Effect of Li/Sc Composite Addition on Microstructure and Hardness of As-cast Al-Cu-Mg Alloys
FAN Hanghang1, LIU Fei1,2,*, ZHENG Yiwei1, BAI Pucun1, CUI Xiaoming1, WANG Haibo3, JIN Liang3
1 College of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2 Bin Zhou Bohai Piston Co., Ltd., Binzhou 256602, Shangdong, China 3 Inner Mongolia Synthetic Chemical Engineering Institute, Hohhot 010010, China
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.
范航航, 刘飞, 郑亦玮, 白朴存, 崔晓明, 王海波, 靳亮. 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[J]. 材料导报, 2024, 38(24): 23090211-7.
FAN Hanghang, LIU Fei, ZHENG Yiwei, BAI Pucun, CUI Xiaoming, WANG Haibo, JIN Liang. Effect of Li/Sc Composite Addition on Microstructure and Hardness of As-cast Al-Cu-Mg Alloys. Materials Reports, 2024, 38(24): 23090211-7.
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2024, Vol. 38 
