Scholarlink

<p>Hot backward extrusion is widely used for magnesium alloy cups. Limited ductility and non-uniform flow make the corner prone to cracking. An EZ30 Mg cup was studied by EBSD and DEFORM-3D simulations. The Oyane ductile fracture criterion was used to evaluate damage evolution. Simulations and experiments show a consistent failure sequence. Damage localizes first on the outer corner side. The crack then propagates toward the inner filet between the cup bottom and wall. Punch tilt raises the maximum damage by 13.3%. Eccentricity causes a smaller increase of 6.1%. Thus, tilt is the more critical source of fracture risk. EBSD reveals a strong microstructural gradient along the forming path. The wall is dominated by recrystallized grains, with a recrystallized fraction of 95%. The corner retains a bimodal structure with severe dislocation accumulation. In the outer corner, ~ 87.1% of the area shows medium-to-high GOS. The average GND density is 2.53 × 10<sup>15</sup>&#xa0;m<sup>−2</sup>. The prismatic dislocation fraction reaches 97%. These features reduce strain accommodation and accelerate damage localization. This experimental–numerical framework supports failure prediction and die-accuracy optimization.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Failure Behavior of an EZ30 Magnesium Alloy Cup during Hot Backward Extrusion: Experimental and Numerical Analysis Based on the Oyane Criterion

  • 期刊论文

  • 发表日期：

    2026年8月1日

查看全文
  • Yonghua Huang,
  • Jiawei Liang,
  • Feng Sha,
  • Shiping Liu,
  • Wenke Wang,
  • Wenjie Wu,
  • Xuemei Sun,
  • Wenzhen Chen

摘要

Hot backward extrusion is widely used for magnesium alloy cups. Limited ductility and non-uniform flow make the corner prone to cracking. An EZ30 Mg cup was studied by EBSD and DEFORM-3D simulations. The Oyane ductile fracture criterion was used to evaluate damage evolution. Simulations and experiments show a consistent failure sequence. Damage localizes first on the outer corner side. The crack then propagates toward the inner filet between the cup bottom and wall. Punch tilt raises the maximum damage by 13.3%. Eccentricity causes a smaller increase of 6.1%. Thus, tilt is the more critical source of fracture risk. EBSD reveals a strong microstructural gradient along the forming path. The wall is dominated by recrystallized grains, with a recrystallized fraction of 95%. The corner retains a bimodal structure with severe dislocation accumulation. In the outer corner, ~ 87.1% of the area shows medium-to-high GOS. The average GND density is 2.53 × 1015 m−2. The prismatic dislocation fraction reaches 97%. These features reduce strain accommodation and accelerate damage localization. This experimental–numerical framework supports failure prediction and die-accuracy optimization.