高强高导电CuCrZr合金时效过程中析出相的演化规律  

Evolution of precipitated phases in high strength and high electrical conductivity Cu-Cr-Zr alloy during aging

作　　者：潘雪新[1] 姜海昌[1] 封辉[1,2] 李学斌 鲁衍任 胡小锋 付鸿[1] Pan Xuexin;Jiang Haichang;Feng Hui;Li Xuebin;Lu Yanren;Hu Xiaofeng;Fu Hong(CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang Liaoning 110016,China;CNPC Tubular Goods Research Institute,Xi’an Shannxi 710077,China;China Railway Construction Electrification Bureau Group Kang Yuan New Material Co.,Ltd.,Jiangyin Jiangsu 214521,China)

机构地区：[1]中国科学院金属研究所中国科学院核用材料与安全评价重点实验室,辽宁沈阳110016 [2]中国石油集团石油管工程技术研究院,陕西西安710077 [3]中铁建电气化局康远材料有限公司,江阴江苏214521

出　　处：《金属热处理》2021年第7期7-12,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2016YFB03006001);沈阳市双百项目(Z19-1-004)。

摘　　要：对固溶态CuCrZr合金经不同温度时效后的析出相进行显微观察,并对其电导率进行了测试。结果表明:450℃时效30 min的析出相为5 nm以下的单质Cr相,并且与基体呈cube-on-cube取向关系。450℃峰值时效120 min时析出相为CrCu_(2)Zr相和Cr相,尺寸为10nm左右,且与基体共格;600℃和800℃过时效30 min后析出相主要演变为球状的Cr相和棒状的Cu_(4)Zr相。在600℃时效处理后部分棒状析出相已显著长大至50μm左右,而800℃时效处理后几乎看不到细小的析出相,其中棒状Cu_(4)Zr析出相长大至200μm以上,球状纯Cr析出相也接近50μm。CuCrZr合金在450℃时效时导电率随时效时间的延长不断增高,在120 min后达到最大值且几乎不再变化。根据析出相转化率与导电率的线性关系,建立了合金在400、450、500和600℃下的析出动力学方程。Precipitated phases in a CuCrZr alloy after aging at different temperatures were observed,and the electrical conductivity of the alloy was tested.The results show that after aging at 450℃for 30 min,pure Cr precipitates with diameter of less than 5 nm are produced and obey the cube-on-cube orientation relationship with the matrix.After peek aging at 450℃for 120 min,the precipitates are indexed as CrCu_(2)Zr and Cr,which are coherent with the matrix and in a size of about 10 nm.After over aging at 600℃and 800℃respectively for 30 min,the precipitates change into rod-like Cu_(4)Zr and spherical Cr phases.When aging at 600℃,some of the rod-like precipitates have grown to about 50μm.When aging at 800℃,almost no fine precipitates are found,while the rod-shaped Cu_(4)Zr precipitates grow to more than 200μm,and the spherical pure Cr precipitates to near 50μm.The electrical conductivity of the CuCrZr alloy increases with the extension of the aging time during aging at 450℃and reaches the maximum value at 120 min and then hardly changes.Based on the linear relationship between the conversion rate of precipitated phases and the electrical conductivity during aging process,the precipitation kinetics equations of the CuCrZr alloy aging at 400,450,500 and 600℃are established.

关 键 词：CUCRZR合金 析出相 组织演化 导电率 动力学方程 

分 类 号：TG142.1[一般工业技术—材料科学与工程]