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

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.