直流梯度磁场对Al合金热电势的影响  

Effect of DC Gradient Magnetic Field on Thermoelectric Power of Al Alloys

作　　者：张建锋[1,2] 乐启炽[2] 巴启先[2] 崔建忠[2] 

机构地区：[1]东北大学理学院,辽宁沈阳110819 [2]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2013年第8期1109-1112,1117,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51074207;50974037);"十二五"国家科技支撑计划项目(2011BAE22B03)

摘　　要：研究了Al合金的热电势在直流梯度磁场中的行为.结果发现:在直流梯度磁场作用下,Al-2.89%Fe合金熔体的热电势降低;关闭磁场,降低的热电势没有立刻回升,而是在保持一段时间不变后,才缓慢恢复到施加磁场前的初始值.温度越高,热电势增速越快,增量越多,回归速度也越快.这种磁效应,在不同温度、不同成分的Al合金熔体(包括纯Al)中被普遍观察到;而在固态纯Al和Al合金中尚未观察到这种效应.在均匀磁场作用下,液态Al合金的热电势也没有发生变化.根据局域理论,定性地解释了磁场对合金熔体热电势的影响.The behavior of thermoelectric power of Al alloys in a DC gradient magnetic field was investigated.The results show that the DC gradient magnetic field leads to a decrease in thermoelectric power of liquid Al-2.89%Fe alloys.When the magnetic field is removed,it takes a period of time for the thermoelectric power to increase gradually to the initial value.With the increasing temperature,the thermoelectric power increases rapidly,the increment increases,and the regression speed increases.This phenomenon is observed in other Al alloys melt,but is not observed both in solid-state pure Al and Al alloys in a gradient magnetic field and liquid-state Al alloys in a homogeneous magnetic field.The theory of localization was used to explain the effect of the magnetic field on the thermoelectric power.

关 键 词：直流梯度磁场 热电势 AL合金 局域理论 电子态分布 

分 类 号：TG111.1[金属学及工艺—物理冶金]