Crystal structure and morphology of a rare-earth compound in Cu-12Â wt.% Ag

0.3 wt.% rare-earth elements were added into Cu-12 wt.% Ag and some compound particles were observed in the eutectic colonies. The chemical composition and crystal structure of the compound were determined. The compound containing rare-earth elements can be represented as (Cu, Ag)6(Ce, La) and has a similar crystal structure to Cu6Ce of orthorhombic system. The (Cu, Ag)6(Ce, La) particles are hardly deformed during cold drawing. There is an incoherent interface between the compound and Ag-rich phase. Higher strain concentration and dislocation density are presented in the local region of Ag filaments close to the particles in the alloy of heavy drawing.