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A simple analytical model for predicting shrinkage-induced macrosegregation during direct-chill casting is suggested. The model links the macrosegregation to the local slope of the coherency isotherm, the thickness of the mushy zone, and the solidification path of an alloy. The derived expression is applied to a direct-chill casting of an Al–Cu alloy and shows good semi-quantitative agreement with...
This paper reports in situ investigation of porosity formation and its influence upon the subsequent microstructure development during solidification of an Al–6wt.% Sn alloy using X-ray imagining and directional solidification and X-ray computed tomography techniques. The growing porosity induces abnormal macrosegregation of Sn above the pores, which is attributed to mass transportation caused by...
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