14. A copper wire must be drawn to a diameter of 1/8 inches. We are starting with stock having diameter of 0.25 inches. The wire's final %EL ductility must be greater than 20%. The yield strength must exceed 30 ksi. Describe the processing of this wire. (Maybe multiple steps?) 70 Yield strength (MPa) 800 1040 Steel 700 100 600 500 60 Brass 400 300 200 Copper 40 100 0 10 20 30 40 50 60 70 Percent cold work 80 120 60 Yield strength (ks) Ductility (%EL) 50 40 30 Brass 20 10 1040 Steel 201 Copper 10 20 30 40 50 60 70 Percent cold work