Open AccessEffect of crystallographic orientation on dendrite growth in directional solidification
Author(s) -
Xianbin Wang,
Lin Xin,
Lilin Wang,
Bai Bei-Bei,
Meng Wang,
Weidong Huang
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.108103
Subject(s) - dendrite (mathematics) , materials science , directional solidification , temperature gradient , planar , orientation (vector space) , crystal (programming language) , instability , thermal , crystallography , alloy , condensed matter physics , geometry , composite material , mechanics , chemistry , physics , thermodynamics , mathematics , computer graphics (images) , quantum mechanics , computer science , programming language
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.