Comparative Study on Microstructure and Properties of Domestic and Imported Cu-2Ag Alloy Wirebar

Abstract

The chemical composition, microstructure, mechanical properties and electrical conductivity of domestic and imported Cu-2Ag alloy wirebar were studied by inductively coupled plasma atomic emission spectrometry (ICP-AES), oxygen analyzer, scanning electron microscope (SEM), transmission electron microscope (TEM), universal tensile testing machine and electronic micro ohmmeter. The results show that compared with imported Cu-2Ag alloy wirebar, domestic u-2Ag alloy wirebar has poor composition uniformity and purity, coarse and uneven grain, uneven distribution and segregation of Ag. These shortcomings of domestic Cu-2Ag alloy wirebar are the fundamental reasons for its large fluctuation of performance, slightly low plasticity and conductivity, and frequent wire breakage during micro drawing. In order to improve the micro drawing processing performance of domestic Cu-2Ag alloy wirebar, it can be considered to use rare earth refining to remove impurities during alloy melting for improving the purity of the material and refining grains, increase the cooling rate of wirebar during large deformation processing and heat treatment for reducing the precipitation of Ag atoms and improving the composition uniformity and mechanical properties of the material.