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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
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~~
关键词
电磁复合场
铜铬锆合金
时效析出
显微硬度
static magnetic and electric field, Cu-Cr-Zr alloy, electric conductivity, micro hardness
