3. Solid-state nitrogen transfer
3.1 Binary system Fe–N
The fact that the iron nitrides ε – Fe2N1-x and γ′ - Fe4N1-x exhibit an extended compositional range (approx. 0.15 wt.% for γ′ and approx. 4 wt.% for ε at 570°C) explains why the ε/γ′ configuration, on the α diffusion layer in a binary system, presents a succession of planar interfaces whose displacement (layer growth) is governed by the volume diffusion of nitrogen atoms in the ε, γ′ and α phases. Figure
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Solid-state nitrogen transfer
Conclusion
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