Enhanced mechanical strength of Cu–Sn alloy by Mg addition

Abstract

In recent years, the commercially available Cu–Sn alloy has attracted great interest within the new energy vehicles and industrial robots industries because of its relatively excellent comprehensive performance as compared to those of Cu–Ag and Cu–Mg alloys. In this work, we study the possibility of improving the tensile strength of Cu–Sn alloy via Mg addition. Our results show that, the addition of Mg could significantly improve the strength of the Cu–Sn alloy, the tensile strength of the Cu–Sn alloy was increased from 399MPa to 427MPa by 0.02 wt.% Mg addition after 80% cold-rolled reduction. This can be ascribed to the combined effect of the acceleration of the grain refinement and the promotion of the sub-structures formation by Mg addition during cold rolling process. Larger number density and more uniformly distributed sub–structures with an average size of 120 nm were formed in Mg-contained alloy than that in Mg-free alloy after 80% reduction. However, the Mg addition slightly decreased the electrical conductivity (EC) of the alloy (1.5%IACS), because of the lattice distortion caused by Mg atoms.

Influences of Sn on Fe phase segregation and properties of Cu-5Fe alloy

“…The difference between the strengths of the Cu-5Fe-0.15Sn alloy (745 MPa) and that of the Cu-5Fe alloy (655 MPa) is 90 MPa at η = 7, which is much greater than the difference when η = 6. It shows that Sn enhances the strengthening rate of the Cu-5Fe alloy during plastic deformation, which is similar to previous research results [13].…”

“…Sn is a low-cost element with stable chemical activity, which can effectively strengthen Cu alloys [12,13]. Luo [14] found that Sn in minute quantities can effectively increase the hardening rate and softening temperature of the alloy.…”

Molecular Dynamics Study on Mechanical Properties of Nanopolycrystalline Cu–Sn Alloy

“…Due to the reliability demand of bearing parts, which require excellent comprehensive mechanical properties, it is valuable and practical to research the influencing factors of strength, ductility and elastic modulus for Cu-Sn alloy. Although there have been a large number of studies of Cu-Sn alloy [4][5][6], the research on the mechanical properties of nanopolycrystalline Cu-Sn alloy at the atomic level is limited.…”