Scandium Influence on the Structure and Chemical Inhomogeneity of Welded Joints of Al-Zn-Mg-Cu System Alloys

Abstract:

Structural transformations and formation of chemical inhomogeneity in the weld and HAZ metal in fusion welding of complex alloy of V96 type were studied. It is shown that under the influence of welding heat, partial melting of the alloy phase components proceeds in the heat-affected zone with formation of structures of eutectic origin in the form of extended interlayers along the grain boundaries, causing metal embrittlement. Scandium addition to the alloy enables reducing the solidification processes and degree of segregation along the grain boundaries, as well as localizing partial melting of the grains without formation of coarse eutectic interlayers.

• Periodical: Applied Mechanics and Materials (Volume 682)
• Pages: 464-468
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.682.464
• Online since: October 2014
• Authors: Viktor Fedorchuk*, Iuriu Falchenko
• Keywords: Aluminium Alloy, Chemical Inhomogeneity, Heat-Affected Zone, Scandium, Structural, Weld Metal, Weldability

References

[1] Alieva S.G., Altman M.B., Ambartsumyan S. M, et al. Commercial aluminium alloys – Refer. Edition. – M.: Metallurgia, 1984 – 528 p.

[2] Bratukhin A.G., Polkin I.S., Kachanov E.B. New structural weldable alloys for aviation and national economy / Vestnik Know-How. – 1993. #2. – P. 49-51.

[3] Illarionov E.I., Kolobnev N.I., Gorbunov P.Z. Aluminium alloys in aerospace engineering. M.: Nauka, 2001. – 192 p.

[4] Fridlyander I.N. Aluminium alloys in flying vehicles in the periods between 1970-1999 and 2000-2015. / Transactions of Vth session of Scientific Council on advanced materials MAAS Problemi sovremennogo materialovedenia,. Kiev: Nauk. Dumka, 2000. – pp.15-19.

[5] Ishchenko A. Ya., Fedorchuk V.E., Poklyatskii A.G., Yavorska M.R. Hot cracking resistance in welding of experimental alloys of Al-Zn-Mg-Cu system / Paton Welding Journal, #2, 2007 p.

[6] Mashin V.S., Poklyatskii A.G., Fedorchuk V.E. Mechanical properties of aluminium alloy joints in consumable and nonconsumable electrode welding / Paton Welding Journal. – 2005. - #9. – P. 43-49.

[7] Ishchenko A. Ya., Labur T.M., Bernatskii V.N., Makovetskaya O.K. Aluminium and its alloys in modern welded structures. K.: Ekotekhnologiya, 2006. – 112 p.

[8] Zasypkin V.A., Leshkov V.P., Ruchjeva N.V., et al. Influence of the structure and properties of ingots on the quality of V95 alloy plates / MiTOM, #7, 1983, pp.16-19.

[9] Reference book on aluminium alloys. Ed. V.I. Elagin. – M.: VILS. – 1978. – 132 p.