Atomistic simulation of the relaxed structure and energy of edge dislocation in metal Ta
XIE Li-juan, ZHANG Jian-min
(Collage of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
Combined the modified analytical embedded atom method (MAEAM) with molecular dynamics (MD) simulation method, both the relaxed structure and strain energy of an a[100] edge dislocation in metal Ta have been simulated on atomic scales. The results show that the relaxed structure has a C2v type group symmetry. The calculated strain energy Es per unit length of the dislocation line is a linear function of ln(R/2b) while radial distance R≥1.5b=4.953 9×10-8 cm, thus the corresponding core radius is determined to be rc=4.953 9×10-8 cm, the dislocation core energy Ecore=1.574 5×108 eV/cm can be obtained with the intercept from a linear fit.
KeyWords:
edge dislocation; Ta; modified analytical embedded atom method