Microstructure and mechanical properties of A7N01 aluminum alloy weld joints filled with ER5356 and ER5087 weld wires

• Published in: Journal of mining and metallurgy. Section B, Metallurgy Vol. 58; no. 1; pp. 157 - 167
• Main Authors: Xie, H., Hu, L., Ma, Q.-H., Meng, W., Yin, X.-H.
• Format: Journal Article
• Language: English
• Published: Bor Technical Faculty Bor, University of Belgrade 2022; Technical Faculty, Bor
• Subjects: Alloys; Aluminum alloys; Aluminum base alloys; Electron backscatter diffraction; Elongation; er5087 welding wire; er5356 welding wire; Gas metal arc welding; Hardness measurement; High speed rail; Mechanical properties; Metal plates; Microhardness; Microstructure; Nucleation; Spectrum analysis; Tensile strength; Tensile tests; Transmission electron microscopy; Welded joints; Welding wire; Yield stress; Zirconium
• ISSN: 1450-5339; 2217-7175
• DOI: 10.2298/JMMB210625056X

The A7N01-T5 aluminum alloy plates with the thickness of 12 mm were welded with the ER5356 and ER5087 welding wires, respectively, by the method of Metal Inert Gas (MIG) welding. The mechanical properties and microstructures of the welded joints were investigated by micro-hardness measurement, tensile test, energy dispersive spectroscopy (EDS), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). The results showed that the tensile strength and elongation of 7N01/5087 welded joint (the 7N01 aluminum alloy plate welded with ER5087 wire) were greater than those of 7N01/5356 welded joint (the 7N01 aluminum alloy plate welded with ER5356 wires), respectively. The high strength and the good elongation of 7N01/5087 welded joint were mainly attributed to the microstructure refinement in the weld zone through adding Zr element to promote the nucleation of Al grains around the Al3Zr sites.