Influence Mechanism of La and Ce on the Thermal Conductivity of Magnesium Alloys
Aiming at the problem of low thermal conductivity of traditional commercial magnesium alloys,the compo-sition of rare earth magnesium alloys was desgined.The effects of solid solubility of La and Ce and size,distribution and volume fraction of the second phase in the microstructure of magnesium alloy on the heat dissipation performance of Mg-RE binary system and Mg-Mn-La(Ce)system were investigated.The results show that the thermal conductivity of the as-cast and solid-solution Mg-La(Ce)binary alloy are decreased gradually with the increase of element content.The thermal conductivity of Mg-La(Ce)binary alloy after solution treatment is higher than that of as-cast alloy.Ce addition is helpful to refine the microstructure of as-cast Mg-0.5Mn alloy,and the volume fraction of Mg12Ce phase is increased with the increase of Ce content.The thermal conductivity of as-cast Mg-0.5Mn-x Ce alloy is increased with the increase of temperature.At the same time,the thermal conductivity of as-cast Mg-0.5Mn alloy at room tempera-ture is gradually decreased with the increase of Ce addition,and the decline rate is gradually retarded due to the precipi-tation of Mg12Ce phase.
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