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arXiv 2108.09224cond-mat.mtrl-sci
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质子辐照钢中加速沉淀的表征

Characterizing accelerated precipitation in proton irradiated steel

Mark Laver, Brian J. Connolly, Christopher Cooper, Joachim Kohlbrecher, Stavros Samothrakitis, Keith Wilford

摘要:

离子辐照为研究裂变和聚变反应堆工厂材料的辐射效应提供了中子试验的一种有前途的替代方法。在这里,我们表明质子辐照可以定量地重现沉淀,导致反应堆压力容器钢脆化,剂量率比裂变反应堆运行中经历的高10,000倍。小角中子散射(SANS)是用来表征沉淀物的尺寸分布在含铜钢辐照的平均剂量约。7 mdpa,5 MeV质子。将我们的结果与文献中关于反应堆压力容器钢中至少含有1at.%镍的沉淀物体积分数随剂量率的变化符合幂律规律,其指数为0.25- 0.30,剂量率对沉淀物体积分数的影响在6个数量级以上。结合剂量率,碳被确定为在确定沉淀物尺寸方面发挥主导作用,增加了镍,锰和辐照温度的已知影响。我们讨论了从SANS推断的沉淀物的组成,考虑到以前的原子探针断层扫描研究。

英文摘要:

Ion irradiation provides a promising substitute to neutron tests for investigating the effects of radiation on materials for fission and fusion reactor plants. Here we show proton irradiation can quantitatively reproduce precipitation that leads to embrittlement in reactor pressure vessel steels, at dose rates 10,000 times greater than experienced in fission reactor operation. Small-angle neutron scattering (SANS) is used to characterize precipitate size distributions in copper-containing steels irradiated to average doses of approx. 7 mdpa with 5 MeV protons. Comparing our results with the literature on reactor pressure vessel steels containing at least 1 at.% nickel, we find a power-law scaling of dose with exponent 0.25--0.30 accounts for the effects of dose rate on precipitate volume fraction over 6 orders of magnitude in dose rate. In conjunction with dose rate, carbon is identified as performing a leading role in determining precipitate sizes, adding to the known effects of nickel, manganese and irradiation temperature. We discuss the composition of precipitates inferred from SANS, taking previous atom probe tomography studies into consideration.

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