|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Frontiers in Solidification: An MPMD Symposium in Honor of Michel Rappaz
||QQ-4: In-situ Synchrotron X-ray Radiography Measurement of the Diffusion Zones during Equiaxed Solidification of Al-Cu Alloys
||Enzo Liotti, Andrew Lui, Sundaram Kumar, David StJohn, Patrick S. Grant
|On-Site Speaker (Planned)
Although it is well known that the distribution of solute ahead of the solid-liquid front is a critical factor controlling the growth of both columnar and equiaxed dendrites, and therefore the final microstructure of any cast component, there are few experimental approaches that yield quantitative information on the solute distribution in the liquid. Synchrotron-based radiography allows high temporal resolution of dynamic events such as solidification, and sequences of images of grain morphology and solute patterns in the liquid can now be readily obtained. This paper presents a method of measuring solute profiles in the liquid during equiaxed solidification of Al-Cu alloys allowing tracking of the evolution of the diffusion fields around evolving grains. Quantitative measurements are described and the effect of gravity and convective flow on the dynamic evolution of the solute profiles is discussed. Finally, some ideas are introduced on the dynamic measurement of solute profiles in multi-component alloys.