Cross-Sectional Distributions of Mechanical Properties of Fine Cu–Sn Alloy Wire Manufactured by Continuous Rotary Draw Bending

Abstract

The changes in the mechanical properties on the inside and outside of the bend of Cu0.3 mass% Sn wire specimens deformed by rotary draw bending were clarified, and the correlation between the changes in the misorientation of substructures and in the mechanical properties was systematically investigated. The specimens were each divided into two parts, i.e., the inside and outside of the bend, and their mechanical properties and microstructure evolution were measured by performing tensile tests. From the results, it was found that the ultimate tensile strength and 0.1% proof stress on the inside of the bend decreased markedly and that the total elongation was improved upon rotary draw bending. Although the tensile strength on the inside of the bend decreased, the change in grain size was very small. If rotary draw bending is performed on a wire specimen, it is considered that the dislocations generated by the tensile stress field are relaxed by the reversed stress induced during such bending.