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<p>Microstructure and mechanical properties of Mg-2Y-0.5Zn-0.5Ni-0.5Co (AZNC, at.%) alloy in the as-cast, homogeneous, and extruded states were investigated. The results showed that the as-cast AZNC alloy mainly consisted of <i>α</i>-Mg matrix, gray lamellar 18R-LPSO phase, and white irregular Mg<sub>2</sub>Y, MgY(Co, Zn, Ni)<sub>4</sub>, and Mg<sub>3</sub>(Co, Zn, Ni, Y) granular phases. After homogenization treatment, a large number of strip 14H-LPSO phases precipitated in the grain interior. After hot extrusion, the alloy underwent significant dynamic recrystallization with a significant grain refinement from 46.5&#xa0;μm in homogenized state to 2.98&#xa0;μm in extruded state, while the second phases were fragmented and diffusely distributed along the extrusion direction. The tensile testing results indicated that the extruded AZNC alloy exhibited the best tensile strengths compared with the as-cast and homogenized alloys, whose ultimate tensile strength (<i>σ</i><sub>b</sub>), yield strength (<i>σ</i><sub>0.2</sub>), and elongation to failure (<i>ε</i><sub>f</sub>) were 280&#xa0;MPa, 225&#xa0;MPa, and 11.7%, respectively. The high tensile properties of the extruded AZNC alloy were mainly attributed to the grain refinement and the second-phase strengthening by the high volume fraction of LPSO phase.</p>

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Microstructure and Mechanical Properties of Extruded Mg-Y-Zn-Ni-Co Alloy

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Binxin An,
  • Jing Jiang,
  • Haobin Xu,
  • Lin Tong,
  • Run Wang,
  • ZiLin Yang,
  • Guangli Bi,
  • Yuandong Li

摘要

Microstructure and mechanical properties of Mg-2Y-0.5Zn-0.5Ni-0.5Co (AZNC, at.%) alloy in the as-cast, homogeneous, and extruded states were investigated. The results showed that the as-cast AZNC alloy mainly consisted of α-Mg matrix, gray lamellar 18R-LPSO phase, and white irregular Mg2Y, MgY(Co, Zn, Ni)4, and Mg3(Co, Zn, Ni, Y) granular phases. After homogenization treatment, a large number of strip 14H-LPSO phases precipitated in the grain interior. After hot extrusion, the alloy underwent significant dynamic recrystallization with a significant grain refinement from 46.5 μm in homogenized state to 2.98 μm in extruded state, while the second phases were fragmented and diffusely distributed along the extrusion direction. The tensile testing results indicated that the extruded AZNC alloy exhibited the best tensile strengths compared with the as-cast and homogenized alloys, whose ultimate tensile strength (σb), yield strength (σ0.2), and elongation to failure (εf) were 280 MPa, 225 MPa, and 11.7%, respectively. The high tensile properties of the extruded AZNC alloy were mainly attributed to the grain refinement and the second-phase strengthening by the high volume fraction of LPSO phase.