Defect formation processes in Fe-Cr-Ni alloys by neutron irradiation under thermal cycles
Defect formation processes in Fe-Cr-Ni alloys by neutron irradiation under thermal cycles
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热循环下中子辐照 Fe-Cr-Ni 合金缺陷形成过程
DOI：
10.2320/matertrans1989.38.836
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Yoshiie
中科院分区：
文献类型：
--
作者：
Qiu Xu;N. Yoshida;T. Yoshiie
据报道，循环温度变化对 Fe-Cr-Ni 合金辐射诱导显微组织演化的影响非常强烈且复杂。为了理解这些结果，基于缺陷聚类的速率理论对不同温度辐照下的缺陷累积进行了数值计算。结果表明，不同温度照射下的微观结构演变如下。当温度从低到高改变时，由于低温照射期间形成的小空位簇与高温照射产生的间隙原子发生反应而分解，因此出现空位主导状态。因此，间隙簇收缩，而空位簇通过吸收多余的空位而增长。另一方面，在温度从高变低的情况下，在整个照射期间保持间隙为主的条件，因此间隙团簇生长，而空位团簇收缩。在循环温度辐照中，大的间隙和空位团簇很难形成，因为这些团簇在温度周期性变化的过程中反复生长和收缩。
It had been reported that the effects of cyclic temperature change on the radiation induced microstructural evolution in Fe-Cr-Ni alloys were very strong and complicated. In order to understand these results, accumulations of defects under varying temperature irradiations were numerically calculated based on the rate theory for defect clustering. The results indicate the microstructural evolution under varying temperature irradiation as follows. Vacancy-predominant condition appears after changing the temperature from low to high due to the decomposition of small vacancy clusters, which had formed during the low temperature irradiation, by reacting with interstitials produced by the irradiation at the high temperature. Interstitial clusters, therefore, shrink, while vacancy clusters grow by absorbing the excess vacancies. In the case of temperature change from high to low, on the other hand, the interstitial-predominant condition is held throughout the whole irradiation period, and hence interstitial clusters grow, while vacancy clusters shrink. In the cyclic temperature irradiation, the large interstitial and vacancy clusters are difficult to be formed because these clusters grew and shrank repeatly during the temperatures changed periodically.