La、Ce对镁合金散热性能的影响机理  

Influence Mechanism of La and Ce on the Thermal Conductivity of Magnesium Alloys

作　　者：杨正华 何伟[1,2] 胡文鑫 李媛 刘峰[1,2] YANG Zhenghua;HE Wei;HU Wenxin;LI Yuan;LIU Feng(National Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou 014030;Baotou Research Institute of Rare Earths,Baotou 014030;Baotou Metallurgical Building Research Institute,Baotou 014030)

机构地区：[1]白云鄂博稀土资源研究与综合利用全国重点实验室,包头014030 [2]包头稀土研究院,包头014030 [3]包头冶金建筑研究院,包头014030

出　　处：《特种铸造及有色合金》2024年第6期837-843,共7页Special Casting & Nonferrous Alloys

基　　金：内蒙古自然科学基金资助项目(2022MS05045)。

摘　　要：针对传统商业镁合金热导率低的问题,设计合金成分以研究镁合金组织中La、Ce固溶度及第二相尺寸形态、分布及体积分数对Mg-RE二元体系及Mg-Mn-La(Ce)体系散热性能的影响。结果表明,铸态和固溶态Mg-La(Ce)二元合金的热导率均随着添加元素的增加而逐渐降低。经过固溶处理后Mg-La(Ce)二元合金的热导率高于铸态合金的热导率。Ce的添加有助于细化Mg-0.5Mn合金的铸态组织,并且随着Ce添加量的增加,Mg12Ce相的体积分数增加。随着温度升高,铸态Mg-0.5Mn-x Ce合金的热导率逐渐增加。同时,在常温下铸态Mg-0.5Mn合金的热导率随着Ce的添加量增加而逐渐下降,因Mg12Ce相的析出,下降速度逐渐减缓。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-xCe 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.

关 键 词：镁合金 稀土La CE 机理 

分 类 号：TG146.22[一般工业技术—材料科学与工程]