The thermodynamical process in metal surface due to the irradiation of intense pulsed ion beam

In this paper, a new simulation model of interactions between IPIB and target material was constructed, that is T-coupled fluid elastoplastic equations, considering thermal conduction of target materials. The calculation program STEIPIB was written with C++ language. Meantime the distributions of energy deposition of intense pulsed ion beam (IPIB) with the energy and time spectrum were studied carefully as pulsed heat sources. As the results of the thermodynamical simulation calculation for the distributions of temperature and its gradient, stresses near the surface layer, the generation and propagation of shocks and so on are given. Also important influences of pulse parameters of IPIB on the ion beam modification of materials are discussed. The radical factor, leading to surface modification by energy impinging of IPIB, is the high power density of IPIB or the high absorption power density of the target. Moreover, the energy-based modification mechanism with the main characteristics of the flash heating and the long-range interaction was explained. Especially, the strengthening effects at the backside of the thin target under the influence of some shock were predicted and proved experimentally. (C) 2002 Elsevier Science B.V. All rights reserved.