SANS investigation of microstructure evolution in high chromium ODS steels after thermal ageing

A combined APT and SANS investigation of α′ phase precipitation in neutron-irradiated model FeCrAl alloys

“…Changes in the scattering intensity are clearly observed both for increasing alloy Cr content with constant dose and for increasing irradiation dose with constant alloy composition. These intensity trends are similar to those seen in other SANS investigations of α precipitation in aged FeCrAl alloys and irradiated FeCr alloys by several authors [14,22,32,33,57,58]. This qualitative agreement validates our use of the spherical exclusion model to assess α precipitation in the SANS data.…”

Radiation tolerance of neutron-irradiated model Fe–Cr–Al alloys

“…The Cr-rich α' phase has been notoriously difficult to image using conventional electron microscopy techniques because α' is coherent with the α matrix. Therefore, SANS was conducted to determine the size and number density of α' within the irradiated alloys, as it has been Page 10 successfully used previously to quantify α' precipitation in the irradiated Fe-Cr system [31,52,53] and has seen limited use in thermally aged Fe-Cr-Al alloys [54,55]. Table 3 summarizes the calculated volume fraction, size, and number density of the α' precipitates based on the best-fit model applied in Figure 4.…”

Thermodynamic and kinetic modeling of oxide precipitation in nanostructured ferritic alloys

“…Fig. 3 compares the precipitate volume fraction in a large number of NFAs with varying Ti and Y contents as measured by SANS [2,7,[11][12][13]48,[51][52][53][54] with the equilibrium volume fractions of oxide phases predicted by the thermodynamic model for the same alloys, using the given nominal alloy compositions. For cases where it was explicitly stated in the experimental methods that only the Y and Y-Ti oxides are included in the reported volume fractions [2,11,12], the predicted values include only these phases as well.…”