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Microstructure and Mechanical Properties of Mg–2.0Gd–1.2Y–1.0Zn–0.2Zr Alloy

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Abstract

The microstructural evolution of Mg–2.0Gd–1.2Y–1.0Zn–0.2Zr (GWZK) alloy during homogenization and subsequent aging heat-treatment and the tensile properties of the peak-aged sample at various temperatures have been investigated. The phase transformation during homogenization, static precipitation during aging, and deformation mechanisms at 250 °C are systematically analyzed through XRD, TEM and EBSD measurements. The peak-aged GWZK alloy has good combination of strength and ductility at elevated temperatures owing to its high thermal stability by the LPSO phases distributed along the grain boundaries. The change (19 MPa) in the yield strength of peak-aged samples between RT and 250 °C is mainly related to easy gliding of dislocations on the non-basal planes due to the decrease in critical resolved shear stress of slip. Two strengthening models are applied to quantitatively describe the effect of \({\left\{11\stackrel{-}{2}0\right\}}_{\alpha }\) precipitate plates on Orowan strengthening corresponding to RT and 250 °C. Ignoring changes in solid solution strengthening and grain boundary strengthening of the peak-aged sample caused by increasing temperature, the calculated reduction value (16.5 MPa) in macroscopic yield strength from RT (based on the basal < a > slip mode) to 250 °C (based on the pyramidal < c + a > slip mode) is in good agreement with the measured reduction value (19 MPa).

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Acknowledgements

The authors gratefully acknowledge the support of Nation Natural Science Foundation of China (Grant Nos. 51931004 and 51621063) and the 111 Project 2.0 (BP2018008).

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, People’s Republic of China

    Jianan Liu, Xiaoru Zhang, Wenxue Lv, Yumei Zhou, Daqing Fang, Xiangdong Ding & Jun Sun

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  1. Jianan Liu
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  2. Xiaoru Zhang
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  3. Wenxue Lv
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  4. Yumei Zhou
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Correspondence to Daqing Fang.

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Liu, J., Zhang, X., Lv, W. et al. Microstructure and Mechanical Properties of Mg–2.0Gd–1.2Y–1.0Zn–0.2Zr Alloy. Met. Mater. Int. 27, 1969–1979 (2021). https://doi.org/10.1007/s12540-020-00782-x

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