Microstructures and mechanical properties of 5083 aluminum alloy repaired by laser directed energy deposition
ZHU Hongbin1, HUA Qian2,3, LI Ruidi2,3, XU Rong2,3, LIN Zeheng2,3, NIU Pengda2,3, YUAN Tiechui2
1. CRRC Industry Research Institute,Beijing 100160, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 3. Shenzhen Research Institute, Central South University, Shenzhen 518000, China
Abstract：In this paper, the slotted 5083 aluminum-magnesium alloy was repaired by laser direction energy deposition (DED) method, in which Al-Mg-Sc-Zr alloy powders was used as the repairing material. The microstructure and mechanical properties of 5083 alloy samples before and after repairing were studied by means of metallurgical microscope, scanning electron microscope, electron backscatter diffraction, room temperature tensile test and microhardness measurement, etc. Meanwhile, the mechanical properties of samples with different repairing volumes were compared. The results show that the columnar crystals near the fusion line in the repaired area are dendritic and grow epitaxially to the matrix perpendicular to the fusion line. The repaired zone shows a typical molten pool distribution with grain size of 4-9 μm and abundant pores. A large number of Al3(Sc,Zr) particles are precipitated near the fusion line and scanning orbit. The tensile strengths of the 5083 matrix material and the grooved restorations are not much different, which are 190.80 MPa and 197.73 MPa, respectively, but the elongation of the repaired specimens is greatly reduced. In the range of 2 mm from the matrix to the repaired zone, the average hardness (HV) value increases gradually from 50 to 100.
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2022, Vol. 27 
