Effect of crystallographic orientation on dendrite growth in directional solidification

Xian Bin Wang, Xin Lin, Li Lin Wang, Bei Bei Bai, Meng Wang, Wei Dong Huang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Dendrite is a typical pattern in directional solidification, attracting many theoretical and experimental researches. However, the effect of crystallographic orientation on dendrite growth is less considered in these researches. In this paper, using a transparent model alloy SCN-1.0 wt% Eth, the effects of crystallographic orientation on the incubation time of planar interface instability, the dendritical morphological feature, and the primary dendrite spacing in directional solidification are investigated. Three crystal grains with different angles between the dendrite axis direction and thermal gradient direction are chosen in our experimental. The experimental results show that the incubation time of planar interface instability increases with the deviation of dendrite axis from thermal gradient direction, which suggests that the deviation of dendrite axis favors the planar interface stability. And with the increase of deviation angle of dendrite axis, the side branches of dendrite become more asymmetric and the preferred side-branches suppress neighboring dendrite growth. Also it is found that the primary dendrite spacing becomes larger as the angle between the dendrite axis direction and thermal gradient direction increases.

Original languageEnglish
Article number108103
JournalWuli Xuebao/Acta Physica Sinica
Volume62
Issue number10
DOIs
StatePublished - 20 May 2013

Keywords

  • Crystallographic orientation
  • Dendrite spacing
  • Diretional solidification
  • Planar interface instability

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