Metallurgical and Materials Transactions A

, Volume 49, Issue 6, pp 2463–2470 | Cite as

Improvement of Strength and Energy Absorption Properties of Porous Aluminum Alloy with Aligned Unidirectional Pores Using Equal-Channel Angular Extrusion

  • Tomonori Yoshida
  • Daiki Muto
  • Tomoya Tamai
  • Shinsuke Suzuki


Porous aluminum alloy with aligned unidirectional pores was fabricated by dipping A1050 tubes into A6061 semi-solid slurry. The porous aluminum alloy was processed through Equal-channel Angular Extrusion (ECAE) while preventing cracking and maintaining both the pore size and porosity by setting the insert material and loading back pressure. The specific compressive yield strength of the sample aged after 13 passes of ECAE was approximately 2.5 times higher than that of the solid-solutionized sample without ECAE. Both the energy absorption EV and energy absorption efficiency ηV after four passes of ECAE were approximately 1.2 times higher than that of the solid-solutionized sample without ECAE. The specific yield strength was improved via work hardening and precipitation following dynamic aging during ECAE. EV was improved by the application of high compressive stress at the beginning of the compression owing to work hardening via ECAE. ηV was improved by a steep increase of stress at low compressive strain and by a gradual increase of stress in the range up to 50 pct of compressive strain. The gradual increase of stress was caused by continuous shear fracture in the metallic part, which was due to the high dislocation density and existence of unidirectional pores parallel to the compressive direction in the structure.



The A6061 billets used in this study were provided by UACJ Corporation. This study was carried out with the support of Grant-in-Aid from The Light Metal Educational Foundation, Inc., Hitachi Metals-Materials Science Foundation, Suzuki Foundation, and Kimura Foundry Co. Ltd.


  1. 1.
    Banhart, J: Prog. Mater. Sci., 2001, vol. 46, pp. 559-632.CrossRefGoogle Scholar
  2. 2.
    Technical Committee ISO/TC 164: ISO 13314 Mechanical testing of metals, The International Organization for Standardization, Geneva.Google Scholar
  3. 3.
    Knott, J. F. Mater. Sci. Eng., 1971, vol. 7, pp. 1-36.CrossRefGoogle Scholar
  4. 4.
    Nakajima, H.: Prog. Mater. Sci., 2007, vol. 52, pp. 1091-1173.CrossRefGoogle Scholar
  5. 5.
    Hyun, S. K., Murakami, K. and Nakajima, H.: Mater. Sci., Eng. A, 2001, vol. 299, pp. 241-248.CrossRefGoogle Scholar
  6. 6.
    Segal, V. M., Reznikov, V. I., Drobyshevskiy, A. E. and Kopylov, V. I.: Russ. Metall., 1981, vol. 1, pp. 99-105.Google Scholar
  7. 7.
    Suzuki, S., Utsunomiya, H., Nakajima, H.: Mater. Sci. Eng. A, 2008, vol. 490, pp. 465-470.CrossRefGoogle Scholar
  8. 8.
    Suganuma, K., Hayashida, T., Yuasa, T. and Suzuki, S.: Key Eng. Mater., 2014, vol. 622-623, pp. 148-154.CrossRefGoogle Scholar
  9. 9.
    Ichikawa, J., Suzuki, S., Hayashida, T., Yahara, R. and Nakae, H.: Mater. Trans., 2012, vol. 53, pp. 1790–1794.CrossRefGoogle Scholar
  10. 10.
    Japan Aluminum Association: Aluminum Hand Book, seventh ed, Japan Aluminum Association, Tokyo, 2007, pp. 32.Google Scholar
  11. 11.
    T. Motegi, N. Ogawa, K. Kondo, C. Liu, and S. Aoyama: Proc. 6th Int. Conf. on Aluminum Alloys 1, Toyohashi, Japan, 1998, pp. 297–302.Google Scholar
  12. 12.
    Hayashida, T., Suzuki, S., Ichikawa, J. and Toyoyama, R.: Mater. Trans., 2013, vol. 54, pp. 2102–2108.CrossRefGoogle Scholar
  13. 13.
    Furukawa, M., Iwahashi, Y., Horita, Z., Nemoto, M. and Langdon, T. G.: Mater. Sci. Eng. A, 1998, vol. 257, pp. 328–332.CrossRefGoogle Scholar
  14. 14.
    Kim, W. J., Kim, J. K., Park, T. Y., Hong, S. I., Kim, D. I., Kim, Y. S., and Lee, J. D.: Metall. Mater. Trans. A, 2002, vol. 33, pp. 3155–3164.CrossRefGoogle Scholar
  15. 15.
    Liu, Q., Jansen, D. J. and Hansen, N.: Acta Mater., 1998, vol. 46, pp. 5819–5838.CrossRefGoogle Scholar
  16. 16.
    Iwahashi, Y., Wang, J., Horita, Z., Nemoto, M. and Langdon, T. G.: Scripta Mater., 1996, vol. 35, pp. 143–146.CrossRefGoogle Scholar
  17. 17.
    Kim, W. J. and Wang, J. Y.: Mater. Sci. Eng. A, 2007, vol.464, pp. 23–27.CrossRefGoogle Scholar
  18. 18.
    Song, Y. H., Tane, M. and Nakajima, H.: Scripta Mater., 2011, vol. 64, pp. 797–800.CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Tomonori Yoshida
    • 1
  • Daiki Muto
    • 1
  • Tomoya Tamai
    • 1
  • Shinsuke Suzuki
    • 1
    • 2
  1. 1.Department of Applied Mechanics, Faculty of Science and EngineeringWaseda UniversityTokyoJapan
  2. 2.Kagami Memorial Research Institute of Materials Science and TechnologyTokyoJapan

Personalised recommendations