Yoo Hyo-Sang, Kim Yong-Ho, Lee Kyu-Seok, Lee Sung-Ho, Lee Seong-Hee, Son Hyeon-Taek
EV Components & Materials R&D Group, Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 61012, Republic of Korea.
Department of Materials Science and Engineering, Mokpo National University, Muan, 58554, Republic of Korea.
J Nanosci Nanotechnol. 2020 Jan 1;20(1):530-534. doi: 10.1166/jnn.2020.17275.
In this study, we investigate the microstructure and mechanical properties of as-extruded Al-1.0RE alloys. The molten Aluminum alloy was maintained at 800 °C and then poured into a mould at 200 °C. Aluminum alloys were hot-extruded into a rod measuring 12 mm thick with a reduction ratio of 38:1. The microstructure and electric conductivity properties of as-extruded Al-1.0RE alloy under different annealing processes were investigated and compared. After extrusion, the intermetallic compound having a needle shape in the cast state was finely decomposed based on the direction of extrusion. Significant changes in the microstructure were detected after annealing at 500 °C with fragmentation and sphering of eutectic particles. The annealing temperature of Al-1.0RE alloy increased proportionally to the electrical conductivity. The formation of Al-RE intermetallic compounds increases the electrical conductivity and improves the mechanical properties of the alloy through precipitation hardening.
在本研究中，我们研究了挤压态Al-1.0RE合金的微观结构和力学性能。将熔融铝合金保持在800℃，然后在200℃倒入模具中。将铝合金热挤压成厚度为12mm的棒材，挤压比为38:1。研究并比较了不同退火工艺下挤压态Al-1.0RE合金的微观结构和导电性能。挤压后，铸态下呈针状的金属间化合物基于挤压方向被精细分解。在500℃退火后，共晶颗粒发生破碎和球化，微观结构发生显著变化。Al-1.0RE合金的退火温度与电导率成正比。Al-RE金属间化合物的形成增加了电导率，并通过沉淀硬化提高了合金的力学性能。
