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Critical loading conditions of amorphization, phase transformation, and dilation cracking in 6H‐silicon carbide
Author(s) -
Wu Zhonghuai,
Liu Weidong,
Zhang Liangchi
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15527
Subject(s) - materials science , cracking , silicon carbide , hydrostatic pressure , deformation mechanism , deformation (meteorology) , composite material , hydrostatic equilibrium , compression (physics) , thermodynamics , microstructure , physics , quantum mechanics
Amorphization, phase transformation, and dilation cracking are 3 major deformation/failure mechanisms of monocrystalline 6H‐SiC. This paper studies their critical formation conditions and mechanisms under hydrostatic pressure and uniaxial compression and tension with the aid of large‐scale molecular dynamics simulations. It was found that under hydrostatic pressure the major deformation mechanism is amorphization, that under uniaxial compression the major mechanism turns to phase transformation at low temperature and amorphization at high temperature, and that under uniaxial tension the dominating mechanism becomes dilation cracking. Increasing the temperature reduces the thresholds significantly and brings about a heterogeneous deformation mode. The study further concluded that these deformation mechanisms and their thresholds can be predicted theoretically.