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金属学报  2013, Vol. 49 Issue (9): 1069-1074    DOI: 10.3724/SP.J.1037.2013.00231
  论文 本期目录 | 过刊浏览 |
直流磁场作用下液态铝合金热电势的变化
张建锋1,2),王红玲2),乐启炽2),巴启先2),崔建忠2)
1) 东北大学理学院, 沈阳 110819
2) 东北大学材料电磁过程研究教育部重点实验室, 沈阳 110819
CHANGE OF THERMOELECTRIC POWER OF LIQUID Al ALLOYS CAUSED BY DC MAGNETIC FIELD
ZHANG Jianfeng1,2), WANG Hongling2), LE Qichi2), BA Qixian2), CUI Jianzhong2)
1) Science College, Northeastern University, Shenyang 110819
2) Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819  
引用本文:

张建锋,王红玲,乐启炽,巴启先,崔建忠. 直流磁场作用下液态铝合金热电势的变化[J]. 金属学报, 2013, 49(9): 1069-1074.
ZHANG Jianfeng, WANG Hongling, LE Qichi, BA Qixian, CUI Jianzhong. CHANGE OF THERMOELECTRIC POWER OF LIQUID Al ALLOYS CAUSED BY DC MAGNETIC FIELD[J]. Acta Metall Sin, 2013, 49(9): 1069-1074.

全文: PDF(800 KB)  
摘要: 

研究了在不同温度下, 直流磁场对铝合金热电势的影响. 结果显示:当施加在样品两端的磁场强度相差较大时, Al-2.89%Fe合金熔体的热电势逐渐降低.撤除磁场作用后, 降低的热电势需要经一段时间,才能缓慢恢复到施加磁场前的初始值. 这种现象,在不同温度、不同成分的铝合金熔体(包括纯Al)中被普遍观察到.样品两端磁感应强度平方差越大, 热电势变化量越大; 在近似均匀磁场作用下,液态铝合金的热电势没有发生变化. 根据弱局域化理论,磁场使电子在传输过程中产生附加相位, 改变了体系中扩展态电子的分布,从而导致合金熔体的热电势发生变化.

关键词 直流磁场热电势液态铝合金    
Abstract

The effect of DC magnetic field on the thermoelectric power of Al alloys at different temperatures was investigated in this work. The results showed that if the magnetic field intensity difference between the two ends of the sample was large, it would lead to a decrease in thermoelectric power of liquid Al-2.89% Fe Al alloys. When the magneticfield was removed, it took a period of time for the thermoelectric power to increase gradually to the initial value. This phenomenon had been observed in other Al alloys melt at different temperature. The higher the square difference of magnetic induction was, the more significant thermoelectric power changed. The approximate homogeneous magnetic field had no effect on the thermoelectric power. According to the theory of weak localization, the magnetic field can change the distribution of extended states electrons which contributes to the change of thermoelectric power.

Key wordsDC magnetic field    thermoelectric power    liquid Al alloy
收稿日期: 2013-04-29     
基金资助:

国家重点基础研究发展计划项目2013CB632203, 国家自然科学基金项目50974037及国家科技支撑计划项目2012BAF09B01资助

作者简介: 张建锋, 男, 1979年生, 讲师, 博士生

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