Open AccessInvestigation of atom-attaching process of three-dimensional body-center-cubic dendritic growth by phase-field crystal model
Author(s) -
Guo Can,
Jincheng Wang,
Zhijun Wang,
Junjie Li,
Yi Guo,
Sai Tang
Publication year - 2015
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.64.028102
Subject(s) - nucleation , materials science , atom (system on chip) , dendrite (mathematics) , crystal (programming language) , phase (matter) , crystallography , anisotropy , molecular physics , condensed matter physics , chemical physics , physics , optics , thermodynamics , geometry , chemistry , quantum mechanics , mathematics , computer science , programming language , embedded system
On the basis of the Gaussian kernel phase field crystal model (PFC), we propose a modified PFC model. The atom-attaching process of three-dimensional body-center-cubic (BCC) dendritic growth is examined by using the modified PFC model. Our simulations indicate that in the process of the morphology evolution from regular dodecahedron to dendrite shape, the nucleation position of new layer is transferred from the center of {110} planes into the region of {110} plane near the tips, and then the BCC dendritic morphology is obtained. In the process of dendritic growth, first, new solid atom absorption takes place near dendrite tips, then liquid atoms start to grow up on the existing solid phase rapidly. After the dendrite tips are completely occupied by new atoms, new nuclei begin to form again. Increasing the initial atom density n will increase the velocity coefficient C and the anisotropy of C.