化合物相的析出对Mg-Sn二元合金导热性能的影响

发布时间：2018-06-17 01:53

本文选题：镁合金 + 导热性能　；参考：《稀有金属材料与工程》2017年11期

【摘要】：研究了添加不同含量的Sn(3%,6%,9%,质量分数)对铸态、固溶态及时效态Mg-Sn二元合金导热性能的影响。结果表明,铸态及固溶处理态Mg-Sn合金的热导率均随着Sn元素含量的增加不断降低,其中Sn含量最多的固溶态Mg-10Sn合金所对应的热导率降低至52.6 W/(m·K);同固溶态合金相比,相同溶质含量的铸态合金的热导率更高。Mg-Sn合金的热导率随时效的进行逐渐升高,Mg-3Sn、Mg-6Sn及Mg-10Sn合金的热导率分别最终可达到125、120及110 W/(m·K)。分析表明,镁合金热导率的不断升高可以归结于基体的纯化效应,Sn元素的原子大小、核外电子分布以及化合价等均会对Mg-Sn合金的导热性能产生影响。
[Abstract]:The effect of Sno _ 3 with different content and mass fraction on the thermal conductivity of as-cast, solid solution and aged Mg-Sn binary alloys was studied. The results show that the thermal conductivity of as-cast Mg-Sn alloy and solid solution-treated Mg-Sn alloy decreases with the increase of Sn content, and the thermal conductivity of Mg-10Sn alloy with the highest Sn content decreases to 52.6 W / m ~ (-1) K ~ (-1), compared with the solid solution alloy. The thermal conductivity of as-cast alloys with the same solute content is higher. The thermal conductivity of Mg-Sn alloys increases gradually with aging. The thermal conductivities of Mg-3SnOMg-6Sn and Mg-10Sn alloys can finally reach 125120 and 110W / m K ~ (+), respectively. The analysis shows that the increasing thermal conductivity of magnesium alloy can be attributed to the purification effect of matrix and the influence of the atomic size of Sn element, the distribution of electrons outside the nucleus and the valence of Mg-Sn alloy on the thermal conductivity of Mg-Sn alloy.
【作者单位】：东北大学材料各向异性与织构教育部重点实验室;重庆大学国家镁合金材料工程技术研究中心;重庆交通大学;
【基金】：国家自然科学基金(51171043,51371046,51501032) 中央高校基本科研业务费(N130510002,N141003001,L1502025,L1502047) 辽宁省科技厅一般项目(L20150176,CQZJKY2013001,2014QK263,CX201407)
【分类号】：TG146.22

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