Dendrite Break up in Solidification of Undercooled B-doped Si Melts

• OKAMOTO Hideki

  Tokai University Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

• NAGASHIO Kosuke

  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

• KURIBAYASHI Kazuhiko

  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

• JIMBO Itaru

  Tokai University

抄録

The fragmentation of the faceted dendrite of B-doped Si solidified from the undercooled melt was investigated using an electromagnetic levitator. The ＜110＞ dendrites, which grew at Δ T＜ ～ 100 K, never fragmented because they were composed of {111} planes with a lowest interface energy. On the other hand, the ＜100＞ dendrites, which grew at Δ T＞～ 100 K showing fourfold axial symmetry, broke up into small pieces at undercoolings of more than 200 K. It was suggested that the capillary force acts on the interface with a relatively high energy to break up the dendrite into small pieces, since the ＜100＞ dendrite is composed of {110} and {100} planes with interface energies larger than that of the {111} plane. Moreover, striations of concentric circles formed by the segregation of B revealed that the remaining melt solidifies from the surface toward the center to engulf the fragmented dendrites. This suggests that the ＜100＞ dendrites fragmented during and/or after the recalescence.

収録刊行物

• 日本マイクログラビティ応用学会誌

  日本マイクログラビティ応用学会誌 24 (1), 3-, 2007-01-31

  日本マイクログラビティ応用学会

詳細情報

• CRID: 1391975831237529600
• NII論文ID: 10018498558
• NII書誌ID: AN10537663
• DOI: 10.15011/jasma.24.1.3
• NDL書誌ID: 8675975
• ISSN: 09153616
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8675975
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可