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A real time synchrotron analysis of the breakdown of the inhibition effect
of the Fe2Al5 layer is reported. Both δ and δ−ζ Fe-Zn
phases grow simultaneously when inhibition is suppressed until the Zn layer
is consummated. Then the δ phase grows at the expense of the δ−ζ phase. The same mechanism is observed both below and above the Zn melting point.
Phase transformations kinetics obey an Arrhenius type law that is not affected
by the liquid or solid state of the Zn layer.
We report on the formation by reactive diffusion of a pure decagonal quasicrystalline film in Al/Co bilayer and multilayer structures of overall composition Al13CO4. We show that this method is highly selective since several stable phases which exist around this composition are never observed. The quasicrystal is not the first reaction product but is obtained as a second reaction step by a peritectoid reaction between Al9Co2 and the remaining cobalt. DSC analysis allows the determination of both the enthalpy of formation of the decagonal quasicrystal (ΔHf = -31500 ± 2000 J/g-atom) and its activation energy of growth (2.6 ± 0.5 eV).
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