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Microstructure and Mechanical Properties of Mg-7.71Gd-2.39Nd-0.17Zr Alloy After the Different Heat Treatments

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Magnesium Technology 2018 (TMS 2018)

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Abstract

Microstructure and mechanical properties of Mg-7.71Gd-2.39Nd-0.17Zr alloy after different heat treatments were investigated. The microstructure of the as-cast alloy was composed of α-Mg matrix, bone-shaped α-Mg + β-Mg5(Gd, Nd) eutectic, a little amount of small cuboid phase (GdH2) and Zr-rich cluster within α-Mg matrix. The optimal solution treatment was determined to be at 515 °C for 4 h. After solution treatment, bone-shaped α-Mg + β-Mg5(Gd, Nd) eutectic was almost dissolved into α-Mg matrix and the grain size increased slightly. Furthermore, a large amount of GdH2 was precipitated along the grain boundaries and within α-Mg matrix. After subsequent aging treatment at 200 °C for 32 h, Mg5Gd phases were precipitated along the grain boundaries. For the peak-aged alloy, the peak hardness of 105 HV was achieved and the ultimate tensile strength, yield strength and elongation at room temperature were up to 273.7, 188.2 MPa and 4.1%, respectively, which may be mainly attributed to the β″ and β′ phase precipitated within α-Mg matrix after ageing treatment.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51771152, 51227001 and 51420105005) and the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (Grant No. 138-QP-2015).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127 Youyi Western Road, Xi’an, 710072, People’s Republic of China

    Shifeng Luo, Guangyu Yang, Lei Xiao & Wanqi Jie

Authors
  1. Shifeng Luo
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  2. Guangyu Yang
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  3. Lei Xiao
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  4. Wanqi Jie
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Corresponding author

Correspondence to Guangyu Yang .

Editor information

Editors and Affiliations

  1. Lund University, Lund, Sweden

    Dmytro Orlov

  2. Pacific Northwest National Laboratory, Richland, Washington, USA

    Vineet Joshi

  3. Arizona State University, Tempe, Arizona, USA

    Kiran N. Solanki

  4. IND LLC, South Jordan, Utah, USA

    Neale R. Neelameggham

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Luo, S., Yang, G., Xiao, L., Jie, W. (2018). Microstructure and Mechanical Properties of Mg-7.71Gd-2.39Nd-0.17Zr Alloy After the Different Heat Treatments. In: Orlov, D., Joshi, V., Solanki, K., Neelameggham, N. (eds) Magnesium Technology 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72332-7_37

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