The mechanical properties, electrical conductivity, and thermal stability of a wire made of Al–Fe alloys produced by casting into an electromagnetic crystallizer

A. Medvedev, O. O. Zhukova, D. D. Fedotova, M. Murashkin
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Abstract

The development and production of new aluminum-based materials is a critical task of the up-to-date industry. Particularly, new materials are necessary to produce light, strong, and thermally-stable wires and cables for household usage, transport, and power sphere. The paper presents the results of the study of the microstructure and physical and mechanical properties of Al–0.5Fe and Al–1.7Fe alloys (wt. %), produced by continuous casting into an electromagnetic crystallizer (EMC). The authors carried out a comparative analysis of alloys under the study and commercial alloys. During this analysis, the authors produced a wire with the diameter of 3 mm from the primary cast blanks by the cold drawing method (CD). The microstructure analysis showed that as a result of casting into an electromagnetic crystallizer, the particles of metastable modification Al2Fe phase appear during the crystallization process that have sizes close to the nanometric range. The use of the cold drawing method led to the substructure formation in both alloys and the refinement of intermetallic particles, which ensured the significant hardening of alloy specimens. After cold drawing, the intermetallic particles were grinded and distributed along the boundaries of grains/sub-grains. The ultimate tensile strength of the Al–0.5Fe alloy was 204 MPa, while in the Al–1.7Fe alloy, it reached 295 MPa. The electrical conductivity level of the Al–0.5Fe and Al–1.7Fe alloys wire was 58.4 and 52.0 % IACS, respectively. The study showed that the Al–Fe alloys wire with ferrum concentration of up to 1.7 wt. % demonstrated thermal stability at the level of thermally-stable Al–Zr and Al–REM conductive alloys.
在电磁结晶器中铸造铝铁合金制成的金属丝的机械性能、导电性和热稳定性
新型铝基材料的开发和生产是当今工业的一项关键任务。特别是,需要新的材料来生产轻便、坚固、热稳定的家用、运输和电力领域的电线和电缆。本文介绍了电磁结晶器(EMC)连铸制备Al-0.5Fe和Al-1.7Fe合金(wt. %)的显微组织和物理力学性能的研究结果。对所研究的合金与工业合金进行了对比分析。在此分析过程中,作者利用冷拔法(CD)从初铸毛坯生产出直径为3mm的线材。显微组织分析表明,在电磁结晶器中铸造后,结晶过程中出现了亚稳改性Al2Fe相的颗粒,其尺寸接近纳米级。冷拔方法的使用导致了合金中亚组织的形成和金属间颗粒的细化,从而保证了合金试样的显著硬化。冷拔后,金属间颗粒被磨碎并沿晶粒/亚晶粒边界分布。Al-0.5Fe合金的极限抗拉强度为204 MPa, Al-1.7Fe合金的极限抗拉强度为295 MPa。Al-0.5Fe和Al-1.7Fe合金丝的电导率分别为58.4%和52.0% IACS。研究表明,当铁浓度高达1.7 wt. %时,Al-Fe合金丝的热稳定性达到热稳定的Al-Zr和Al-REM导电合金的水平。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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