Microstructure and mechanical properties of large-scale Mg-Gd-Y-Zn-Mn alloys prepared through semi-continuous casting

Research output: Journal contributionsJournal articlesResearchpeer-review


  • Kui Wang
  • Jingfeng Wang
  • Xiaoxu Dou
  • Yuanding Huang
  • Norbert Hort
  • Sarkis Gavras
  • Shijie Liu
  • Yanwu Cai
  • Jinxing Wang
  • Fusheng Pan

Large-scale Mg-8Gd-4Y-1Zn-Mn (wt.%) alloy ingot with a diameter of 315 mm and a length of 2410 mm was prepared through semi-continuous casting. Chemical composition, microstructure and mechanical properties at different locations of the samples with as-cast, T4 and T6 heat-treated states, respectively, were investigated. No obvious macro segregation has been detected in the high-quality alloy ingot. The main eutectic structures at all different locations are composed of α-Mg, Mg3RE-type, Mg5RE-type and LPSO phases. At the edge of ingot, the unusual casting twins including {101-2} extension twins and {101-1} compression twins were observed due to the intensive internal stress. In T4 heat-treated alloy, the micro segregation was eliminated. The remained phases were α-Mg and LPSO phase. Combined with the remarkable age-hardening response, T6 samples exhibits improved mechanical properties at ambient temperature, which derives from the dense prismatic β' precipitates and profuse basal γ' precipitates.

Original languageEnglish
JournalJournal of Materials Science and Technology
Pages (from-to)72-82
Number of pages11
Publication statusPublished - 01.09.2020
Externally publishedYes

    Research areas

  • Mechanical properties, Mg-Gd-Y-Zn-Mn alloy, Microstructure, Semi-continuous casting, Thermal treatment
  • Engineering