Scholarlink

<p>The microstructural evolution at the liquid Al/solid Ni interface during remelting and resolidification was dynamically observed by using synchrotron radiography. The formation and growth behavior of Al<sub>3</sub>Ni<sub>2</sub> and Al<sub>3</sub>Ni brittle intermetallic compounds (IMCs) under different conditions was investigated, and the formation mechanisms of dendritic Al<sub>3</sub>Ni crystals with different morphologies were elucidated. The increasing remelting cycles accelerated the formation of Al<sub>3</sub>Ni<sub>2</sub> layer and the growth of Al<sub>3</sub>Ni IMCs. The increased-step heating temperatures and time promoted the morphological transition from faceted to non-faceted dendritic Al<sub>3</sub>Ni, which was attributed to the enhanced undercooling during solidification and incompletely remelted Al<sub>3</sub>Ni IMCs during remelting. The growth of regular Al<sub>3</sub>Ni dendrites was dominated by coalescence of secondary dendrite arms, while the growth of irregular dendrites Al<sub>3</sub>Ni was controlled by dendrite merging, radial melting and axial melting of secondary arms. The axially free dendritic Al<sub>3</sub>Ni was attributed to the small distance between adjacent main trunks, and the dense secondary arms promoted the formation of local solute depletion regions.</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

Unveiling growth and morphological transition of Al3Ni compounds during remelting cycles via synchrotron radiography

  • 期刊论文

  • 发表日期：

    2025年8月6日

查看全文
  • Jun-chao Yang,
  • Zong-ye Ding,
  • Hai-bing Li,
  • Quan-bin Lu,
  • Yong-tao Jiu,
  • Jian Qin,
  • Peng Guo,
  • Kai Wang,
  • Chuan Liu,
  • Jian-guo Li,
  • Qiao-dan Hu

摘要

The microstructural evolution at the liquid Al/solid Ni interface during remelting and resolidification was dynamically observed by using synchrotron radiography. The formation and growth behavior of Al3Ni2 and Al3Ni brittle intermetallic compounds (IMCs) under different conditions was investigated, and the formation mechanisms of dendritic Al3Ni crystals with different morphologies were elucidated. The increasing remelting cycles accelerated the formation of Al3Ni2 layer and the growth of Al3Ni IMCs. The increased-step heating temperatures and time promoted the morphological transition from faceted to non-faceted dendritic Al3Ni, which was attributed to the enhanced undercooling during solidification and incompletely remelted Al3Ni IMCs during remelting. The growth of regular Al3Ni dendrites was dominated by coalescence of secondary dendrite arms, while the growth of irregular dendrites Al3Ni was controlled by dendrite merging, radial melting and axial melting of secondary arms. The axially free dendritic Al3Ni was attributed to the small distance between adjacent main trunks, and the dense secondary arms promoted the formation of local solute depletion regions.