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Enhancement of strength and superplasticity in a 6061 Al alloy processed by equal-channel-angular-pressing

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Abstract

Pre-equal-channel-angular-pressing (ECAP) solution treatment combined with post-ECAP aging treatment has been found to be effective in enhancing the room-temperature strength of 6061 aluminum alloy. The largest increase in ultimate tensile strength (UTS) (=460 MPa) and yield stress (YS) (=425 MPa) is obtained in post-ECAP aged 6061 Al with six pressings. The strength increases by a factor of 1.4 when compared to T6 treated commercial 6061 Al. The strength of 6061 Al obtained in the present research is higher than that of ECA-pressed 6061 Al with pre-ECAP peak-aging treatment studied by other investigators. The more effective strengthening of post-ECAP low-temperature aging may be linked with the higher dislocation accumulation rate in the solutionized matrix and the presence of higher density particles in the aged matrix. Modest low-temperature (523 K) and high-temperature (813 K) superplasticity is observed in the ECAP 6061 Al, which may be a result of increased grain bundary area from grain refinement.

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Authors and Affiliations

  1. the Department of Metallurgy and Materials Science, Hong-Ik University, 121-7941, Seoul, Korea

    W. J. Kim (Professor), J. K. Kim (Student) & T. Y. Park (Student)

  2. the Department of Metallurgical Engineering, Chungnam National University, 305-764, Taejeon, Korea

    S. I. Hong (Professor)

  3. the Department of Materials Science and Engineering, Kunsan National University, 573-701, Jeollabuk-do, Korea

    D. I. Kim (Professor)

  4. the School of Metallurgical and Material Engineering, Kookmin University, 136-702, Seoul, Korea

    Y. S. Kim (Professor)

  5. the Iron & Steelmaking Research Team, Technical Research Lab., POSCO, 790-785, Pohang, Korea

    J. D. Lee (Researcher)

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  1. W. J. Kim
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  2. J. K. Kim
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Kim, W.J., Kim, J.K., Park, T.Y. et al. Enhancement of strength and superplasticity in a 6061 Al alloy processed by equal-channel-angular-pressing. Metall Mater Trans A 33, 3155–3164 (2002). https://doi.org/10.1007/s11661-002-0301-4

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  • DOI: https://doi.org/10.1007/s11661-002-0301-4

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