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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.
The effects of DC magnetic field on the thermoelectric power of aluminum alloy at different temperatures were studied.The results showed that the thermoelectric power of Al-2.89% Fe alloy melt decreased gradually when the strength of magnetic field applied to both ends of the sample varied greatly. , The reduced thermoelectric power takes some time to slowly recover to the initial value before the magnetic field is applied.This phenomenon is commonly observed in aluminum alloy melts of different compositions and temperatures (including pure Al) at different temperatures.Samples two The larger the square deviation of the terminal magnetic flux density, the larger the variation of the thermoelectric power. Under the action of an approximately uniform magnetic field, the thermoelectric potential of the liquid aluminum alloy does not change. According to the theory of weak localization, the magnetic field causes the additional phase of electrons in the transmission process, Changed the distribution of the extended state electrons in the system, resulting in the change of the thermoelectric power of the alloy melt.