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Analysis of Microstructure and Electric Conductivity in Al-RE Alloy by Heat-Treatment Condition
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.
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Keywords: Aluminum Alloy; Extrusion; Mechanical Properties; Microstructure; Rare Earth
Document Type: Research Article
Affiliations: 1: EV Components & Materials R&D Group, Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju, 61012, Republic of Korea 2: Department of Materials Science and Engineering, Mokpo National University, Muan, 58554, Republic of Korea
Publication date: 01 January 2020
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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