Patent ID: 7767043

Claim:
A method of forming a copper-comprising sputtering target, comprising: providing a Cu billet having a purity of at least 99.99% copper; hot-forging the Cu billet at a temperature of greater than 300° C. with a reduction in height of at least about 40% to form a forged block; water quenching the forged block; performing an extrusion process comprising: at least four passes of the forged block through equal channel angular extrusion (ECAE); and a heat-treatment comprising one or both of intermediate annealing between at least some of the at least four passes, and heating ECAE die to a temperature of from about 125° C. to about 225° C. during the extrusion process; after extrusion process, cold-rolling to a reduction of less than 90% to form a blank; and forming the blank into a target.