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Negative Strain-Rate Sensitivity of Mg Alloys Containing 18R and 14H Long-Period Stacking-Ordered Phases at Intermediate Temperatures

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Abstract

The strain-rate sensitivity of a Mg-10Dy-1Zn (wt pct) alloy containing different long-period stacking-ordered (LPSO) phases has been investigated in the strain rate range of 10−3 to 1 s−1 from room temperature to 673 K (400 °C). Both alloys containing 18R-LPSO and 14H-LPSO phases show negative strain-rate sensitivity (–0.02  to –0.01) at intermediate temperatures [423 K to 523 K (150 °C to 250 °C)]. The serration behavior of the Mg-10Dy-1Zn alloy containing 18R-LPSO phase is related to dynamic strain aging. However, the appearance of serrated flow in the Mg-10Dy-1Zn alloy containing 14H-LPSO phase is mostly rooted in the formation of microcracks in \( \left\{ {10\overline{1} 2} \right\} \) planes.

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This research is supported by the National Nature Foundation of China (NSFC-51101142, NSFC-50821001, and NSFC-51102206), New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0690), and Heibei Province Scientific Program (HPSP-13961002D and HPSP-Y2012019).

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Authors and Affiliations

  1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, P.R. China

    Xuecheng Cai (Researher), Hui Fu (Researher), Jianxin Guo (Researher) & Qiuming Peng (Professor)

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  1. Xuecheng Cai
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  2. Hui Fu
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  3. Jianxin Guo
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  4. Qiuming Peng
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Correspondence to Qiuming Peng.

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Manuscript submitted March 14, 2014.

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Cai, X., Fu, H., Guo, J. et al. Negative Strain-Rate Sensitivity of Mg Alloys Containing 18R and 14H Long-Period Stacking-Ordered Phases at Intermediate Temperatures. Metall Mater Trans A 45, 3703–3707 (2014). https://doi.org/10.1007/s11661-014-2348-4

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