Response of Crystal Growth Experiments to Time-Dependent Residual Accelerations

摘要

Real-time Seebeck voltage variations across a Sn-Bi melt during directional so-lidification in MEPHISTO on USMP-11 show a distinct variation which can be correlated with thruster firings. The Seebeck voltage measurement is related to the response of the instantaneous average melt composition at the melt-solid interface. This allows a direct comparison of numerical simulations with the Seebeck signals obtained on USMP-1. The effects of such, accelerations on com-position for a directionally solidifying Sn-Bi alloy have been simulated numeri-cally. USMP-1 acceleration data was used to assist in our choice of accelerationmagnitude and orientation.