In this section, you can access to the latest technical information related to the FUTURE project topic.

Homogeneous and heterogeneous dislocation nucleation in diamond

Dislocation nucleation plays a key role in plastic deformation of diamond crystal. In this paper, homogeneous and heterogeneous nucleation nature for diamond 1 6 112 glide set dislocation and 1 2 110 shuffle set dislocation is studied by combining molecular dynamics method and continuum mechanics models. Our results show that although heterogeneous dislocation nucleation can decrease its activation energy, the activation energy at 0â?¯GPa for diamond heterogeneous nucleation is still in the range of 100â?¯eV. For 1 6 112 glide set and 1 2 110 shuffle set homogeneous nucleation, their critical nucleation shear stress approaches to diamond's ideal shear strength which implies that those dislocations do not nucleate before diamond structural instability only by a purely shearing manner. While for 1 6 112 glide set and 1 2 110 shuffle set heterogeneous nucleation, their critical nucleation shear stresses are 28.9â?¯GPa and 48.2â?¯GPa, these values are less than diamond's ideal shear strength which implies that these dislocations may be nucleated heterogeneously under certain shear stress condition. In addition, our results also indicate there exists a deformation mode transformation for diamond deformation behavior at strain rate of 10â??3/s. Our results provide a new insight into diamond dislocation nucleation and deformation.

» Author: Huizhen Yang, Jianwei Xiao, Ziwei Yao, Xiaoning Zhang, Fatima Younus, Roderick Melnik, Bin Wen

» Reference: Diamond and Related Materials

» More Information

« Go to Technological Watch



AIMPLAS Instituto Tecnológico del Plástico

C/ Gustave Eiffel, 4
(València Parc Tecnològic) - 46980
PATERNA (Valencia) - SPAIN

PHONE

(+34) 96 136 60 40

EMAIL

Project Management department - Sustainability and Industrial Recovery
life-future-project@aimplas.es