Significant differences in defect accumulation behaviour between fcc and bcc crystals under cascade damage conditions
Significant differences in defect accumulation behaviour between fcc and bcc crystals under cascade damage conditions
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DOI：
10.1016/0022-3115(95)00121-2
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发表时间：
1995-11
影响因子：
3.1
通讯作者：
B. Singh;J. Evans
中科院分区：
文献类型：
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作者：
B. Singh;J. Evans
对面心立方和体心立方金属和合金中辐照引起的损伤产生和积累的各个方面进行了检查。汇编并比较了单个级联中缺陷形态的演变、平面（团簇/环）和三维缺陷团聚体（空隙）的整体演变以及面心立方和面心立方金属中环和空隙形式的缺陷积累的温度依赖性的结果。比较表明，fcc 和 bcc 金属中簇/环和空洞形式的损伤累积及其对辐照温度的依赖性显着不同。这些差异可能是由于（级联中）幸存缺陷数量以及级联内空位和自填隙原子（SIA）的级联内聚集（在级联的热尖峰阶段已经建立）的显着差异而产生的。讨论了这些差异的含义。建议对 fcc 和 bcc 金属损伤累积的理论处理必须明确包括级联内空位聚类和 SIA 的细节，例如，聚类空位与非聚类空位和 SIA 的比率。
Various aspects of irradiation-induced damage production and accumulation in fcc and bcc metals and alloys are examined. Results on the evolution of defect morphology in individual cascades, the global evolution of planar (clusters/loops) and three-dimensional defect agglomerates (voids) and the temperature dependence of defect accumulation in the form of loops and voids in fcc and bcc metals are compiled and compared. The comparison demonstrates that the damage accumulation in the form of clusters/loops and voids and their dependence on irradiation temperature are dramatically different in fcc and bcc metals. These differences may arise because of significant differences in the number of surviving defects (in cascades) and intracascade clustering of vacancies and self-interstitial atoms (SIAs) that get established already during the thermal spike phase of cascades. The implications of these differences are discussed. It is suggested that theoretical treatments of the damage accumulation in fcc and bcc metals must explicitly include the details of intracascade clustering of vacancies and SIAs, for example, the ratio of clustered to non-clustered vacancies and SIAs.