2021 年 60 巻 1 号 p. 67-73
Low Ti content Cu–Ti alloys with small additions of Co and Ag, i.e., Cu–Ti–Co and Cu–Ti–Co–Ag alloys, were heavily cold rolled. A typical lamellar structure as well as heterogeneous–nano one was developed in both alloys. Increment of the lamellar spacing during low temperature aging was effectively suppressed by Ag addition. Both alloys exhibited well–balanced properties of tensile strength over 1 GPa, ductility over 10% and electrical conductivity over 20%IACS were achieved after peak aging, all which exceeded those of the commercial Cu–Ti alloys with relatively higher concentrations of Ti. However, Ag addition more emphasized the above properties. These specific properties attributed to the heterogeneous–nano structure which induced matrix strengthening and homogeneous precipitation instead of Spinodal decomposition.
