Microstructure and process optimization of AlCrFeCoNiCu high-entropy alloy by laser deposition

被引：0
作者：
Li Y.-Z. [1 ,3 ]
Shi Y. [1 ,2 ]
机构：
[1] Colledge of Electromechanical Engineering, Changchun University of Science and Technology, Changchun
[2] National Base of International Science and Technology Cooperation in Optics, Changchun University of Science and Technology, Changchun
[3] Colledge of Electromechanical and Intellectual Technology, Jilin Vocational College of Industry and Technology, Jilin
来源：
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2019年 / 27卷 / 04期
关键词：
Aluminum alloy; High-entropy alloy; Laser deposition; Laser technology; TOPSIS;
D O I：
10.3788/OPE.20192704.0795
中图分类号：
学科分类号：
摘要：
To improve the mechanical properties of an aluminum alloy surface, high-purity Cr, Fe, Co, Ni, and Cu powders were laser deposited on the alloy by using a coaxial powder feeder to form an AlCrFeCoNiCu High-Entropy Alloy (HEA) coating. With laser power, scanning speed, and powder feeding rate selected as the factors and the wetting angle and dilution taken as the responses, a multi-objective optimization of the process parameters of laser deposition was conducted by combining the Taguchi method and the technique for order preference by similarity to an ideal solution (TOPSIS). The phase structure, microstructure, and element contents were analyzed by XRD, SEM and EDS, and the surface hardness of the coating was determined. The results of the validation experiments reveal that the relative closeness coefficient (Ci*) increased by 5.28% from 0.538 9 to 0.567 4 and that the ideal parameter values were laser power of 1 300 W, scanning speed of 120 mm/min, and powder feed rate of 5.4 g/min. During laser deposition, the HEA coating consisted of body-centered cubic and face-centered cubic phases, and the microstructure of the coating is composed of columnar and equiaxed crystals. Segregation of copper occurred in indendrites, and the average hardness of the coating is 509 HV0.2, which is five times that of the substrate. These results indicate that combination of the Taguchi method and TOPSIS can effectively optimize the process parameters of laser deposition of HEA on aluminum alloys and that AlCrFeCoNiCu HEA coating can significantly improve the mechanical properties of aluminum alloys. © 2019, Science Press. All right reserved.
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页码：795 / 806
页数：11
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