连续挤压对Cu-Cr-Zr合金组织与性能的影响  

Effects of conform on the microstructure and properties of Cu-Cr-Zr alloy

作　　者：吕昭弟 宋练鹏[1,2] 王凯[1] 张龙[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2016年第5期789-794,共6页Materials Science and Engineering of Powder Metallurgy

摘　　要：对Cu-0.71Cr-0.04Zr合金热挤压棒材进行连续挤压,得到相同直径的连续挤压棒材,采用扫描电镜（SEM）、透射电镜（TEM）以及X射线衍射仪（XRD）等对该合金在连续挤压前后的组织与物相组成进行观察与分析,并测试合金的抗拉强度与导电性能,研究连续挤压对该合金组织与性能的影响。结果表明,连续挤压后,合金的抗拉强度由228 MPa大幅提高到352 MPa,电导率略有下降,为52.4%IACS。合金经过连续挤压后,（111）晶面上的衍射峰强度大幅提升,粗大的晶粒消失,均匀分布着大量具有一定方向性的亚晶和形变晶粒,平均晶粒尺寸在0.5-1μm之间,夹杂少量平均尺寸约200nm的等轴再结晶晶粒,同时伴有细小的析出相析出。Hot extrusion rods of Cu-0.71Cr-0.04 Zr were subjected to conform in order to obtain conform rods with the same dimension. In this paper, scanning electron microscope（SEM）, X-ray diffraction（XRD） and transmission electron microscope（TEM） were employed to observe and analyse the microstructure and phase composition, and the tensile strength and electrical conductivity were also tested. The effects of conform process on the microstructure and properties of Cu-Cr-Zr alloy were investigated. The results show that conform can obviously increase the tensile strength from 228 MPa to 352 MPa, but slightly decrease the electrical conductivity, which is 52.4%IACS. After conform the intensity of peak（111） was enhanced significantly and the bulky grains disappear, and the grains change to be subgrain and deformed grains whose mean size is 0.5-1 μm. A few recrystallized grains whose mean size is 200 nm appear. In the meantime, fine precipitations distribute in the matrix.

关 键 词：连续挤压 CU-CR-ZR合金 晶粒取向 形变 析出相 

分 类 号：TG146.1[一般工业技术—材料科学与工程]