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Effect of Li on formation of long period stacking ordered phases and mechanical properties of Mg-Gd-Zn alloy

Abstract

Alloys with composition of Mg96-x Gd3Zn1Li x (at.%) (x=0, 2, 4, and 6) were prepared by conventional casting. The microstructures of these alloys under as-cast and solid-solution conditions have been observed, and the mechanical properties were investigated. The results showed that Li is an effective element to refine the grains and break the eutectic networks in as-cast MgGd3Zn1 alloy. During solid solution treatment, these broken eutectic networks are spheroidized and highly dispersed. In addition, plentiful lamellar long period stacking ordered (LPSO) phases are precipitated in an α-Mg matrix when the Li addition is not more than 4%. Solid-solution treated Mg92Gd3Zn1Li4 alloy exhibits an optimal ultimate tensile strength (UTS) of 226 MPa and elongation of 5.8%. The strength of MgGd3Zn1 alloy is improved significantly, meanwhile, the toughness is apparently increased.

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Authors

Corresponding author

Correspondence to Jin-shan Zhang.

Additional information

Male, born in 1955, Professor. Research interests: strengthening and toughening of magnesium alloys.

This work was supported by the National Natural Science Foundation of China (Nos. 50571073, 51574175 and 51474153): the Ph.D. Programs Foundation of Ministry of Education of China (20111402110004): and the Natural Science Foundation of Shanxi Province (Nos. 2009011028-3 and 2012011022-1).

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Wei, Ly., Zhang, Js., Liu, W. et al. Effect of Li on formation of long period stacking ordered phases and mechanical properties of Mg-Gd-Zn alloy. China Foundry 13, 256–261 (2016). https://doi.org/10.1007/s41230-016-5126-7

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  • DOI: https://doi.org/10.1007/s41230-016-5126-7

Keywords

  • Mg-Gd-Zn alloys
  • Li
  • second phase
  • long period stacking ordered phase
  • comprehensive properties

CLC numbers

  • TG146.22