论文标题
观察暴露于辐射的钨的瞬态和渐近驱动的结构状态
Observation of transient and asymptotic driven structural states of tungsten exposed to irradiation
论文作者
论文摘要
将空间分辨的X射线LAUE衍射与原子尺度模拟相结合，我们观察到离子辐照的钨如何随着辐射暴露的增加而经历一系列非线性结构变换。纳米级缺陷诱导的变形在每个原子（DPA）上积聚高于0.02的位移（DPA）导致〜0.1 dpa处高度波动的菌株，从而塌陷成〜1 dpa以上的驱动的准稳态结构状态。驱动的渐近状态的特征是分散分散的空缺缺陷与延长的脱位网络共存，并且由于通过自相关的合并创造了新的晶体学平面，因此表现出正体积肿胀，但负晶状体菌株。
Combining spatially resolved X-ray Laue diffraction with atomic-scale simulations, we observe how ion-irradiated tungsten undergoes a series of non-linear structural transformations with increasing irradiation exposure. Nanoscale defect-induced deformations accumulating above 0.02 displacements per atom (dpa) lead to highly fluctuating strains at ~0.1 dpa, collapsing into a driven quasi-steady structural state above ~1 dpa. The driven asymptotic state is characterized by finely dispersed vacancy defects coexisting with an extended dislocation network, and exhibits positive volumetric swelling due to the creation of new crystallographic planes through self-interstitial coalescence, but negative lattice strain.
