Effects of T5 Treatment on the Microstructure and Mechanical Properties of Mg-8Al-2Li Alloy

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  • Wang P. C.
    Department of Materials Science and Engineering, National Taiwan University
  • Lin H. C.
    Department of Materials Science and Engineering, National Taiwan University
  • Lin K. M.
    Department of Materials Science and Engineering, Feng Chia University
  • Lin M. C.
    Department of Materials Science and Engineering, National Taiwan University
  • Yeh M. T.
    Amli Co. Ltd.
  • Lin C. Y.
    Department of Environmental Engineering and Science, Feng Chia University

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Abstract

In this study, the effects of T5 treatment on the microstructure and mechanical properties of Mg-8Al-2Li specimens are investigated. The experimental results show the T5-treated Mg-8Al-2Li specimens will produce the β-Mg17Al12 and/or AlLi precipitates depending on the aging temperatures. The T5-treated Mg-8Al-2Li specimens will display an obvious precipitation strengthening, regardless of whether the precipitates are single β-Mg17Al12 phase or dual phases of AlLi and Mg17Al12. Their maximum tensile strengths can reach 355–375 MPa, which are 12–18% increment compared with that of the as-extruded specimen. Meanwhile, the T5-treated Mg-8Al-2Li specimens can still show good ductility with ∼9% elongation for specimens with their maximum strengths.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 52 (7), 1363-1368, 2011

    The Japan Institute of Metals and Materials

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