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Influence of lanthanum on the microstructure, mechanical property and corrosion resistance of magnesium alloy

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Abstract

The microstructure, mechanical property and corrosion behavior of AZ91D with addition of lanthanum were investigated. With adding 1% lanthanum, the ultimate tensile strength and the elongation increased by 21.1% and by 101.2%, respectively. This mainly caused by the refinement of the β phase and the formation of Al11La3 strengthening phase. With adding 1% lanthanum in AZ91D alloy, the weight loss corrosion rate decreased to 47.2%. But when lanthanum content is over 1%, the corrosion rate increased. Small amount of lanthanum could form the small β phase similar to reticular structure, which could restrain the corrosion at some extent; large amount of lanthanum caused the depletion of aluminum in α matrix, which increased the corrosion rate.

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Acknowledgement

The present study is funded by the National High Technology R&D Program of China and National Natural Science Foundation of China (Contract No. 50474005).

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Authors and Affiliations

  1. State Key Laboratory of Metal Matrix Composite, Shanghai Jiaotong University, Shanghai, 200030, P. R. China

    Yu Fan, Guohua Wu, Hongtao Gao, Guanqun Li & Chunquan Zhai

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  1. Yu Fan
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  2. Guohua Wu
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  3. Hongtao Gao
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  5. Chunquan Zhai
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Correspondence to Yu Fan.

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Fan, Y., Wu, G., Gao, H. et al. Influence of lanthanum on the microstructure, mechanical property and corrosion resistance of magnesium alloy. J Mater Sci 41, 5409–5416 (2006). https://doi.org/10.1007/s10853-006-0256-8

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  • DOI: https://doi.org/10.1007/s10853-006-0256-8

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