Directionally-solidified dendrite morphology with eight secondary arms in an FCC ordered phase alloy

Yuhi Mori, Hiroshi Harada, Tadaharu Yokokawa, Toshiharu Kobayashi, Shinsuke Suzuki

Research output: Contribution to journalArticle

Abstract

We found a new dendritic solidification morphology with secondary arms growing in eight directions rather than the 〈1 0 0〉 directions expected for a face-centered cubic (FCC) alloy. A bulk single crystal of a Ni-base γ′ single-phase alloy was cast by withdrawing method in a directional solidification furnace. The solidification structure was observed using scanning electron microscopy and analyzed using electron back-scatter diffraction. These results demonstrated that the growth direction of the primary dendrites was [0 0 1], which is known to be the preferred growth direction for FCC metals and alloys. However, the primary dendrite had eight secondary arms growing in the high-Miller-index directions between 〈1 0 0〉 and 〈1 1 0〉. The main factor behind this new dendrite morphology is likely to be the anisotropic atomic stacking of L12 ordered phase, which is the primary phase of the investigated alloy.

Original languageEnglish
Pages (from-to)15-22
Number of pages8
JournalJournal of Crystal Growth
Volume500
DOIs
Publication statusPublished - 2018 Oct 15

Keywords

  • A1. Crystal structure
  • A1. Dendrites
  • A1. Directional solidification
  • A2. Growth from melt
  • A2. Single crystal growth
  • B1. Alloys

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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