Microstructural evolution of Fe22%Cr model alloy under thermal ageing and ion irradiation conditions studied by atom probe tomography

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• 作者：Olesya A. Korchuganova^a ; ^b ; ^{KorchuganovaOA@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Mattias Thuvander^c ; Andrey A. Aleev^a ; ^b ; Sergey V. Rogozhkin^a ; ^b ; Torben Boll^c ; Timur V. Kulevoy^b ; ^a
• 关键词：Atom-probe tomography ; FeCr ; Phase decomposition ; Ion irradiation
• 刊名：Journal of Nuclear Materials
• 出版年：2016
• 出版时间：15 August 2016
• 年：2016
• 卷：477
• 期：Complete
• 页码：172-177
• 全文大小：2257 K

文摘

Nanostructure evolution during ion irradiation of two thermally aged binary Fee22Cr alloys has been investigated using atom probe tomography. Specimens aged at 500 °C for 50 and 200 h were irradiated by 5.6 MeV Fe ions at room temperature up to fluences of 0.3 × 10¹⁵ ions/cm² and 1 × 10¹⁵ ions/cm². The effect of irradiation on the material nanostructure was examined at a depth of 1 μm from the irradiated surface. The analysis of Cr radial concentration functions reveals that dense α′-phase precipitates in the 200 h aged alloy become diffuse and thereby larger when subjected to irradiation. On the other hand, less Cr-enriched precipitates in the alloy aged for 50 h are less affected. The CreCr pair correlation function analysis shows that matrix inhomogeneity decreases under irradiation. Irradiation leads to a decrease in the number density of diffuse clusters, whereas in the case of well-developed precipitates it remains unchanged.