Structure, conductivity and mechanical properties of non-equilibrium copper-based crystalline alloy nano-composites

Non-equilibrium copper-based crystalline alloy sheet having ultrahigh strength and good electrical conductivity

“…In addition, 0.2 , Young's modulus (E) and ε p are 1097 MPa, 108 GPa and 1.2%, respectively. The ε p value obtained in the present study is lower than the one reported in our previous study [8]. However, the f value exceeding 1500 MPa is much higher than that reported for Cu-Be alloy [12], indicating the successful preparation of low height electrical connector using thinner sheets.…”

“…2(c)). Zr content of the primary fcc-Cu dendrite phase and eutectic fcc-Cu phase after cold rolling is further decreased to 1.2 ± 0.2 and 2.2 ± 0.3 at.%, respectively, indicating the mechanical deformation induced structural change [8]. Compared with the previous work [8], the high cooling rate was achieved by the PDC method, as evidenced by the smaller secondary DAS of fcc-Cu dendrites of about 2 m and the lower Zr content in the Cu 5 Zr phase of only 10.2 ± 1 at.%.…”

“…However, a novel conductive Cu-based alloy with higher f and good electrical conductivity ratio (Ä) is strongly required for the development of electrical connectors with lower height and finer pitch. By using this concept, we have successfully developed a new non-equilibrium Cu-based alloy with a f of 1200 MPa, ε p of 3.1% and Ä of 30.7% IACS (defined as the resistivity ratio to the international annealed copper), respectively [8]. We found that the supersaturated Zr content in the fcc-Cu phase is decomposed by annealing, leading to the improvement of Ä.…”

Glassy Alloy Composite and Non-equilibrium Crystalline Alloy for Information Technology Applications

“…After following additional heavy working process, the structure of various non-equilibrium phases with long-periodic hexagonal structure [6] or nano fibrous structure consisting of fcc-Cu and non-equilibrium Cu 9 Zr 2 phases [7] could be formed. By utilization of such a concept, we have developed novel Cu-based non-equilibrium crystalline alloys with high strength of exceeding 1500 MPa and good electrical conductivity of 30% IACS [8,9]. The developed alloys are expected to be alternative materials to Cu-Be alloys.…”