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Thermally Activated Slip in Rare Earth Containing Mg-Mn-Ce Alloy, ME10, Compared with Traditional Mg-Al-Zn Alloy, AZ31

  • Aluminum and Magnesium: High Strength Alloys for Automotive and Transportation Applications
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Abstract

It is of interest to assess the thermally activated nature of the deformation mechanisms responsible for the anisotropic response of textured Mg alloys, especially in those alloys that do and do not contain rare earth elements. The repeated stress relaxation method in combination with elasto-viscoplastic self-consistent (EVPSC) polycrystal modeling is employed to determine the strain rate sensitivity and true activation volume of samples of textured, polycrystalline Mg alloys, ME10 and AZ31, loaded along different directions in both the hard-rolled (F) and annealed (O) tempers. The results of Haasen plot analyses suggest that a superposition of at least two key mechanisms is responsible for controlling the thermally activated motion of dislocation for both of the alloy types investigated. One has a lower activation volume (solute-dislocation interaction and/or cross-slip), while the other is the ever-present forest dislocation interaction.

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Acknowledgements

The authors thank the United States National Science Foundation, Division of Materials Research, Metals and Metallic Nanostructures (NSF-DMR-MMN) program, Grant No. 1810197, overseen by program manager Dr. Lynnette Madsen, for their financial support.

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Authors and Affiliations

  1. University of Virginia, Charlottesville, VA, 22904-4745, USA

    Vikaas Bajikar, Jishnu J. Bhattacharyya, Nathan Peterson & Sean R. Agnew

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  1. Vikaas Bajikar
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  2. Jishnu J. Bhattacharyya
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  3. Nathan Peterson
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  4. Sean R. Agnew
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Correspondence to Jishnu J. Bhattacharyya.

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Bajikar, V., Bhattacharyya, J.J., Peterson, N. et al. Thermally Activated Slip in Rare Earth Containing Mg-Mn-Ce Alloy, ME10, Compared with Traditional Mg-Al-Zn Alloy, AZ31. JOM 71, 2040–2046 (2019). https://doi.org/10.1007/s11837-018-3310-5

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  • DOI: https://doi.org/10.1007/s11837-018-3310-5

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