The mechanism of radiation-induced segregation in ferritic–martensitic alloys
The mechanism of radiation-induced segregation in ferritic–martensitic alloys
复制标题
DOI：
10.1016/j.actamat.2013.09.049
复制
发表时间：
2014-02
期刊：
影响因子：
9.4
通讯作者：
J. Wharry;G. Was
中科院分区：
文献类型：
--
作者：
J. Wharry;G. Was
使用逆柯肯德尔机制对 Fe-Cr 合金中辐射引起的偏析机制进行了建模，并与一系列温度、块体 Cr 成分和辐照剂量下的实验测量结果进行了比较。该模型表明，在很大的温度范围内，铬通过间隙迁移在汇处富集，而在非常高的温度下，铬通过与空位通量相反的扩散而被耗尽。实验结果和模型预测在偏析的温度依赖性以及从富铬到贫铬的交叉方面具有良好的定性和定量一致性。逆柯肯德尔机制也与实验结果一致，实验结果观察到随着整体 Cr 成分的增加，Cr 富集量减少。溶质阻力的影响是在逆柯肯德尔框架内建模的，但无法解释从 Cr 富集到 Cr 耗尽的交叉或实验中测量的偏析程度。
The mechanism of radiation-induced segregation in Fe–Cr alloys was modeled using the inverse Kirkendall mechanism and compared to experimental measurements over a range of temperatures, bulk Cr compositions, and irradiation dose. The model showed that over a large temperature range chromium was enriched at sinks by interstitial migration, and at very high temperatures it was depleted by diffusing opposite to the vacancy flux. Experimental results and model predictions were in good qualitative and quantitative agreement with regard to the temperature dependence of segregation and the crossover from Cr enrichment to Cr depletion. The inverse Kirkendall mechanism was also in agreement with experimental findings that observed a decreasing amount of Cr enrichment with increasing bulk Cr composition. The effects of solute drag were modeled within the inverse Kirkendall framework, but were unable to account for either the crossover from Cr enrichment to Cr depletion or the magnitudes of segregation measured in experiments.