|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals
||In-situ Synchrotron X-ray Imaging of Inter-dendritic Fluid Flow Using a Model Al-Pb Alloy
||Enzo Liotti, Andrew Lui, André Phillion, Patrick S. Grant
|On-Site Speaker (Planned)
Inter-dendritic fluid flow is a key factor controlling the formation of solidification defects such as macro-segregation, hot tearing and shrinkage porosity. Castings are designed to facilitate the fluid flow and feeding of residual liquid into solidifying and shrinking regions to minimize these defects. However, these designs are optimized using empirical rules or numerical models that rely on experimentally fitted parameters because little is known quantitatively about the nature of fluid flow within the mushy zone. We present preliminary results of direct measurements of inter-dendritic flow using in-situ X-ray radiography of a model Al-Pb alloy. Foil samples with compositions that formed tiny liquid Pb droplets within inter-dendritic channels were directionally solidified and the resulting videos analysed to produce time-resolved vectors maps of the fluid flow under different conditions. Measurements and arising insights are compared with those from simulations, and future directions for this technique are discussed.
||Planned: Supplemental Proceedings volume