线弧定向能沉积 Al-Ce-Mg 合金的高温力学性能

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-10-29 DOI:10.1016/j.jallcom.2024.177304
Chan Wang, Feifan Wang, Haozhe Xu, Jinlong Hu, Xinglong Di, Changmeng Liu, Yueling Guo
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引用次数: 0

摘要

通过线弧定向能沉积(WA-DED)技术制备了 Al-15Ce-3Mg (wt.%) 合金,并研究了其高温力学性能,以促进 Al-Ce-Mg 合金的发展。WA-DED Al-15Ce-3Mg 合金形成了高共晶微观结构,主要包括大的原生 Al11Ce3 金属间化合物和细小的 Al11Ce3/α-Al 共晶。在沉淀强化和固溶强化的共同作用下,WA-DED Al-15Ce-3Mg 合金在高温下具有高强度和良好的塑性变形能力。在 220~300 ℃条件下,其抗拉强度可达 86~132 MPa,与 LPBF 成形和 HIP 处理的 Al-15Ce-9Mg 合金相近。而 WA-DED Al-15Ce-3Mg 的伸长率明显更高,达到 12.9%~29% 。在拉伸过程中,由于基体在高温下发生软化,会出现明显的应变软化。此外,WA-DED Al-15Ce-3Mg 合金还表现出良好的高温抗压强度,在抗压应变为 30% 时,220 ℃ 时为 360 兆帕,250 ℃ 时为 310 兆帕,300 ℃ 时为 240 兆帕。在高温蠕变性能方面,WA-DED Al-15Ce-3Mg 合金与 Al-3Mg 合金相比,在相似温度下具有更高的抗蠕变性,并且随着温度和应力的增加,其蠕变应变累积更快。在 220 ℃、250 ℃ 和 300 ℃ 下,位错蠕变是主要的蠕变变形机制。在 220 ℃ 和 250 ℃ 时,由晶格自扩散控制的位错爬升主导蠕变变形,而在 300 ℃ 时,位错滑行是蠕变的控制机制。这项研究表明,WA-DED 是制造具有良好强度和延展性的 Al-Ce-Mg 合金的一种有吸引力的方法。
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High temperature mechanical properties of wire-arc directed energy deposited Al-Ce-Mg alloy
The Al-15Ce-3Mg (wt.%) alloy was fabricated by wire-arc based directed energy deposition (WA-DED), and its high temperature mechanical properties were investigated to facilitate the development of Al-Ce-Mg alloys. The WA-DED Al-15Ce-3Mg alloy forms hypereutectic microstructure, which mainly includes large primary Al11Ce3 intermetallics and fine Al11Ce3/α-Al eutectics. The WA-DED Al-15Ce-3Mg alloy has high strength and good plastic deformation ability at high temperatures, under the combined effects of precipitation strengthening and solid solution strengthening. Its tensile strength can reach 86~132 MPa at 220~300 ℃, which is similar to that of LPBF-formed and HIP-treated Al-15Ce-9Mg alloy. While the elongation of WA-DED Al-15Ce-3Mg is significantly higher, reaching 12.9%~29%. Significant strain softening occurs during the tensile process due to matrix softening at elevated temperatures. Moreover, WA-DED Al-15Ce-3Mg alloy also shows good high temperature compressive strength, which is 360 MPa at 220 ℃, 310 MPa at 250 ℃ and 240 MPa at 300 ℃ at the compressive strain of 30%. For the high temperature creep properties, WA-DED Al-15Ce-3Mg alloy displays higher creep resistance compared to Al-3Mg alloy at similar temperature, and its creep strain accumulates faster as the temperature and stress increase. The dislocation creep are the main creep deformation mechanisms at 220 ℃, 250 ℃ and 300 ℃. The dislocation climb controlled by lattice self-diffusion dominates creep deformation at 220 ℃ and 250 ℃, while the dislocation glide is the controlling mechanism for creep at 300 ℃. This study demonstrates that WA-DED is an attractive method for fabricating Al-Ce-Mg alloys with a good combination of strength and ductility.
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来源期刊
Journal of Alloys and Compounds
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.
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