Kim Yong-Ho, Yoo Hyo-Sang, Lee Seong-Ho, Lee Gyu-Seok, Son Hyeon-Taek
EV Components & Materials Group, Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju 61012, Republic of Korea.
J Nanosci Nanotechnol. 2020 Jan 1;20(1):293-297. doi: 10.1166/jnn.2020.17250.
In this study, we investigated the effect of Mg addition (0, 0.5, and 1.0 wt%) on the microstructure, mechanical properties, and thermal conductivity of as-extruded Al-RE alloys. With an increase in the Mg content from 0 to 1.0 wt%, the average grain size of the alloys decreased remarkably from 740 to 130 m and the high-angle grain boundary fraction increased from 35 to 54%. The addition of Mg resulted in the grain refinement of the Al-1.0RE alloy because of the dynamic recrystallization caused by the solute Mg atoms during the extrusion. With an increase in the Mg content from 0.5 to 1.0 wt%, thermal conductivity of the alloy decreased from 231 to 193 W/mK because of the electric scattering caused by the solute Mg atoms. With an increase in the Mg content from 0 to 1.0 wt%, the ultimate tensile strength of the alloy increased remarkably from 74 to 120 MPa, while the strain reduced from 44 to 34%. This improvement in the strength resulted from the grain refinement and solid solution strengthening due to the solute Mg atoms. The Mg addition amount affected the thermal conductivity and strength of the alloys significantly.
在本研究中，我们研究了添加镁（0、0.5和1.0 wt%）对挤压态Al-RE合金的微观结构、力学性能和热导率的影响。随着镁含量从0增加到1.0 wt%，合金的平均晶粒尺寸从740显著减小到130 µm，高角度晶界分数从35%增加到54%。镁的添加导致Al-1.0RE合金晶粒细化，这是由于挤压过程中溶质镁原子引起的动态再结晶。随着镁含量从0.5增加到1.0 wt%，由于溶质镁原子引起的电子散射，合金的热导率从231降低到193 W/mK。随着镁含量从0增加到1.0 wt%，合金的极限抗拉强度从74显著增加到120 MPa，而应变从44%降低到34%。强度的这种提高源于溶质镁原子引起的晶粒细化和固溶强化。镁的添加量对合金的热导率和强度有显著影响。
