Cascade morphology transition in bcc metals. (18th May 2015)

• Record Type: Journal Article
• Authors: Setyawan, Wahyu; Selby, Aaron P; Juslin, Niklas; Stoller, Roger E; Wirth, Brian D; Kurtz, Richard J
• Is Part Of: Journal of physics. Volume 27:Number 22(2015)
• Publication Date: 2015-05-18
• Subjects: displacement cascade -- morphology transition -- threshold energy -- morphology classification -- sub-cascade -- molecular dynamics simulation -- tungsten molybdenum iron chromium; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/27/22/225402
• Languages: English
• ISSNs: 0953-8984

Abstract

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 . 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.