Effect of surface roughness on the development of protective Al 2 O 3 on Fe–10Al (at.%) alloys containing 0–10 at.% Cr

Effect of surface morphology on the oxidation behavior of bulk metallic glass

“…It is found that dislocations accelerate the diffusion by almost three orders of magnitude as compared with bulk diffusion [44]. Hence, the acceleration effect of surface roughness on the diffusion process of crystalline materials can be reasonably explained by the increase of grain boundary and dislocation density caused by surface treatment [23,24]. However, for BMGs, the amorphous matrix is homogeneous, through which the diffusionis a collectiveatom-jump process without the existence of "pipe diffusion".…”

“…Uran et al studied the influence of surface roughness on the oxide thickness and residual stress of Fe-Cr-Al alloys, and found that the surface roughness can alter the oxidation sequence of the alloying elements [23]. Zhang et al investigated the effect of alloy surface roughness on the development of protective alumina layer on Fe-Al-Cr alloys and found that a Cr 2 O 3 layer formed more readily on a more cold-worked surface, which often resulted from a rougher surface polish [24].Evans et al studied the effect of surface roughness on the oxidation behavior of the Ni-base superalloy ME3 and reported that by increasing the surface roughness, the weight gain increased [25]. Akhiani et al considered the oxidation behavior of Zircaloy-4 cladding tubes and found that a rougher surface resulted in a higher oxidation weight gain, which was suggested to be caused by the higher surface area exposed to oxidation [26].…”

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

“…Surface with a 0.05-μm roughness surface presented the best oxidation resistance those with a 0.83-μm roughness presented better oxidation resistance than those with a 0.14-μm roughness, probably due to higher surface hardening leading to a faster formation of Al 2 O 3 [56]. Studies conducted on Fe-5Cr-10Al alloys, revealed that cold-worked surfaces increased Fe diffusion towards the surface during the early stages of oxidation and led to the nucleation of iron oxide [57]. Using the same approach, more hematite during the transient stage was found for rougher surfaces.…”

Characterization of Selective Oxidation of Manganese in Surface Layers of Fe–Mn Alloys by Different Analytical Methods

“…So far, it has been reported that reactive elements such as Si, Mn and Al are oxidized on the surface of Fe based alloys on annealing under various conditions. 5,[8][9][10][11] Conventional surface analytical methods such as X-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS) were used in these studies. It has been shown in these studies that the oxide layers of reactive elements like Si and Al cover the surfaces of these Fe based alloys under low partial pressure of oxygen, 5,10) and these oxide layers must change the surface properties of the Fe based alloys.…”

“…If the surface of steel products containing such reactive elements is annealed in atmosphere of various oxygen partial pressures in production lines, oxides with complex morphology are formed on their surfaces depending on the species and amount of alloying elements. [3][4][5][6][7][8] These oxides of alloying elements are considered to influence surface properties which are wettability between solid and liquid, galvanizing characteristics and so on. 9) Therefore, characterization of formation processes of oxides of reactive elements on the surface of Fe based alloys provides information on control of the surface properties of annealed steel products.…”