Radiation hardening revisited: role of intracascade clustering
Radiation hardening revisited: role of intracascade clustering
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DOI：
10.1016/s0022-3115(97)00231-6
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发表时间：
1997-10-01
影响因子：
3.1
通讯作者：
Trinkaus, H
中科院分区：
文献类型：
--
作者：
Singh, BN;Foreman, AJE;Trinkaus, H
分析了裂变中子辐照金属和合金塑性变形起始的实验观察结果。实验结果显示，辐照引起的上屈服应力增加，随后是屈服下降和塑性不稳定，但无法用传统的分散势垒硬化来解释，因为（a）生长的位错不是自由的，（b）辐照引起的缺陷团簇不是刚性的坚不可摧的奥罗文障碍物。B。提出了一种新的模型，称为“级联诱导源硬化”的设想，直接在级联产生的滑动环装饰生长的位错，使他们不能作为位错源。上限屈服应力与分离应力有关，该应力是将位错从装饰它的簇/环中拉出来所必需的。分离应力的大小已被估计，并且发现与测量到的初始屈服应力的增加非常一致中子辐照铜中的屈服应力。(C)1997年Elsevier Science B.V.
Experimental observations related to the initiation of plastic deformation in metals and alloys irradiated with fission neutrons have been analyzed. The experimental results, showing irradiation-induced increase in the upper yield stress followed by a yield drop and plastic instability, cannot be explained in terms of conventional dispersed-barrier hardening because (a) the grown-in dislocations are not free, and (b) irradiation-induced defect clusters are not rigid indestructible Orowan obstacles. A new model called 'cascade-induced source hardening' is presented where glissile loops produced directly in cascades are envisaged to decorate the grown-in dislocations so that they cannot act as dislocation sources. The upper yield stress is related to the breakaway stress which is necessary to pull the dislocation away from the clusters/loops decorating it. The magnitude of the breakaway stress has been estimated and is found to be in good agreement with the measured increase in the initial yield stress in neutron irradiated copper. (C) 1997 Elsevier Science B.V.