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Structural Properties Evaluation of Semisolid Extruded Al–Cu–Mg Powder Metallurgy Alloys

  • Katti BharathEmail author
  • Asit Kumar Khanra
  • M. J. Davidson
Technical Paper
  • 14 Downloads

Abstract

Structural properties evaluation of semisolid extruded Al–4Cu–xMg alloy preforms have been performed in the present investigation. Pressureless sintering of Al–4 wt% Cu with varying Mg (0, 0.25, 0.5, 0.75 and 1 wt%) powder mixture was performed in an inert atmosphere. The sintering behavior and mechanical properties of all alloys were investigated at different temperatures and compositions, respectively. The maximum density and hardness (647 MPa) were found in the Al–4Cu–0.5 Mg composition sintered at 550 °C. Semisolid extrusion was carried out on sintered Al–4Cu–0.5 Mg alloys having an Initial Relative Density of 80% and 90% to find the structure–property correlation due to deformation. Extrusion was carried out in between solidus (542.7 °C) and liquidus (662.8 °C) temperatures with different solid fractions, which were derived from the TG/DTA analysis. All experiments were performed with low extrusion ratio of 1.44, strain rate of 0.1 s−1 and die approach angle of 30°. Structure–property correlation study of extruded rod was performed at front end, middle part and rear end to understand the temperature and metal flow profiles during deformation process. There were no visible defects found in the demarcated samples. The presence of Al2Cu precipitate in the extruded alloy was identified by X-Ray diffractometer and scanning electron microscope with energy dispersive spectroscopy analysis. The microstructural evolution was observed in all the extruded bars by optical microscope. Micro-hardness of extruded samples was found to be 1001 MPa, which was almost two times of sintered sample.

Keywords

Powder metallurgy Initial relative density Semisolid extrusion Densification and hardness 

Notes

Acknowledgements

The authors would like to thank the Director of National Institute of Technology-Warangal, faculty members and laboratory staff of Metallurgical and Materials Engineering Department for their support throughout the completion of this work.

References

  1. 1.
    RamaKrishnan P, Adv Powder Metall 1 (2013) 493.CrossRefGoogle Scholar
  2. 2.
    Pickens J R, J Mater Sci 16 (1981) 1437.CrossRefGoogle Scholar
  3. 3.
    Barbaux Y, and Pons G, J Phys IV Colloq 3 (1993) 191.Google Scholar
  4. 4.
    Lavernia E J, Ayers J D, and Srivastan T S, Int Mater Rev 37 (1992) 1.CrossRefGoogle Scholar
  5. 5.
    Jones H, in High Performance Materials in Aerospace, (ed) Flower H M, Chapman & Hall, London (1995).Google Scholar
  6. 6.
    Virdis M R, and Pershing J, Energy to 2050 Scenarios for a Sustainable Future, International Energy Agency (2003).Google Scholar
  7. 7.
    Kelley G, Joining of Carbon Fibre Reinforced Plastics for Automotive Applications, Ph.D. Thesis, Departemnt of Aeronautical & Vehicle Engineering, Royal Institute of Technology (2004).Google Scholar
  8. 8.
    Choi Y, Yeo H T, Park J H, Oh G H, and Park S W, J Mater Proc Technol 187 (2007) 85.Google Scholar
  9. 9.
    Bhagat R B, ASM Int 7 (1998) 840.Google Scholar
  10. 10.
    Pickens J R, ASM Int 2 (1990) 200.Google Scholar
  11. 11.
    Boland C D, Hexemer Jr R L, Donaldson I W, and Bishop D P, Mater Sci Eng A 559 (2013) 902.CrossRefGoogle Scholar
  12. 12.
    Eksi A, Velti G, Petzoldt F, Lipp K, and Sonsino C M, Powder Metall 47 (2004) 60.CrossRefGoogle Scholar
  13. 13.
    LaDelpha A D P, Mosher M P, Caley W F, Kipouros G J, and Bishop D P, Mater Sci Eng A 479 (2008) 1.CrossRefGoogle Scholar
  14. 14.
    Grayson G N, Schaffer G B, and Griffiths J R, Mater Sci Eng A 434 (2006) 1.CrossRefGoogle Scholar
  15. 15.
    Grayson G N, Schaffer G B, and Griffiths J R, Mater Sci Eng A 454455 (2007) 99.CrossRefGoogle Scholar
  16. 16.
    Delgado M L, Ruiz-Navas E M, Gordo E, and Torralba J M, J Mater Proc Technol 162163 (2005) 280.CrossRefGoogle Scholar
  17. 17.
    Schubert Th, Weißgarber T, Kieback B, Balzer H, Neubing H C, Baum U, and Braun R, in Conference Proceedings Powder Metallurgy World Congress and Exhibition (2004), p 627.Google Scholar
  18. 18.
    Hirosawa S, Sato T, Kamio A, and Flower H M, Acta Mater 48 (2000) 1797.CrossRefGoogle Scholar
  19. 19.
    Bishop D P, Cahoon J R, Chaturvedi M C, Kipouros G J, and Caley W F, Mater Sci Eng A 290 (2000) 16.CrossRefGoogle Scholar
  20. 20.
    Gökce A, Findik F, and Ali O K, Mater Charact 62 (2011) 730.CrossRefGoogle Scholar
  21. 21.
    Shashikanth C H, and Davidson M J, Mater High Temp 32 (2015) 541.CrossRefGoogle Scholar
  22. 22.
    Polmear I J, Light Alloys-Metallurgy of the Light Metals, Halsted Press, London (1996).Google Scholar
  23. 23.
    Hatch J E, (ed) Aluminium Properties and Physical Metallurgy. ASM International, Materials Park, OH (1984).Google Scholar
  24. 24.
    Kiuchi K, Sugiyama S, and Kiuchi M, (ed) Third International Conference on ‘Semi-solid Processing of Alloys and Composites. Institute of Industrial Science, University of Tokyo, Tokyo (1994).Google Scholar
  25. 25.
    Shashikanth C H, and Davidson M J, Mater High Temp 31 (2014) 274.CrossRefGoogle Scholar
  26. 26.
    Rovira M M, Lancini B C, and Robert M H, J Mater Process Technol 9293 (1999) 42.CrossRefGoogle Scholar
  27. 27.
    Birol Y, Guven E A, and Capan L J, Mater Sci Technol (2011) 1.Google Scholar
  28. 28.
    Heard D W, Donaldson I W, and Bishop D P, J Mater Process Technol 209 (2009) 5902.CrossRefGoogle Scholar
  29. 29.
    Schaffer G B, Sercombe T B, and Lumley R N, Mater Chem Phys 67 (2001) 85.CrossRefGoogle Scholar
  30. 30.
    Salleh M S, Omar M Z, Syarif J, Mohammed M N, and Alhawari K S, J Math Comput Simul 7 (2013) 286.Google Scholar

Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.Department of Metallurgical and Materials EngineeringNIT WarangalWarangalIndia
  2. 2.Department of Mechanical EngineeringNIT WarangalWarangalIndia

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