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Achieving high strength above 400 MPa in conventionally extruded Mg-Ca-Zn ternary alloys

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Abstract

In this work, the role of Zn content in modifying the microstructure and mechanical properties of the Mg-1.2Ca-xZn (x=0.6, 2.0 wt.%, named as XZ10-0 and ZX21-0, respectively) based alloys was studied, and it is found that the yield strength (YS) of the present Mg-(Zn)-Ca based alloys increases monotonically with increasing the Zn concentration, from ~339 MPa in low-Zn content XZ10-0 sample to ~406 MPa in high-Zn content ZX21-0 sample. Microstructure characterization shows that the enhanced YS can be attributed to the grain refinement, fine and dispersed nano-phases, a large number of lamellae structures, and the decrease of recrystallization fraction. TEM results show that the formation mechanism for the ultra-fine grains in present Mg-(Zn)-Ca based alloys can be attributed to the co-segregation of Ca and Zn elements at the grain boundary, as well as the dynamic nanoprecipitations. When the Zn content is high, the nano-phases in ZX21-0 sample belong to the Ca2Mg6Zn3 ternary phases, which exert much higher thermal stability than the nano-sized Mg2Ca binary phases formed in the low-Zn content XZ10-0 sample. The finer size and higher number density of the nano-MgZnCa phases lead to the much finer grain size and sub-grain lamellae thickness in ZX21-0 sample, which thus results in the higher YS of ~406 MPa.

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Authors and Affiliations

  1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Sen Du, Kun Yang, Man Li, JingRen Li, YuPing Ren, HuCheng Pan & GaoWu Qin

  2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    QiuYan Huang

Authors
  1. Sen Du
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  2. Kun Yang
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  3. Man Li
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  4. JingRen Li
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  5. YuPing Ren
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  6. QiuYan Huang
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  7. HuCheng Pan
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  8. GaoWu Qin
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Corresponding author

Correspondence to HuCheng Pan.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51701211, and 51971053), and the Project of Promoting Talents in Liaoning Province (Grant No. XLYC1808038). PAN HuCheng acknowledges the financial assistance from Young Elite Scientists Sponsorship Program by CAST (Grant Nos. 2019-2021QNRC001, and 2019-2021QNRC002), the Fundamental Research Funds for the Central Universities (Grant No. N2002011) and the Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science (Grant No. 2019JH3/30100040).

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Du, S., Yang, K., Li, M. et al. Achieving high strength above 400 MPa in conventionally extruded Mg-Ca-Zn ternary alloys. Sci. China Technol. Sci. 65, 519–528 (2022). https://doi.org/10.1007/s11431-021-1911-3

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  • DOI: https://doi.org/10.1007/s11431-021-1911-3

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