High-temperature superplastic behavior and ECAP deformation mechanism of two-phase Mg-Li alloy

作者：Chen, Dexin^*; Kong, Jing; Gui, Zhenzhen; Li, Wei; Long, Yan; Kang, Zhixin^*

来源：Materials Letters, 2021, 301: 130358.

DOI：10.1016/j.matlet.2021.130358

• Metals and alloys
• Microstructure
• Superplasticity
• Deformation mechanism

Fine grains of Two-phase Mg-Li alloy could be achieved by severe plastic deformation. The alloy exhibited a superplastic behavior with a maximum elongation of 306.6% at 623 K with an initial rate of 1.5 x 10-2 s- 1. The value of the strain rate sensitivity under 623 K and 1.5 x 10-2s-1 is 0.36, and 121.6-160.0 kJ/mol. The dominant deformation mechanism in this alloy is grain boundary sliding accommodated by a slip which was controlled by lattice diffusion at 523-623 K.

• 单位
  广州大学; 中国科学院