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Microstructural evolution of Fe-22%Cr model alloy under thermal ageing and ion irradiation conditions studied by atom probe tomography

Olesya A. Korchuganova ; Mattias Thuvander (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Andrey A. Aleev ; Sergey V. Rogozhkin ; Torben Boll (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Timur V. Kulevoy
Journal of Nuclear Materials (00223115). Vol. 477 (2016), p. 172-177.
[Artikel, refereegranskad vetenskaplig]

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 ?m from the irradiated surface. The analysis of Cr radial concentration functions reveals that dense ??-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.

Nyckelord: Atom-probe tomography; Fe-Cr; Ion irradiation; Phase decomposition



Denna post skapades 2016-07-06. Senast ändrad 2016-08-10.
CPL Pubid: 239086

 

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Institutioner (Chalmers)

Institutionen för fysik, Materialens mikrostruktur (Chalmers)

Ämnesområden

Teknisk fysik

Chalmers infrastruktur