Annealing characteristics of supersaturated vacancies in copper and nickel

Defect processes during isothermal annealing of rapidly quenched Cu (from 1 000 degreesC) and isochronal annealing of quenched (from 1400 degreesC) and deformed Ni (20% rolled at room temperature) have been investigated by res idual resistivity and positron lifetime measurements, In Cu a transformatio n of vacancy loops of the Frank type into loops of split Shockley partials was concluded. In Ni the growth of ultrasmall stacking fault tetrahedra cou ld be the dominating process in vacancy annealing.