Buckle, ruck and tuck: A proposed new model for the response of graphite to neutron irradiation
Buckle, ruck and tuck: A proposed new model for the response of graphite to neutron irradiation
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DOI：
10.1016/j.jnucmat.2011.04.015
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发表时间：
2011-06-30
影响因子：
3.1
通讯作者：
Haffenden, G.
中科院分区：
文献类型：
--
作者：
Heggie, M. I.;Suarez-Martinez, I.;Haffenden, G.
石墨辐射损伤的缺省理论认为Frenkel对的形成是物理性质变化的主要原因。我们列出了它的不足之处，并提出了两个新的机制，有助于更好地说明尺寸和存储能量的变化。损伤取决于衬底温度，在大约250摄氏度时发生变化。低于该温度，粒子辐射赋予层永久的纳米屈曲。在它上面，层折叠，形成我们所描述的皱和褶缺陷。我们提出的第一性原理和分子力学计算的能量和结构，以支持这些主张。我们有必要推广层状材料的位错理论。我们引用良好的实验证据，这些功能从文献中的石墨辐射损伤。(C)2011 Elsevier B.V.保留所有权利。
The default theory of radiation damage in graphite invokes Frenkel pair formation as the principal cause of physical property changes. We set out its inadequacies and present two new mechanisms that contribute to a better account for changes in dimension and stored energy. Damage depends on the substrate temperature, undergoing a change at approximately 250 degrees C. Below this temperature particle radiation imparts a permanent, nano-buckling to the layers. Above it, layers fold, forming what we describe as a ruck and tuck defect. We present first principles and molecular mechanics calculations of energies and structures to support these claims. Necessarily we extend the dislocation theory of layered materials. We cite good experimental evidence for these features from the literature on radiation damage in graphite. (C) 2011 Elsevier B.V. All rights reserved.