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Role of Alloying Elements in the Mechanical Behaviors of An Mg-Zn-Zr-Er Alloy

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Abstract

The mechanical behavior of the as-extruded and heat-treated Mg-1.5Zn-0.6Zr and Mg-1.5Zn-0.6Zr-2Er alloys was investigated and correlated with microstructure evolution. Deformation mechanisms are detailed. No evidence of twinning was observed under compression in the Er-bearing alloy throughout the grain size range of ~5 to 27 μm at a strain rate of 0.001 or 1/s. The compressive yield strength followed a Hall–Petch relation with a slope of ~10.3 MPa/mm1/2. Er played a major role in the pyramidal 〈c+a〉 slip that was identified as a dominant plastic deformation mechanism. The CRSS for 〈c+a〉 slip system was greatly reduced and was 98 MPa in the as-extruded alloy. While it did not change the mechanical response of the Mg-1.5Zn-0.6Zr-2Er alloy, annealing was found to promote dissolution of Zn in the Mg matrix, leading to an increase in CRSS for extension twinning in the heat-treated Mg-1.5Zn-0.6Zr alloy. As a result, twinning was only observed under a higher strain rate of 1/s in compression. The CRSS for extension twinning for the heat-treated alloy with a grain size of ~28 μm was estimated to be 40 MPa, a bit lower than that for the Er-bearing alloy of the same grain size, which was 42 MPa.

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Acknowledgments

The authors are grateful for the financial support of the National Natural Science Foundation of China (No. 51271207).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, P.R.China

    Jing Zhang (Professor), Min Liu (Postgraduate Student), Yuchen Dou (Ph.D. Student) & Guobao Liu (Postgraduate Student)

  2. National Engineering Research Center for Magnesium Alloys, Chongqing, 400044, P.R.China

    Jing Zhang (Professor)

Authors
  1. Jing Zhang
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  2. Min Liu
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Correspondence to Jing Zhang.

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Manuscript submitted October 1, 2013.

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Zhang, J., Liu, M., Dou, Y. et al. Role of Alloying Elements in the Mechanical Behaviors of An Mg-Zn-Zr-Er Alloy. Metall Mater Trans A 45, 5499–5507 (2014). https://doi.org/10.1007/s11661-014-2526-4

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