Li/Sc复合添加对铸态Al-Cu-Mg铝合金微观组织和硬度的影响规律

doi:10.11896/cldb.23090211

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Abstract Al-Cu-Mg alloys have many advantages, such as excellent specific strength, processing performance and corrosion resistance, which are widely used in aerospace and other fields. However, when the alloys are in service in an environment above 250 ℃, the nanoscale precipitated phases should be coarsen rapidly, and the strengthening effect decreases significantly, which results in a serious deterioration of the alloys’ performance. In this work, took the Al-Cu-Mg alloys with Li/Sc composite addition as research materials, analyzed the as-cast microstructure, hardness and second phase of the alloys by OM, XRD, SEM, TEM and Vickers hardness tester. The results showed that with Li/Sc addition, the Al-Cu-Mg alloys changed from coarse dendrite structure to equiaxed crystal structure, the average grain size of α-Al decreases from 83.58 μm to 29.75 μm, and the refinement effect reached 64.41%. The hardness was increased from HV88.73 to HV116.70, an increase of 31.52%. The strengthening mechanism of the alloys was fine grain strengthening and second phase strengthening. There was composition segregation in the alloys. some Cu elements are enriched on the grain boundary, forming a network distribution of Al₂CuMg phase and bulk Al₂Cu phase, while in the grain there were bulk Al₆CuLi₃ quasicrystal phase, Al₃Sc phase and AlCuSc phase, and chain distribution of Al₂CuMg phase. Among them, AlCuSc phase, as a harmful phase in the alloy, consumed a part of Sc and Cu elements during nucleation, which would result in a decrease in the volume fraction of other strengthening phases to decrease the strengthening effect. The formation of this phase should be reduced.

Key words： Al-Cu-Mg alloy microscopic structure microalloying grain refinement strengthening second phase strengthening

Published: 25 December 2024 Online: 2024-12-20

CLC number:

TG146.2

Fund:Natural Science Foundation of Inner Mongolia Autonomous Region (2022FX06,2023LHMS05015),Basic Research Funds for Universities Affiliated to Inner Mongolia Autonomous Region (JY20220184,ZTY2023047),Research Program Supported by Inner Mongolia University of Technology (BS2021043),and Central Government Funds for Guiding Local Science and Technology Development (2023ZY0012).

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	Articles by authors
	FAN Hanghang
	LIU Fei
	ZHENG Yiwei
	BAI Pucun
	CUI Xiaoming
	WANG Haibo
	JIN Liang

Cite this article:

FAN Hanghang,LIU Fei,ZHENG Yiwei, et al. Effect of Li/Sc Composite Addition on Microstructure and Hardness of As-cast Al-Cu-Mg Alloys[J]. Materials Reports, 2024, 38(24): 23090211-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23090211 OR http://www.mater-rep.com/EN/Y2024/V38/I24/23090211

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