首页|The effect of grain refinement on the oxidation and phase transformation of alumina scale on Ni2Al3 coating
The effect of grain refinement on the oxidation and phase transformation of alumina scale on Ni2Al3 coating
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NSTL
Elsevier
An ultrafine-grained (UFG) and coarse-grained (CG) Ni2Al3 coating were prepared by aluminizing pure nickel substrate with and without nanocrystalline Ni film using an aluminization pack cementation process at 620 degrees C for 5 h. The oxidation kinetics and cyclic oxidation result show that the UFG-Ni2Al3 coating significantly enhances the oxidation-resistant with respect to the CG-Ni2Al3 coating in air at 900 degrees C. The SEM/EDS results confirmed that the microstructure of two 8-Ni2Al3 coatings is free of pores, cracks, and voids. The UFG-Ni2Al3 coating promotes the phase transformation with respect to the CG-Ni2Al3 coating after oxidation for various times were investigated by using photo-stimulated luminescence spectroscopy (PSLS) analysis. The experimental result also confirmed that the UFG-Ni2Al3 coating, on which an adherent alumina scale grew, can significantly control the formation of cavities at the scale/coating interface.
Ni 2 Al 3 coatingGrain refinementSEMTEMRaman spectroscopyOxidationAlumina scale formationNICKEL-ALUMINIDETEMPERATURE OXIDATIONTHETA-ALPHA-AL2O3 TRANSFORMATIONNI-CEO2 FILMBEHAVIORDIFFUSIONALPHA-AL2O3GROWTHNIINTERDIFFUSION
Khan, A.、Ullah, Ihsan、Shah, S. S. A.、Zhang, S. H.、Song, G. S.、Ullah, A.
NSTL
Elsevier
