FORMATION OF SUPERSATURATED SOLID-SOLUTIONS BY MECHANICAL ALLOYING INTHE SYSTEM COPPER IRON

The formation of super saturated solid solution in Cu - Fe system with positive heat of formation during mechanical alloying has been invest igated. The solid solutions in wide concentration range were obtained. Alloys with 0 to 60 at. %. Fe have fcc structure, while alloys with m ore than 70 at. % Fe have bcc structure. The dependence of obtained so lid solution concentrations on mechanical alloying conditions is shown . The possible mechanism of solid solution formation by rapid quenchin g of liquid phase (the fusion zones) which arises in the particles def ormed by localized shear during a collision between balls was suggeste d. The experimental results which confirm the dependence of obtained s olid solution concentration on ball size were presented.