Analysis of pore formation at oxide-alloy interfaces--I.Experimental results on FeAl

摘要: Pores, or voids, at oxide-alloy interfaces are commonly observed after high temperature oxidation when the alloy does not contain a reactive element. In order to under stand pore-nucleation and growth processes, density, size depth of interfacial pores on Fe-40 at. %Al as function time 1000degreesC were examined. Scanning-electron microscopy (SEM) atomic force (AFM) used characterize removal surface Al2O3 scale. The nucleation was most rapid during initial stage where cation-transported-alumina dominates. Pore involves widening well deepening, deepening rate is slower for larger pores. Growth accomplished by aluminum evaporation similar to20 min diffusion before that time. shape within an grain stays constant dictated balance interface energies.