1.
J Phys Condens Matter
; 27(22): 225402, 2015 Jun 10.
Article
in English
| MEDLINE
| ID: mdl-25985256
ABSTRACT
Energetic atom collisions in solids induce shockwaves with complex morphologies. In this paper, we establish the existence of a morphological transition in such cascades. The order parameter of the morphology is defined as the exponent, b, in the defect production curve as a function of cascade energy (N(F) ~ E(MD)(b)). Response of different bcc metals can be compared in a consistent energy domain when the energy is normalized by the transition energy, µ, between the high- and the low-energy regime. Using Cr, Fe, Mo and W data, an empirical formula of µ as a function of displacement threshold energy, E(d), is presented for bcc metals.