The oxidation of high-temperature intermetallics

Characterization of thermally cycled alumina scales

“…One interesting feature is that, although the entire scale is α-Al 2 O 3 , the outer layer contains numerous voids, while the inner scale is virtually void free, Figure 7b. This voidage appears to mark the boundary between oxide which has transformed from cubic alumina (with the associated volume reduction creating the voids [32]) and oxide which grew as α phase.…”

Influence of the microstructure on the formation of alumina scales on near stoichiometric RuAl produced by arc melting

“…Si, Cr and Al are the main elements, which can form such protective layers. Due to the high thermodynamic stability and slow growth rate of aluminum oxide, the aluminides have the most promising characteristics to satisfy application requirements at about 1000 8C [1,2,[4][5][6].…”

Aluminide Coatings for Power-Generation Applications

“…Further transformation of β to γ' might worsen the surface roughening. Alternatively, it has been suggested that a phase transformation caused macroscopic deformation of cast Ni-35.5at%Al [85] and Ni-34.7at%Al-5.7Pt+Hf during cyclic oxidation testing at 1100°C-1200°C. [86] Moreover, a recent high-temperature XRD study on cast Ni-Al and (Ni,Pt)-Al has indicated that alloys with a L1 0 + γ' structure at room temperature undergo a reversible transformation to single phase β when heated to 1100°C.…”