静磁场复合电流下时效对Cu-Cr-Zr合金组织及性能的影响  

Electrical and mechanical properties of a Cu-Cr-Zr alloy aged under an imposed DC current and static magnetic field

作　　者：饶显君[1] 钟云波[1] 张增光[1] 王志强[1] 邓康[1] 任忠鸣[1] 徐匡迪[1] 

机构地区：[1]上海大学现代冶金重点实验室,上海200072

出　　处：《物理学报》2012年第22期173-181,共9页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2009AA03Z109);上海市教育委员会重点项目(批准号:09zz98);上海市政府科学技术委员会重点项目(批准号:09dz1206401;09dz1206402);高等学校博士学科点专项科研基金(批准号:20093108110012)资助的课题~~

摘　　要：本文在经过固溶和冷变形处理Cu-Cr-Zr合金的等温时效过程中同时施加电流密度为100A/cm2的直流电流和不同磁感应强度的静磁场,发现电磁复合场能显著影响Cu-Cr-Zr合金的组织及性能.和无磁场下时效后合金性能相比,施加磁场后的合金电导率和显微硬度值均有一定程度的升高,其中在350℃,10T磁场下效果最明显,分别升高了22.1%IACS和25.3HV.利用透射电镜观察显微组织观察发现,施加磁场后合金组织中位错密度有所降低,同时出现了大量细小弥散的铬析出物,表明电磁复合场能进一步促进铜合金的时效过程,在低温时效时尤其明显.分析认为,电磁复合场对Cu-Cr-Zr合金时效过程的促进作用机理是磁场增强了电流的"电子风"效应.In this paper, Cu-0.41wt.%Cr-0.21wt.%Zr alloy is subjected to an isochronal aging treatment with a DC electric current （100A/cm2） and a static magnetic field simultaneously imposed. The alloy in the form of plate with a thickness of 2 mm is solid- solution-treated and cold deformed with a total area reduction of more than 98% before aging. The results indicate that the conductivity and micro hardness of the sample are significantly improved by the imposed electric- magnetic field. The conductivity of the sample increases with magnetic flux density （MFD） improving, especially at a lower aging temperature （350 ℃）, and a maximum improvement of 22.1% IACS in conductivity could be obtained with a 10 T magnetic field. For the property of micro hardness, it increases with MFD increasing at a lower aging temperature （350 ~C）, while at a higher aging temper- ature, it first increases and then decreases with MFD increasing. The effects of the DC current and magnetic field on the microstructure of the alloy are investigated by transmission electron microscopy. A lower dislocation density and more Cr precipitation are observed under electric-magnetic couple field than under the DC current only. It indicates that the electric and magnetic fields enhance the aging process of Cu-Cr-Zr alloy distinctly. According to the experimental results, we believe that the main mechanism of the influence of electric and magnetic fields on the Cu-Cr-Zr alloy is that the magnetic field enhances the interaction between solute atoms, vacancies, dislocations and electron wind force, thereby intensifing the effect of the dc current.

关 键 词：电磁复合场 铜铬锆合金 时效析出 显微硬度 

分 类 号：TG156.92[金属学及工艺—热处理]