Setyawan Wahyu, Selby Aaron P, Juslin Niklas, Stoller Roger E, Wirth Brian D, Kurtz Richard J
Pacific Northwest National Laboratory, Richland, WA 99354, USA.
J Phys Condens Matter. 2015 Jun 10;27(22):225402. doi: 10.1088/0953-8984/27/22/225402. Epub 2015 May 18.
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.
固体中高能原子碰撞会引发具有复杂形态的冲击波。在本文中，我们确定了此类级联碰撞中形态转变的存在。形态的序参量定义为缺陷产生曲线中作为级联能量函数的指数b（N(F) ~ E(MD)(b)）。当能量通过高、低能态之间的转变能量μ进行归一化时，不同体心立方金属的响应可以在一致的能量域中进行比较。利用铬、铁、钼和钨的数据，给出了体心立方金属中μ作为位移阈能E(d)函数的经验公式。
