高强高导Cu-Cr-Zr合金的微观组织与性能  

Microstructure and Property of Cu-Cr-Zr Alloys with High Strength and High Conductivity

作　　者：马健凯 王宥宏[1] 杨雨潭 张俊婷[1] 李秋书[1] 郝维新[1] 

机构地区：[1]太原科技大学材料科学与工程学院,太原030024

出　　处：《材料导报》2015年第22期96-100,共5页Materials Reports

基　　金：国家自然科学基金(50804032);山西省自然基金(2014011015-3)

摘　　要：Cu-Cr-Zr合金是电气化铁路接触网装备的重要材料,其抗拉强度和导电率性能要求较高。采用高频熔炼、铜模快冷、固溶处理、冷轧和退火处理制作了Cu-Cr-Zr合金样品,分析了其显微组织、抗拉强度和导电率之间的关系。在铜晶粒内部和晶界上析出的第二相Cu5Zr和其他多元化合物是Cu-Cr-Zr合金获得高强度的主要原因。固溶体中的Cr、Zr溶质含量是影响合金电阻率的主要因素,纳米及亚微米级的第二相可使合金获得较好的强度和导电性。冷轧后试样经过450℃、550℃退火处理,发现550℃退火处理后Cu-0.7Cr-0.4Zr合金的抗拉强度可达550MPa,导电率达82.5%IACS。Cu-Cr-Zr alloy is the important material of electrified railway catenary equipment, which requires high tensile strength and electrical conductivity. The Cu-Cr-Zr alloy melted with the high-frequency melting was solidified in a copper mold. The solution treatment, cold rolling and annealing treatment for the Cu-Cr-Zr alloys were conducted sequentially. The relationships between the microstructure, the tensile strength and the electrical conductivity were analyzed. The second phase Cu5Zr and other multi-compound on the grain boundary and the copper grain interior may be the main reason to obtain the high strength of Cu Cr-Zr alloy. The solute content of Cr, Zr of solid solution was major contributors to the resistivity of the alloy. The nano-size or sub-micron second phases can get better strength and electrical conductivity of Cu-C〉Zr alloy. After cold-rolled and annealed at 450 ℃, 550 ℃, the tensile strength of Cu-0. 7Cr-0. 4Zr alloy by annealing treatment at 550 ℃ is 550 MPa, and the electrical conductivity is 82.5% IACS.

关 键 词：Cu—Cr-Zr合金 架空线 抗拉强度 导电率 

分 类 号：TF152.211[冶金工程—冶金物理化学]