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Effect of La2O3 addition on the microstructure of partially remelted Mg-9Al-1Zn alloy

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Abstract

The effect of La2O3 addition on the microstructure of partially remelted Mg-9Al-1Zn (AZ91D) alloy was studied. The results indicate that small amounts of La2O3 additions to AZ91D alloy refined the partially remelted microstructure and caused the formation of new phase- LaAl4 in the microstructure. Moreover, the grain size of the partially remelted alloys is decreased with the increasing of La2O3 addition. In as-cast microstructure the LaAl4 phases have two morphologies: needle-like and particle-shape. The presence of more LaAl4 phases, especially, the particle-shape LaAl4 which dispersedly distributed within the grains can induce more dislocations, which can result in the occurring of a large amount of recrystallizations. Moreover, these LaAl4 phases can also restrain the growth and combination of the recrystallizations and partially remelted initial grains during the subsequent heat-treatment.

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Authors and Affiliations

  1. Key Laboratory of Automobile Materials of Ministry of Education and Department of Materials Science and Engineering, Jilin University at Nanling Campus, No.142 Renmin Street, Changchun, 130025, People's Republic of China

    P. Lu, J. G. Wang, J. F. Liu & Q. C. Jiang

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  1. P. Lu
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  2. J. G. Wang
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  3. J. F. Liu
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  4. Q. C. Jiang
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Correspondence to Q. C. Jiang.

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Lu, P., Wang, J.G., Liu, J.F. et al. Effect of La2O3 addition on the microstructure of partially remelted Mg-9Al-1Zn alloy. J Mater Sci 40, 6429–6432 (2005). https://doi.org/10.1007/s10853-005-1628-1

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  • DOI: https://doi.org/10.1007/s10853-005-1628-1

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