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<p>To investigate the effect of rare earth (RE) elements (Gd or Y) on the workability of the Mg-10Li-3Al-0.5Zn (LA103, wt.%) alloys, the constitutive equations of these alloys were constructed and the plastic processing maps were drawn. The Al<sub>2</sub>RE phases were formed after the addition of RE elements at the expense of the quantity of the other non-RE secondary phases. A large number of AlLi phases are dissolved into the matrix after homogenization, accompanied by the spheroidization and refinement of the <i>α</i>-Mg phases. The activation energy of deformation (<i>Q</i>) of the LA103 alloy is hardly affected or slightly reduced by the addition of 0.5Gd or 0.5Y, respectively. The optimal processing parameters of all the alloys locate in the high temperature-low strain rate domains, which correspond to the uniform distribution of punctate AlLi phases and the reduction of the spherical AlLi phases. The addition of RE element enlarges the high efficiency zones in the DMM processing maps. However, the increase of compression strain barely changes the high efficiency zones but enlarges the instable domains.</p>

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Effect of Gd and Y Addition on Hot Compression Behavior and Workability of Mg-10Li-3Al-0.5Zn Alloy

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Gang Zeng,
  • Lianmei Wu,
  • Xinkai Kang,
  • Wenxia Hu,
  • Meng Fang,
  • Hongchao Xiao,
  • Fei Li,
  • Zihang Guo

摘要

To investigate the effect of rare earth (RE) elements (Gd or Y) on the workability of the Mg-10Li-3Al-0.5Zn (LA103, wt.%) alloys, the constitutive equations of these alloys were constructed and the plastic processing maps were drawn. The Al2RE phases were formed after the addition of RE elements at the expense of the quantity of the other non-RE secondary phases. A large number of AlLi phases are dissolved into the matrix after homogenization, accompanied by the spheroidization and refinement of the α-Mg phases. The activation energy of deformation (Q) of the LA103 alloy is hardly affected or slightly reduced by the addition of 0.5Gd or 0.5Y, respectively. The optimal processing parameters of all the alloys locate in the high temperature-low strain rate domains, which correspond to the uniform distribution of punctate AlLi phases and the reduction of the spherical AlLi phases. The addition of RE element enlarges the high efficiency zones in the DMM processing maps. However, the increase of compression strain barely changes the high efficiency zones but enlarges the instable domains.