定向凝固速度对Mg-Ag-Zn合金导热率的影响（英文）  

Effect of the Pulling Velocity of Directional Solidification on Thermal Conductivity of Mg-Ag-Zn Alloys

作　　者：马雁翔[1,2] 李秋书 王旭东[2] Ma Yanxiangl,;Li Qiushu;Wang Xudong(Taiyuan University of Science and Technology,Taiyuan 030024,China;Zhiqi Railway Equipment Co.Ltd,Taiyuan 030032,China)

机构地区：[1]太原科技大学,山西太原030024 [2]智奇铁路设备有限公司,山西太原030032

出　　处：《稀有金属材料与工程》2018年第8期2360-2364,共5页Rare Metal Materials and Engineering

基　　金：Innovation Projects Post-graduate Education Program of Shanxi Province(2016BY137)

摘　　要：制备铸态Mg-1Ag-Zn,Mg-3Ag-Zn和Mg-5Ag-Zn合金试样,并计算其导热率。随着Ag含量的增加,铸态合金试样的导热率减小。再将其铸态合金的试样以3种不同的定向凝固速率(V=25μm/s,V=50μm/s,V=75μm/s)制备成定向凝固试样,计算其定向凝固试样的导热率。结果显示:随着定向凝固速率的增加,合金的导热率降低。合金中溶质元素的含量与定向凝固速率是影响导热率的重要因素,这2个因素可以增强电子和声子的散射过程,减少自由行程,最终降低合金的导热率。Specimens of as-cast Mg-lAg-Zn, Mg-3Ag-Zn and Mg-5Ag-Zn alloys were fabricated, and then the specimens＇ thermal conductivity was calculated. With the increase of Ag content, the thermal conductivity of as-cast alloys decreases significantly. After that, directionally solidified specimens of the above mentioned as-cast Mg-Ag-Zn alloys were made at three different pulling velocities： V=25 μm/s, V=50 μm/s, V=75 μm/s, and then their thermal conductivity was calculated again. The results show that with the increase of the pulling velocity, the thermal conductivity of alloys decreases significantly. Variations in the solute content and the pulling velocities are believed to play important roles in the thermal conductivity of Mg-Ag-Zn alloys. Since these two factors can strengthen the electron＇s scattering process, reduce their free path, and thereby reduce the alloys＇ thermal conductivity.

关 键 词：镁合金 定向凝固 Ag含量 导热率 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG292[金属学及工艺—金属材料]