新型Al-Ce-Sc合金拉丝组织与性能的优化

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-04-25 DOI:10.1016/j.jallcom.2025.180623

Jinrong Xiao , Jieyun Ye , Peilong Li , Shiqi Jiang , Fusheng Zhu , Zhigang Wang

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引用次数: 0

摘要

目前铝合金导体在导电性、耐热性、强度等方面还存在无法同时解决的矛盾，不能满足大容量输电线路的要求。采用挤压和拉伸法制备了添加Ce和Sc元素的Al-RE合金线材。研究了Ce和Sc复合添加对工业纯铝合金组织、力学性能、电导率和耐热性的影响。结果表明：复合添加0.1% wt.% Ce和0.2 wt.% Sc的合金晶粒细化效果较好，平均晶粒尺寸为7.2 μm；Al-0.1Ce-0.2Sc合金丝的综合性能最好，UTS为218.9 MPa， YS为215.6 MPa， EL为5.1%，电导率（EC）为60.68% IACS。在热挤压和拉伸过程中析出的细相干纳米al3sc相具有优异的强化效果和较高的热稳定性，可显著提高合金的强度和耐热性。元素Ce的加入导致Al13Fe3Ce和AlCeSiFe相的形成，显著降低了铝基体中Fe和Si原子的浓度，从而降低了电子的散射，提高了合金的EC。在230℃× 1 h的高温条件下，Al-0.1Ce-0.2Sc合金丝的残余抗拉强度高达96.8%，并对几种合金的阻尼性能进行了评价，其中Al-0.1Ce-0.2Sc合金丝具有优异的高温阻尼性能，内耗散值可达0.25。Al-0.1Ce-0.2Sc合金导体同时具有高强度、高导电性、高耐热性和高阻尼性，为后续设计强度和导电性兼备的耐热铝导体材料提供了数据参考。

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Optimization of microstructure and properties of new Al-Ce-Sc alloy wires in drawn state

The current aluminum alloy conductor still has contradictions in conductivity, heat resistance, and strength that cannot be resolved simultaneously, and it cannot meet the requirements of large-capacity transmission lines. In this work, Al-RE alloy wires with a composite addition of Ce and Sc elements were prepared by extrusion and drawing. The effects of the composite addition of Ce and Sc on the microstructure, mechanical properties, electrical conductivity, and heat resistance of industrial pure aluminum alloys were studied. Results show that the grain refinement of the alloy with a compound addition of 0.1 wt% Ce and 0.2 wt% Sc was better, with an average grain size of 7.2 μm. The comprehensive performance of Al-0.1Ce-0.2Sc alloy wire is the best, with UTS of 218.9 MPa, YS of 215.6 MPa, EL of 5.1 %, and electrical conductivity (EC) of 60.68 % IACS. The fine coherent nano-Al₃Sc phases precipitated during hot extrusion and drawing have excellent strengthening effects and high thermal stability, which can significantly enhance the strength and heat resistance of the alloy. The addition of the element Ce results in the formation of the phases Al₁₃Fe₃Ce and AlCeSiFe, which significantly reduces the concentration of Fe and Si atoms in the aluminum matrix, thereby reducing the scattering of electrons and increasing the EC of the alloy. The Al-0.1Ce-0.2Sc alloy wire showed a tensile strength residual of up to 96.8 % after a heat resistance test at 230°C × 1 h. The damping properties of several alloys were also evaluated, among which the Al-0.1Ce-0.2Sc alloy wire has excellent high-temperature damping properties with an internal dissipation value of up to 0.25. The Al-0.1Ce-0.2Sc alloy conductor simultaneously possesses high-strength, high-conductivity, high-heat-resistance, and high-damping properties, which provides a data reference for the subsequent design of heat-resistant aluminum conductor materials with both strength and conductivity.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.