Plastic deformation of the precipitation hardened Cu-0·7 at.% Ti single crystals

Single crystals Cu-0·7 at.% Ti were deformed at room temperature in tension. The effect of the annealing time on the shape of the stress-strain curves has been investigated. The change of the stress-strain curve consisting of three regions to that one with one region only is observed if the annealing time is increased. There is a maximum in the dependence of CRSS on the annealing time fort=140 hours.The author wishes to thank to Dr. P.Kratochvil who stimulated this research and helped him. It is also the author's pleasure to thank to Ing. J.Bican of the Research Institute of Metals, who kindly prepared of Cu-Ti alloys. Also the determination of Ti content in all samples by Dr. J.Vrbský and Dr. Z.Ksandr of the Chemical College is acknowledged.