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Effect of Al-3Nb-1B Master Alloy on the Grain Refinement of AZ91D Magnesium Alloy

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Abstract

An Al-3Nb-1B master alloy has been prepared using a melt reaction method. The microstructure of the master alloy and its refinement performance on AZ91D magnesium alloy were investigated. Experimental results showed that the Al-3Nb-1B master alloy was mainly composed of α-Al and NbB2 phases. With the increase of the addition amount of Al-3Nb-1B master alloy, the primary α-Mg grains of AZ91D magnesium alloy were further refined. Upon adding 0.5 wt pct Al-3Nb-1B master alloy, the average grain size of the primary α-Mg decreased from 240 to 52 μm. The present results indicated that NbB2 can act as effective heterogeneous nucleus of the primary α-Mg, which accounted for the good grain refining performance on AZ91D magnesium alloy. Compared with the unrefined alloy, the yield strength, ultimate tensile strength, and elongation of AZ91D magnesium alloy refined by 0.5 wt pct Al-3Nb-1B master alloy were increased by 18.4, 15.7, and 27.3 pct, respectively due to the grain refinement effect.

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Acknowledgments

The research work was supported by National Natural Science Foundation of China (Grant Nos. 51261026 and 51401102) and the Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province (Grant No. JW201423004).

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Authors and Affiliations

  1. Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province, Nanchang Hangkong University, Nanchang, 330063, P. R. China

    Lei Zhang (Lecturer), Wei Zhou (Master), Penghe Hu (Master) & Quan Zhou (Associate Professor)

Authors
  1. Lei Zhang
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  2. Wei Zhou
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  3. Penghe Hu
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  4. Quan Zhou
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Correspondence to Lei Zhang.

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Manuscript submitted on November 12, 2015.

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Zhang, L., Zhou, W., Hu, P. et al. Effect of Al-3Nb-1B Master Alloy on the Grain Refinement of AZ91D Magnesium Alloy. Metall Mater Trans B 47, 1999–2004 (2016). https://doi.org/10.1007/s11663-016-0668-z

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  • DOI: https://doi.org/10.1007/s11663-016-0668-z

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