Microstructure and mechanical properties of A7N01 aluminum alloy weld joints filled with ER5356 and ER5087 weld wires
Abstract
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.
References
[1] I. Kovács, J. Lendvai, T. Ungar, G. Groma, J. Lakner, Mechanical properties of AlZnMg alloys, Acta Materialia, 28 (1980) 1621–1631. https://doi.org/10.1016/0001-6160(80)90015-2
[2] J. C. Williams, E. A. Starke Jr, Progress in structural materials for aerospace systems, Acta Materialia, 51 (2003) 5775–5799. https://doi.org/10.1016/j.actamat.2003.08.023
[3] T. Engdahl, V. Hansen, P. J. Warren, K. Stiller, Investigation of fine scale precipitates in Al-Zn-Mg alloys after various heat treatments, Materials Science and Engingeering A, 327 (2002) 59–64. https://doi.org/10.1016/S0921-5093(01)01876-7
[4] Q. Zhu, L. Chen, G. Zhu, X. Huo, Effect of Sc addition on low-cycle fatigue properties of extruded Al-Zn-Mg-Cu-Zr alloy, Materials Science and Technology, 36(1) (2020) 118-126. https://doi.org/10.1080/02670836.2019.1684668
[5] H. R. Zaid, A. M. Hatab, A. M. A. Ibrahim, Properties enhancement of Al-Zn-Mg alloy by retrogression and re-aging heat treatment, Journal of Mining and Metallurgy Section B:Metallurgy, 47 (1) B (2011) 31 – 35. https://doi.org/10.2298/JMMB1101031Z
[6] H. Xie, Z. Xiao, Z. Li, M. Wang, S. Ma, H. Jiang, Quench sensitivity of AA7N01 alloy used for high-speed train body structure, The Journal of The Minerals, Metals & Materials Society (TMS), 71(5) 2019 1681-1686. https://doi.org/10.1007/s11837-018-3162-z
[7] M. Pakdi, G. Çam, M. Koçak, S. Erim, Microstructural and mechanical characterization of laser beam welded AA6056 Al-alloy, Materials Science and Engineering A, 528 (2011) 7350–7356. https://doi.org/10.1016/j.msea.2011.06.010
[8] R. Kumar, U. Dilthey, D.K. Dwivedi, P.K. Ghosh, Thin sheet welding of Al 6082 alloy by AC pulse-GMA and AC wave pulse-GMA welding, Materials & Design, 30 (2009) 306-313. https://doi.org/10.1016/j.matdes.2008.04.073
[9] R. Manti, D.K. Dwivedi, A. Agarwal, Microstructure and hardness of Al-Mg-Si weldments produced by pulse GTA welding, International Journal of Advanced Manufacturing Technology, 36 (2008) 263-269. https://doi.org/10.1007/s00170-006-0849-z
[10] J. Górka, The assessment of the quality of welded joints made of abrasion-resistant plates using the nanocrystalline filler metal, Journal of Mining and Metallurgy Section B:Metallurgy, 56 (2) B (2020) 209–220. https://doi.org/10.2298/JMMB190515010G
[11] X. M. Wang, B. Li, M. X. Lia, H. G. Cui, H. Chen, Study of local-zone microstructure, strength and fracture toughness of hybrid laser-metal-inert-gas-welded A7N01 aluminum alloy joint, Materials Science and Engineering A, 688 (2017) 114–122. https://doi.org/10.1016/j.msea.2017.01.087
[12] K. Zhang, J. Q. Chen, P. Z. Ma, X. H. Zhang, Effect of welding thermal cycle on microstructural evolution of Al–Zn–Mg–Cu alloy, Materials Science and Engineering A, 717 (2018) 85-94. https://doi.org/10.1016/j.msea.2018.01.067
[13] A. K. Lakshminarayana, V. Balasubramanian, K. Elangovan, Effect of welding processes on tensile properties of AA6061 aluminium alloy joints, International Journal of Advanced Manufacturing Technology, 40 (2009) 286–296. https://doi.org/10.1007/s00170-007-1325-0
[14] I. B. Robinson, F. R. Baysinger, Welding Aluminum Alloy 7039, Welding Journal, 45 (1966) 433–444. https://doi.org/10.2351/1.5058333
[15] K. Shankar, W. D. Wu, Effect of welding and weld repair on crack propagation behaviour in aluminium alloy 5083 plates, Materials & Design, 27 (2006) 968-975. https://doi.org/10.1016/s0261-3069(01)00059-0
[16] B. Hu, I. M. Richardson, Mechanism and possible solution for transverse solidification cracking in laser welding of high strength aluminium alloys, Materials Science and Engineering A, 429 (2006) 287–294. https://doi.org/10.1016/j.msea.2006.05.040
[17] Z. H. Zhao, Z. Xu, G. S. Wang, Effect of Sc, Zr, Er in ER5356 welding wire on mechanical properties of welded joint of 7A52 aluminum alloy, Chinese Journal of Materials Research, 27 (2013) 287-291. https://doi.org/CNKI:SUN:CYJB.0.2013-03-011
[18] X. F. Lei, Y. Deng, Y. Y. Peng, Microstructure and properties of TIG/FSW welded joints of a new Al-Zn-Mg-Sc-Zr alloy, Journal of Materials Engineering and Performance, 22 (2013), 2723-2729. https://doi.org/10.1007/s11665-013-0577-0
[19] L. Fu, Y. Y. Peng, J. W. Huang, Y. Deng, Z. M. Yin, Microstructures and mechanical properties of gas tungsten arc welded joints of new Al–Mg–Sc and Al–Mg–Er alloy plates, Materials Science and Engineering A, 620 (2015) 149–154. https://doi.org/10.1016/j.msea.2014.10.014
[20] J. W. Huang, Z. M. Yin, X. F. Lei, Microstructure and properties of 7A52 Al alloy welded joint, Transactions of Nonferrous Metals Society of China, 18 (2008) 804-808. https://doi.org/10.1016/S1003-6326(08)60139-9
[21] Y. Deng, B. Peng, G. Xu, Q. Pan, R. Ye, Y. Wang, L. Lu, Z. Yin, Stress corrosion cracking of a high-strength friction-stir-welded joint of an Al-Zn-Mg-Zr alloy containing 0.25 wt% Sc, Corrosion Science, 100 (2015) 57-72. https://doi.org/10.1016/j.corsci.2015.06.031
[22] S. Kou, Y. Le, Nucleation Mechanisms and grain refining of weld metal, Welding Journal, 65 (1986) 305–313. https://doi.org/10.1007/BF02628392
[23] G. D. Janaki Ram, T. K. Mitra, V. Shankar, S. Sundaresan, Microstructural refinement through inoculation of type 7020 Al–Zn–Mg alloy welds and its effect on hot cracking and tensile properties, Journal of Materials Processing Technology, 142 (2003) 174–181. https://doi.org/10.1016/S0924-0136(03)00574-0
[24] X. Z. Li, V. Hansen, J. Gjonnes, L. R. Wallenberg, HREM study and structure modeling of the η′ phase, the hardening precipitates in commercial Al-Zn-Mg alloys, Acta Materialia, 47 (1999) 2651–2659. https://doi.org/10.1016/s1359-6454(99)00138-x
[25] X. Y. Wei, H. Huang, Z. Y. Chen, W. Wang, C. Y. Li, Z. Y. Nie, Microstructure and mechanical properties of Al-Mg-Mn-Zr-Er weld joints filled with Al-Mg-Mn-Zr and Al-Mg-Mn-Zr-Er weld wires, Journal of Rare Earths, 28 (2010) 627-630. https://doi.org/10.1016/S1002-0721(09)60168-X
[26] Z. M. Yin, Yang. L, Q. L. Pan, Effect of minor Sc and Zr on microstructures and mechanical properties of Al-Zn-Mg based alloys, The Chinese Journal of nonferrous metals, 11 (2001) 822-825. https://doi.org/CNKI:SUN:ZYSY.0.2001-06-002
[27] Y. Deng, B. Peng, G.F. Xu, Q.L. Pan, Z.M. Yin, R. Ye, Y.J. Wang, L.Y. Lu, Effects of Sc and Zr on mechanical property and microstructure of tungsten inert gas and friction stir welded aerospace high strength Al–Zn–Mg alloys, Materials Science and Engineering A, 639 (2015) 500–513. https://doi.org/10.1016/j.msea.2015.05.052
[28] F. Matsuda, Effect of additional elements on weld solidification crack susceptibility of Al–Zn–Mg alloy, Report II, Transactions of the Japan Welding Research Institute, 12 (1983) 93–102. https://doi.org/10.1007/BF01447035
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