Liquid Immiscibility of Fe-Ag-Cu-B System

Abstract

The equilibration experiments of the Fe-Ag-Cu-B system were performed at 1873 K and 1523 K, and the distribution ratio of Cu between Fe-B and Ag phases was measured. As the B content of the Fe-B phase increases, the distribution ratio of Cu, L_Cu, increases. L_Cu becomes constant in the region of [mass%B](_{in Fe})>3.96 at 1873 K. The value of LCu is determined to be approximately 6 at [mass%B](_{in Fe})=3 in the region of [mass%Cu](_{in Fe})<0.73 at 1523 K. The first order interaction parameter of Cu and B in the Fe phase at 1523 K,ε ^B_Cu , is determined to be 4.6 (±0.7). The second order interaction parameter of Cu and B in the Fe phase at 1873 K,ρ^B_Cu , is derived to be −33.3 (±3.1).