The effect of flux on ion irradiation-enhanced precipitation in AISI-316L: An in-situ TEM study
The effect of flux on ion irradiation-enhanced precipitation in AISI-316L: An in-situ TEM study
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DOI：
10.1016/j.jnucmat.2020.152414
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发表时间：
2020-12-01
影响因子：
3.1
通讯作者：
Donnelly, Stephen E.
中科院分区：
文献类型：
--
作者：
Oyarzabal, Italo M.;Tunes, Matheus A.;Donnelly, Stephen E.
AISI 316L 不锈钢薄箔在透射电子显微镜 (TEM) 中用 325 keV Xe 离子在 550 摄氏度下以三种不同的通量进行原位辐照，以研究通量效应。辐射增强沉淀（REP）的动力学和沉淀的演变被发现与辐照通量相关。在较低通量（1 和 2 x 10(12)ions.cm(-2).s(-1)）下，级联混合在奥氏体基体内点缺陷的积累中发挥了重要作用，促进了簇的形成，这些簇充当了高面密度沉淀物异质形核的汇。在最高通量 (4 x 10(12)ions.cm(-2).s(-1)) 下，级联混合有利于空位和间隙的重组，从而抑制现有沉淀物的生长超过一定的总损伤水平。结果与 Wiedersich、Okamoto 和 Lam 提出并由 Bruemmer 进一步研究的辐射增强降水模型一致，但当通量接近空位-间隙复合极限时，提出了一个小的修改。 (C) 2020 Elsevier B.V. 保留所有权利。
Thin foils of AISI 316L stainless steel were irradiated in-situ in a transmission electron microscope (TEM) with 325 keV Xe ions at 550 degrees C at three different fluxes to study flux effects. The kinetics of the radiation-enhanced precipitation (REP) and the evolution of the precipitates were found to be correlated with the irradiation flux. At lower fluxes (1 and 2 x 10(12) ions.cm(-2).s(-1)), cascade mixing played an important role in the accumulation of point defects within the austenite matrix, facilitating the formation of clusters which act as sinks for heterogeneous nucleation of precipitates with high areal density. At the highest flux (4 x 10(12) ions.cm(-2).s(-1)) the cascade mixing favours the recombination of vacancies and interstitials which supresses the growth of existing precipitates beyond a certain total damage level. The results agree with a previous radiation-enhanced precipitation model proposed by Wiedersich, Okamoto and Lam and further studied by Bruemmer, but a small modification is proposed when the flux is close to the vacancy-interstitial recombination limit. (C) 2020 Elsevier B.V. All rights reserved.