Effect of Mg and Li content on the precipitation behavior, mechanical properties and corrosion resistance of cast Al-Li-Mg-Cu alloys

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-06 DOI:10.1016/j.jallcom.2025.184208

Wenyuan Wang, Zepeng Zha, Shuai Zhang, Dongshen Huo, Guoying Sui, Chao Chen, Zhenqiang Wang

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引用次数: 0

Abstract

This study investigates the microstructure evolution, precipitation, mechanical properties, and corrosion resistance of two cast Al-Li-Mg-Cu alloys (1.3Li-4.8Mg and 1.8Li-6.6Mg) during artificial aging at 160 ºC. Simultaneous increases in Mg and Li contents significantly refine the as-cast structure and influence element segregation at grain boundaries. The 1.8Li-6.6Mg alloy demonstrates enhanced precipitation of δ′ (Al₃Li) and β (Al₃Mg₂) phases, leading to superior hardness and strength but reduced ductility due to widened precipitate-free zones and grain boundary precipitation. Conversely, the 1.3Li-4.8Mg alloy features competitive precipitation of T₁ (Al₂CuLi) and S′ (Al₂CuMg) phases, enhancing strength during peak aging but reducing corrosion resistance due to preferential anodic dissolution. The study highlights composition-dependent corrosion mechanisms, driven by potential gradients and phase distribution, offering valuable guidance for optimizing Al-Li-Mg-Cu alloys for aerospace and structural applications.

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Mg和Li含量对铸造Al-Li-Mg-Cu合金析出行为、力学性能和耐蚀性的影响

研究了两种铸态Al-Li-Mg-Cu合金（1.3Li-4.8Mg和1.8Li-6.6Mg）在160℃人工时效过程中的组织演变、析出、力学性能和耐蚀性。Mg和Li含量的同时增加显著细化铸态组织，影响晶界元素偏析。1.8Li-6.6Mg合金δ′（Al3Li）和β (Al3Mg2)相析出增强，硬度和强度提高，但由于无析出区扩大和晶界析出，塑性降低。相反，1.3Li-4.8Mg合金具有T1 （Al2CuLi）和S’（Al2CuMg）相的竞争性析出，在峰值时效过程中增强了强度，但由于优先阳极溶解而降低了耐蚀性。该研究强调了由电位梯度和相分布驱动的成分依赖腐蚀机制，为优化航空航天和结构应用的Al-Li-Mg-Cu合金提供了有价值的指导。

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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.