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Evolution and Growth Kinetics of θ Precipitates in Naturally Aged MgLiAlZn Alloy Studied by In Situ Small-Angle X-ray Scattering

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Abstract

The MgLiAlZn (LAZ1110) magnesium alloy was studied by in situ small-angle X-ray scattering (SAXS) to reveal the evolution of MgLi2Al θ precipitates (ppts) in the early aging stage at room temperature (RT). DSC and XRD measurements reveal θ ppts in naturally aged alloy. During 0 to 22 hours of early aging at RT, the growth and coarsening of plate-like θ nano-ppts are quantitatively resolved using SAXS in terms of the temporal evolution of the radius, thickness, and relative volume fraction. In this early aging period, the radius of θ ppts grows gradually from 3.1 to 6.9 nm with a nearly constant thickness of 3.7 nm. The relative volume fraction of θ ppts increases rapidly in the early aging stage and then more slowly in the peak aging stage at ~ 17 hours. The growth behavior of θ ppts after the peak aging stage follows the coarsening kinetics and causes hardness softening. It is supposed that the corresponding increase and decrease in hardness can be attributed to the coherency strengthening and coherency loss of the θ ppts, respectively.

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Acknowledgments

The authors gratefully acknowledge the financial support for this study provided by the Ministry of Science and Technology (MOST), Taiwan, under Grant No. MOST 107-2221-E002-015-MY2.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan

    Yung-Chien Huang, Cheng-Si Tsao & Shyi-Kaan Wu

  2. Nuclear Fuel and Materials Division, Institute of Nuclear Energy Research, Taoyuan, 325, Taiwan

    Cheng-Si Tsao

  3. Department of Mechanical Engineering, National Taiwan University, Taipei, 106, Taiwan

    Shyi-Kaan Wu

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  1. Yung-Chien Huang
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Correspondence to Shyi-Kaan Wu.

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Manuscript submitted October 29, 2018.

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Huang, YC., Tsao, CS. & Wu, SK. Evolution and Growth Kinetics of θ Precipitates in Naturally Aged MgLiAlZn Alloy Studied by In Situ Small-Angle X-ray Scattering. Metall Mater Trans A 50, 1949–1956 (2019). https://doi.org/10.1007/s11661-019-05119-x

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