Fusion reactors, fast breeder reactors, and solar thermal power plants are being developed as power plants with low environmental impact and no resource constraints. Since these power plants operate at high temperature with large-heat transfer, scientists are studying the use of components that use liquid metal (has excellent heat transfer performance) as a coolant.
layer formed on the ODS Fe15Cr7Al alloy and the distribution of its constituent elements. Although it is only 1.28 micrometers thick, about 1/80th the thickness of a human hair, it has an extremely compact structure with uniform distribution of aluminum and oxygen, as shown in Figure 1.
At the same time, the team found that oxides of reactive elements such as Ti, Y, and Zr were formed in the α-Allayer, as shown in Figure 1. This is because the reactive elements that the ODS Fe15Cr7Al alloy holds dispersed as tiny oxide particles in its microstructure have migrated into the layer to form oxides.
Comparison of the microstructure and growth rate of the oxide layer formed by several types of FeCrAl alloys shows that alloys without reactive elements do not form these oxides in the layer, and their layer growth is slow. These elongated oxides of reactive elements act as"oxygen-only diffusion path" that promote layer growth and improve barrier properties .The protective layer must be resistant to exfoliation.
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