Composition of Solidified Binary Alloy from a Simple Solidification Model

摘要

An expression is obtained for the composition as a function of position of a binary alloy solidified from its melt. The simple model has uniform density, no material diffusion in the solid, and uniform temperature and concentration in the liquid. Provided that these assumptions hold, and no remelt occurs, the solid composition is independent of the mode of cooling. Only conservation of mass and the two component solid/liquid phase diagram are used. In the concentration profile obtained, only one component is present in the last increment of alloy solidified. The origin of this characteristics is discussed. An application of the analysis is made to a copper/nickel system. (ERA citation 06:001074)