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arXiv 1409.6799cond-mat.mtrl-sci
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Fe及Fe基合金在原位电子辐照下的辐照软化

Radiation-induced softening of Fe and Fe-based alloys during in-situ electron irradiation under mechanical testing

V. I. Dubinko, D. Terentyev, A. N. Dovbnya, V. A. Kushnir, I. V. Hodak, S. V. Lebedev, S. A. Kotrechko, A. V. Dubinko

摘要:

在辐照下形成的缺陷作为额外的钉扎中心,导致众所周知的辐射诱导硬化效应。另一方面,有一个鲜为人知的,但公认的效果,即时和可逆的软化金属受到各种类型的照射。这种辐射软化效应在辐射效应理论和工程技术应用中都应予以考虑。本文对多晶工业纯铁(0.048%C)和工业铁素体钢的RIS进行了实验研究。比较了电子束对体心立方Fe和面心立方Al(99.5%)的塑性形变的影响。电子能量范围为0.5至0.8 MeV。的屈服应力和辐射诱导的断裂伸长率的减少的可逆下降测量作为电子电流和试样厚度的函数。率理论的RIS提出,它考虑到辐射诱导的运动离散呼吸子(DBs)的激发,最近被证明存在于bcc铁,和它们的相互作用与位错增强unpinning从结构缺陷。使用经典的MD模拟提供输入的修改后的速率理论,最终证明了一个合理的协议与实验数据的DBs的行为进行了研究。结果的相关性的压力容器钢的反应器中的行为进行了讨论。

英文摘要:

Defects formed under irradiation in the bulk act as additional pinning centers resulting in the well-known effect of radiation-induced hardening. On the other hand, there is a poorly understood but well-established effect of instant and reversible softening of metals subjected to various types of irradiation. This radiation-induced softening (RIS) effect should be taken into account both in the theory of radiation effects and in the engineering approach for technological applications. In the present paper, the RIS is investigated experimentally in polycrystalline technically pure iron (0.048%C) and in commercial ferritic steel. The effect of the electron beam on plastic deformation of bcc Fe is compared with that in fcc Al (99.5%). Electron energy ranged from 0.5 to 0.8 MeV. Reversible drop of the yield stress and radiation-induced reduction of the elongation to fracture are measured as functions of the electron current and specimen thickness. Rate theory of RIS is proposed, which takes into account the radiation-induced excitation of moving discrete breathers (DBs), recently proven to exist in bcc Fe, and their interaction with dislocations enhancing unpinning from structural defects. The behavior of the DBs is studied using classical MD simulations providing input for the modified rate theory, which eventually demonstrates a reasonable agreement with experimental data. The relevance of results to the in-reactor behavior of pressure vessel steels is discussed.

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