Magnetic investigations on irradiation-induced nanoscale precipitation in reactor pressure vessel steels: A first-order reversal curve study
Magnetic investigations on irradiation-induced nanoscale precipitation in reactor pressure vessel steels: A first-order reversal curve study
复制标题
反应堆压力容器钢中辐照诱导纳米级析出的磁学研究：一阶反转曲线研究
DOI：
10.1016/j.jnucmat.2021.152973
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发表时间：
2021
影响因子：
3.1
通讯作者：
L. Almasy
中科院分区：
文献类型：
--
作者：
S. Kobayashi;H. Murakami;T. Yamamoto;G.R. Odette;A. Horvath;A. Feoktystov;L. Almasy
我们研究了不同Cu含量的反应堆压力容器模型合金的磁性能，在中子辐照量达到9×10 19 n cm−2时。与显微硬度随中子注量单调增加不同，主回路矫顽力在较高注量下下降，并且对于Cu含量较高的合金，下降幅度更大。高铜合金的一阶反转曲线（FORC）的测量表明，在中子辐照后，FORC 分布峰的位置向较低矫顽力方向移动，随后略有增加，与沿矫顽力和相互作用场轴的展宽相关。该结果可以通过 Cu 沉淀导致基体中磁性不均匀性的增强以及具有不同矫顽力的局部磁性区域之间的静磁相互作用增强来解释。使用 FORC 的磁性方法可能是一种可能的技术，它可以提供有关中子辐照引起的微观结构变化的深入信息，这是通过传统主磁滞回线的测量无法获得的。
We have investigated magnetic properties for reactor pressure vessel model alloys with variable Cu contents, subjected to neutron irradiation up to a fluence of 9× 10 19 n cm− 2. Unlike a monotonic increase of microhardness with neutron fluence, the major-loop coercivity decreases at a higher fluence and the decrease becomes larger for the alloy containing a higher amount of Cu. The measurements of first-order reversal curves (FORCs) for the high-Cu alloy show that the position of the FORC distribution peak shifts toward a lower coercivity just after neutron irradiation, followed by a slight increase, associated with the broadening along both the coercivity and interaction field axes. The results can be explained by the enhancement of magnetic inhomogeneity in a matrix due to Cu precipitation and an increasing magnetostatic interaction between local magnetic regions with different coercivity. The magnetic method using FORCs can be a possible technique which provides in-depth information on microstructural changes due to neutron irradiation, which is not obtained by measurements of a conventional major hysteresis loop.