EFFECT OF ELECTROLYTE ADDITIVE CONCEN-TRATION ON MICROSTRUCTURE OF DIRECT-CURRENT ELECTRODEPOSITED NANOTWINNED Cu

Nanotwinned metals have attracted widespread attentions recently, due to their unique overall properties, such as high strength, considerable ductility, enhanced work hardening and high electrical conductivity. The method of synthesized nanotwinned metals is an essential factor for influencing its application. To date, the direct-current electrodeposition technique is successfully used to fabricate bulk nanotwinned Cu samples. However, many parameters, such as the density of current, additive, the concentration of Cu, pH and temperature, influence the formation of nanoscale twins during electrodeposited process. To understand the effect of electrolyte additive on the formation of twins, in this work, gelatin with different concentrations was added into the electrolyte while other parameters are kept invariant. Bulk Cu with preferentially oriented nanoscale twins was synthesized in CuSO4 electrolyte with different concentrations of gelatin. The nanotwinned Cu sample is composed of columnar grains with high density nanoscale coherent twin boundaries, most of them are parallel to the growth surface. It is found *国家自然科学基金项目51420105001, 51371171和51471172及国家重点基础研究发展计划项目2012CB932202资助 收到初稿日期: 2015-10-15,收到修改稿日期: 2015-12-30 作者简介:金帅,男, 1980年生,工程师 DOI: 10.11900/0412.1961.2015.00536 第973-979页 pp.973-979