Weakly faceted cellular patterns versus growth-induced plastic deformation in thin-sample directional solidification of monoclinic biphenyl.
We present an experimental study of thin-sample directional solidification (T-DS) in impure biphenyl. The platelike growth shape of the monoclinic biphenyl crystals includes two low-mobility (001) facets and four high-mobility {110} facets. Upon T-DS, biphenyl plates oriented with (001) facets parallel to the sample plane can exhibit either a strong growth-induced plastic deformation (GID), or deformation-free weakly faceted (WF) growth patterns. We determine the respective conditions of appearance of these phenomena. GID is shown to be a long-range thermal-stress effect, which disappears when the growth front has a cellular structure. An early triggering of the cellular instability allowed us to avoid GID and study the dynamics of WF patterns as a function of the orientation of the crystal.
Börzsönyi
Tamás
T
INSP, UPMC Université Paris 6, CNRS UMR 7588, 140 rue de Lourmel, 75015 Paris. btamas@szfki.hu
Akamatsu
Silvère
S
Faivre
Gabriel
G
D001713:Biphenyl Compounds / Q000737:chemistry*; D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D055119:Elastic Modulus; D006244:Hardness; D008956:Models, Chemical; D008968:Molecular Conformation; D044367:Phase Transition
D001713:Biphenyl Compounds; C010574:biphenyl