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Microstructures and Tensile Properties of Mg-4Al-4La-0.4Mn-XB (X = 0, 0.01, 0.02, 0.03) Alloy

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Abstract

Influences of trace boron on microstructures and tensile properties of Mg-4Al-4La-based alloys prepared by cold-chamber high-pressure die-casting method were thoroughly investigated. The results indicate that adding trace boron to Mg-4Al-4La-based alloy can refine the dendrite arm spacing of primary alpha-Mg phases, which are mainly due to the little inoculating AlB2 particles. In addition, we found that adding 0.01–0.02 wt.% boron can drastically changes the eutectic morphology, with secondary particle dispersion becoming irregular and eutectic volume fraction being reduced. These phenomena can be attributed to the competitive nucleation between alpha-Mg and AlB2 particles for Al11La3 phases, and to the fact that more Al and La atoms saturate into the α-Mg matrix. Considering the tensile properties, although adding 0.01–0.02 wt.% boron decreased the strength of Mg-4Al-4La-based alloy, adding 0.03 wt.% boron significantly improved the tensile properties due to dispersion strengthening and, to a certain extent, solid-solution strengthening.

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Authors and Affiliations

  1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022, P.R. of China

    Jian Meng, Qiang Yang, Zheng Tian & Xin Qiu

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  1. Jian Meng
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  2. Qiang Yang
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  3. Zheng Tian
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  4. Xin Qiu
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  5. Fanzhi Meng
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Editor information

Editors and Affiliations

  1. Department of Materials Science and Engineering, University of Florida, USA

    Michele V. Manuel Ph.D., B.S. (associate professor) (associate professor)

  2. Structural Materials Unit, National Institute for Materials Science, Tsukuba, Japan

    Alok Singh Ph.D. (Chief Researcher) (Chief Researcher)

  3. Magnesium Elektron Group Worldwide, USA

    Martyn Alderman (Divisional Director of Technology) (Divisional Director of Technology)

  4. IND LLC, USA

    Neale R. Neelameggham (‘The Guru’) (‘The Guru’)

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© 2015 TMS (The Minerals, Metals & Materials Society)

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Meng, J., Yang, Q., Tian, Z., Qiu, X., Meng, F. (2015). Microstructures and Tensile Properties of Mg-4Al-4La-0.4Mn-XB (X = 0, 0.01, 0.02, 0.03) Alloy. In: Manuel, M.V., Singh, A., Alderman, M., Neelameggham, N.R. (eds) Magnesium Technology 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48185-2_18

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