnant liquid in a sheared semisolid slurry of Sn-15 wt.%Pb alloy is reported. A high shear rate and shear duration combination may promote fine spherical morphology of the secondary solidification product. Resting prior to solidification following shearing appears to wear off the effects of shearing.
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