HTOG Research Gallery

SEM/TEM micrographs

Fig 1 Alloy failure at a rib extremity in Fe20Cr25Ni steel after 7000 hours at 950ºC. The dark crack-like regions are silica intrusions along the grain boundaries.

Fig 2 Close-up of the internal oxidation zone in standard-grade Sm2(Co,Fe,Zr,Cu)17 magnetic alloy oxidised for 200 hours at 500ºC, showing a samarium-oxide particle and a vein of copper-rich precipitate.

Fig 3 Internal oxidation zone in standard-grade Sm2(Co,Fe,Zr,Cu)17 magnetic alloy oxidised for 200 hours at 500ºC. The black layer is the external iron-oxide scale, the white specks are samarium-oxide particles (created during magnet production) and the dark crack-like regions are copper-rich precipitates.

Fig 4 High resolution TEM micrograph of a carbon filament. The dark particles at the tip are shown to have lattice parameters consistent with metallic Ni viewed along a fcc (110) axis.

Theoretical Predictions

Theoretical Simulation Gallery

This page shows some results of oxidation-driven solute depletion simulations obtained using the Group's ODIN software (see publications page for reference).

Fig 1 Al depletion at the edge of a FeCrAlY sample after 0.1 hours at 1200ºC.

Fig 2 Al depletion at the re-entrant edge of a FeCrAlY sample after 0.1 hours at 1200ºC.

Fig 3 Al concentration in the corner of a 50-micron MCrAlY overlay coating after 5 hours at 1100ºC.

Fig 1 Al depletion around cooling holes through NiCrAl after 1000 hours at 1200ºC (hole separation is approximately 420 microns).

Fig 2 Al concentration in and around a 2D protuberance on a 100-micron MCrAlY coating after 1 hour of oxidation at 1100ºC.