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Effect of Metastable Mg2Si and Dislocations on α-Al(MnFe)Si Dispersoid Formation in Al-Mn-Mg 3xxx Alloys

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Abstract

The effect of metastable Mg2Si and dislocations on the formation of α-Al(MnFe)Si dispersoids in Al-Mn-Mg 3xxx alloys were studied by a close examination of the dispersoid precipitation process using the quench technique and TEM observation. Special attention was paid to the nucleation mechanisms. Mg plays an important role in promoting the formation of α-Al(MnFe)Si dispersoids. The number density and volume fraction of the dispersoids in the Mg-containing alloy are much higher than those in the control alloy without Mg, resulting in a strong dispersoid strengthening effect. During the heating process in the Mg-containing alloy, metastable Mg2Si precipitated and dissolved, leaving local Si-rich areas on pervious metastable Mg2Si, which provide favorable nucleation sites for α-Al(MnFe)Si dispersoids. It was found that β′-Mg2Si precipitates were more effective at the promotion of the dispersoid nucleation than β″-Mg2Si. In the deformed sample, the dislocations become the preferable sites for the α-Al(MnFe)Si dispersoid nucleation. By reducing dispersoid-free zones, the dispersoid distribution became more uniform compared to the non-deformed sample. The dispersoid nucleation mechanisms based on both metastable Mg2Si and dislocations are proposed and discussed.

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Acknowledgments

The authors would like to acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC) and Rio Tinto Aluminum through the NSERC Industry Research Chair in the Metallurgy of Aluminum Transformation at University of Quebec at Chicoutimi.

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Authors and Affiliations

  1. Department of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC, G7H 2B1, Canada

    Zhen Li, Zhan Zhang & X.-Grant Chen

Authors
  1. Zhen Li
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  2. Zhan Zhang
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  3. X.-Grant Chen
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Corresponding author

Correspondence to X.-Grant Chen.

Additional information

Manuscript submitted March 5, 2018.

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Li, Z., Zhang, Z. & Chen, XG. Effect of Metastable Mg2Si and Dislocations on α-Al(MnFe)Si Dispersoid Formation in Al-Mn-Mg 3xxx Alloys. Metall Mater Trans A 49, 5799–5814 (2018). https://doi.org/10.1007/s11661-018-4852-4

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  • DOI: https://doi.org/10.1007/s11661-018-4852-4

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