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Grain Refining Efficiency and the Role of Alloying Elements in Determining the Nucleation Potency of LaB6 in Aluminum Alloys

  • Aluminum and Magnesium: Casting Technology and Solidification
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Abstract

This work discloses the refinement mechanism of LaB6 in three binary aluminum alloys via grain refinement experiments, model calculation, and cooling curve analysis. The refining efficacy of LaB6 in aluminum was influenced by an interfacial relationship which can be controlled by alloying with different solute elements. Al atoms attach directly onto the surface of the LaB6 substrate during solidification. Because the lattice parameter of α-Al increased after alloying with larger metal atoms, the lattice mismatch between LaB6 and Al matrix decreased. This investigation reveals that the nucleating behavior of LaB6 can be influenced by adding solute Si, Mg, and Cu, and thereby offers a pathway for controlling the content of aluminum alloys.

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Acknowledgements

This research is financially supported by Jiangsu key laboratory for advanced metallic materials (BM2007204) and the Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology (ASMA201501). The authors thank Dr. K. Zhang and C.W Jin for their assistance with TEM analysis.

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  1. School of Materials Science and Engineering, Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing, 211189, China

    Lijun Jing, Tao Lu & Ye Pan

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  1. Lijun Jing
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  2. Tao Lu
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Correspondence to Ye Pan.

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Jing, L., Lu, T. & Pan, Y. Grain Refining Efficiency and the Role of Alloying Elements in Determining the Nucleation Potency of LaB6 in Aluminum Alloys. JOM 72, 3725–3732 (2020). https://doi.org/10.1007/s11837-019-03970-2

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