Journal of Northeastern University:Natural Science ›› 2015, Vol. 36 ›› Issue (10): 1422-1426.DOI: 10.3969/j.issn.1005-3026.2015.10.012

• Materials & Metallurgy • Previous Articles     Next Articles

Effects of Y on Microstructure and Properties of As-Extruded Mg-5Li Alloys

ZU Guo-yin, DU Peng, SONG Hong-quan, SUN Shi-liang   

  1. School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2014-09-09 Revised:2014-09-09 Online:2015-10-15 Published:2015-09-29
  • Contact: ZU Guo-yin
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Abstract: With the protection of surface covering agents and argon protection, the Mg-5Li-x Y(x=0, 1, 2, 3, 4) alloys were prepared by conventional casting methods. The effects of rare earth on microstructure and mechanical properties of the as-extruded alloys were investigated. The results showed that the RE compound Mg24Y5 generated after adding Y into the Mg-5Li alloy. The dynamic recrystallization arose during the hot extrusion process, leading to a large number of equiaxed grains appeared. The dispersive distribution of Mg24Y5 phase hindered the growth of the grains during the dynamic recrystallization, which led to the grain refinement. The as-extruded Mg-5Li-3Y alloy achieved the best mechanical property: the tensile strength and elongation reached up to 231.63MPa and 9.35%, respectively. The fracture mode of the alloy is mainly ductile fracture.

Key words: Mg-Li alloy, rare earth Y, extrusion, microstructure, mechanical property

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