Effects of Rare Earth Er Additions on Microstructure and Mechanical Properties of an Al–Zn–Mg–Cu Alloy

  • S. Kord
  • Mohammad Alipour
  • M. H. Siadati
  • Masumeh Kord
  • Praveennath G. Koppad
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The effects of Er additions on the microstructure and tensile properties of cast Al–15Zn–2.5Mg–2.5Cu aluminum alloy have been investigated. The results show that by adding 1 wt% Er grain refiner in the cast alloy, the grains can be refined to a fine degree. The microstructures and fracture surfaces of cast aluminum alloy samples were examined by SEM. In addition, the Er modified the eutectic structure from a coarse plate-like and acicular structure to a fine branched and fibrous one. The tensile properties were improved by the addition of Er, and good ultimate tensile strength (325 MPa) but poor elongation (6%) were obtained when the Er addition was 1 wt%. Furthermore, fractographic examinations revealed that refined pore and spheroidized a-Al dendrite were responsible for the high ultimate tensile strength. At higher magnifications, unrefined specimens showed cracking along the grains, whereas Er-refined specimens showed cracks in individual intermetallic compounds.

Keywords

Rare earth Heat treatments Mechanical properties Microstructure 

References

  1. 1.
    J. Hirsch, Aluminium in innovative light-weight car design, Mater. Trans. 52 (2011) 818–824.Google Scholar
  2. 2.
    T. Dursun, C. Soutis, Recent developments in advanced aircraft aluminium alloys, Mater. Des. 56 (2014) 862–871.Google Scholar
  3. 3.
    A. Haghparast, M. Nourimotlagh, M. Alipour, Effect of the strain-induced melt activation (SIMA) process on the tensile properties of a new developed super high strength aluminum alloy modified by Al-5Ti-1B grain refiner, Mater. Charac. 71 (2012) 6–18.Google Scholar
  4. 4.
    M. Alipour, M. Emamy, Effects of Al–5Ti–1B on the structure and hardness of a super high strength aluminum alloy produced by strain-induced melt activation process, Mater. Des. 32 (2011) 4485–4492.Google Scholar
  5. 5.
    M. Alipour, M. Emamy, R. E. Farsani, M. H. Siadati, H. Khorsand, Effects of a modified SIMA process on the structure, hardness and mechanical properties of Al-12Zn-3 Mg-2.5Cu alloy, Iranian Journal of Materials Science and Engineering. 12 (2015) 77–88.Google Scholar
  6. 6.
    M. Alipour, B. G. Aghdam, H. E. Rahnoma, M. Emamy, Investigation of the effect of Al–5Ti–1B grain refiner on dry sliding wear behavior of an Al–Zn–Mg–Cu alloy formed by strain-induced melt activation process, Mater. Des. 46 (2013) 766–775.Google Scholar
  7. 7.
    M. Alipour, M. Emamy, S. H. S. Ebrahimi, M. Azarbarmas, M. Karamouz, J. Rassizadehghani, Effects of pre-deformation and heat treatment conditions in the SIMA process on properties of an Al-Zn-Mg-Cu alloy modified by Al-8B grain refiner, Materials Science and Engineering A. 528 (2011) 4482–4490.Google Scholar
  8. 8.
    M. Alipour, M. Emamy, M. Azarbarmas, M. karamouz, Effects of Al-5Ti-1B master alloy on the microstructural evaluation of a highly alloyed aluminum alloy produced by SIMA process, AIP Conference Proceedings 1252 (2010) 1060–1072.Google Scholar
  9. 9.
    M. Alipour, M. Emamy, J. Rasizadeh, M. Karamouz, M. Azarbarmas, Effects of Al-8B grain refiner on the structure, hardness and tensile properties of a new developed super high strength aluminum alloy, TMS Annual Meeting, 2 (2011) 309–320.Google Scholar
  10. 10.
    G. S. Pradeep Kumar, P. G. Koppad, R. Keshavamurthy, M. Alipour, Microstructure and mechanical behaviour of in situ fabricated AA6061–TiC metal matrix composites, Archives of Civil and Mechanical Engineering, 17 (2017) 535–544.Google Scholar
  11. 11.
    M. Alipour, M. Emamy, J. Rasizadeh, M. Karamouz, M. Azarbarmas, Effects of Al-5Ti-1B grain refiner on the structure, hardness and tensile properties of a new developed super high strength aluminum alloy, TMS Annual Meeting, 3 (2011) 833–842.Google Scholar
  12. 12.
    Alipour, M, Azarbarmas, M, Heydari, F, Hoghoughi, M, Alidoost, M, Emamy, M.”The effect of Al-8B grain refiner and heat treatment conditions on the microstructure, mechanical properties and dry sliding wear behavior of an Al-12Zn-3 Mg-2.5Cu aluminum alloy” Materials and Design, Volume 38, June 2012, Pages 64–73.Google Scholar
  13. 13.
    Mirjavadi, S. S, Alipour, M, Hamouda, A. M. S, Besharati Givi, M. K, Emamy, M.” Investigation of the effect of Al-8B master alloy and strain-induced melt activation process on dry sliding wear behavior of an Al-Zn-Mg-Cu alloy” Materials and Design, Volume 53, January 2014, Pages 308–316.Google Scholar
  14. 14.
    AFSHARI, B. M, MIRJAVADI, S. S, DOLATABAD, Y. A, AGHAJANI, M, GIVI, M. K. B, ALIPOUR, M, EMAMY, M.” Effects of pre-deformation on microstructure and tensile properties of Al—Zn—Mg—Cu alloy produced by modified strain induced melt activation” Transactions of Nonferrous Metals Society of China (English Edition), Volume 26, Issue 9, September 2016, Pages 2283–2295.Google Scholar
  15. 15.
    Alipour, M, Mirjavadi, S, Besharati Givi, M. K, Razmi, H, Emamy, M, Rassizadehghani, J.” Effects of Al-5Ti-1B master alloy and heat treatment on the microstructure and dry sliding wear behavior of an Al-12Zn-3 Mg-2.5Cu alloy” Iranian Journal of Materials Science and Engineering, Volume 9, Issue 4, 2012, Pages 8–16.Google Scholar
  16. 16.
    Alipour, M., Emamy, M., Rasizadeh, J., Azarbarmas, M., Karamouz, M.” Effect of predeformation and heat treatment conditions in the modified SIMA process on microstructural of a new developed super high-strength aluminum alloy modified by A1-8B grain refiner” TMS Annual Meeting, Volume 3, 2011, Pages 843–853.Google Scholar
  17. 17.
    Alipour, M., Emamy, M., Rasizadeh, J., Karamouz, M., Azarbarmas, M.” Effects of Al-8B grain refiner on the structure, hardness and tensile properties of a new developed super high strength aluminum alloy, TMS Annual Meeting, Volume 2, 2011, Pages 309–320.Google Scholar
  18. 18.
    B. Binesh, M. Aghaie-Khafri, RUE-based semi-solid processing: Microstructure evolution and effective parameters, Materials & Design, Volume 95, 2016, Pages 268–286.Google Scholar
  19. 19.
    B. Binesh, M. Aghaie-Khafri, Microstructure and texture characterization of 7075 Al alloy during the SIMA process, Materials Characterization, Volume 106, 2015, Pages 390–403.Google Scholar
  20. 20.
    J. Buha, R. N. Lumley, A. G. Crosky, Secondary ageing in an aluminium alloy 7050, Mater. Sci. Eng. A 492 (2008) 1.Google Scholar
  21. 21.
    C. Mondal, A. K. Mukhopadhyay, T. Raghu, V. K. Varma, Tensile properties of peak aged 7055 aluminum alloy extrusions, Mater. Sci. Eng. A 454 (2007) 673.Google Scholar

Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • S. Kord
    • 1
    • 2
  • Mohammad Alipour
    • 1
    • 3
  • M. H. Siadati
    • 1
  • Masumeh Kord
    • 2
  • Praveennath G. Koppad
    • 4
  1. 1.Faculty of Materials Science and EngineeringK. N. Toosi University of TechnologyTehranIran
  2. 2.Department of BiomaterialPasteur Institute of IranTehranIran
  3. 3.Department of Materials Science and EngineeringUniversity of TabrizTabrizIran
  4. 4.Department of Mechanical EngineeringNagarjuna College of Engineering and TechnologyBangaloreIndia

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