Cascade morphology transition in bcc metals
W Setyawan and AP Selby and N Juslin and RE Stoller and BD Wirth and RJ Kurtz, JOURNAL OF PHYSICS-CONDENSED MATTER, 27, 225402 (2015).
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 similar to 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, mu, between the high- and the low-energy regime. Using Cr, Fe, Mo and W data, an empirical formula of mu as a function of displacement threshold energy, E-d, is presented for bcc metals.
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