Amorphous precipitates in a crystalline matrix; precipitation of amorphous Si3N4 in α-Fe

Mittemeijer, E. J.; Biglari, M. H.; Böttger, A.; Pers, N. M. van der; Sloof, W.G.; Tichelaar, F.D.

doi:10.1016/s1359-6462(99)00143-8

Cited by 38 publications

(44 citation statements)

References 7 publications

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“…EPMA measurements showed that the average ratio of Si/N was 0.76 ± 0.06 to be compared with the expected 0.75 of stoichiometric Si 3 N 4 [4]. They also showed that the chemical shift of Si-Ka line matched those of crystalline bulk Si 3 N 4 [4].…”

Section: Silicon Nitride Precipitation During Nitriding At 570°cmentioning

confidence: 76%

“…This amorphous structure has been evidenced notably by electron diffraction as well as high resolution TEM (HRTEM) [4,6] and there is no contradictory observation in the available literature. The unusual aspect of the observation however calls for additional experimental evidence acquired through an independent technique, in order notably to discard any possibility of amorphization during the preparation of samples for observation, as raised by Tomio et al [24].…”

Section: Silicon Nitride Precipitation During Nitriding At 570°cmentioning

confidence: 96%

“…The composition of these precipitates has also been investigated through various approaches both direct and indirect [4,6]. EPMA measurements showed that the average ratio of Si/N was 0.76 ± 0.06 to be compared with the expected 0.75 of stoichiometric Si 3 N 4 [4].…”

Section: Silicon Nitride Precipitation During Nitriding At 570°cmentioning

confidence: 99%

“…These phases were identified as a-Si 3 N 4 and b-Si 3 N 4 , both well known in bulk silicon nitride, although a is said to have a fraction of its nitrogen substituted with oxygen depending on experimental conditions. In much more recent research, it has been shown that during nitriding at 570-580°C, silicon nitride precipitates abundantly in FeSi binary alloys in fine stoichiometric Si 3 N 4 precipitates [1,[4][5][6]. These nanoprecipitates display the odd combination of an amorphous structure with a cuboidal morphology.…”

Section: Introductionmentioning

confidence: 99%

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Competitive precipitation of amorphous and crystalline silicon nitride in ferrite: Interaction between structure, morphology, and stress relaxation

et al. 2015

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Section: Silicon Nitride Precipitation During Nitriding At 570°cmentioning

confidence: 76%

Section: Silicon Nitride Precipitation During Nitriding At 570°cmentioning

confidence: 96%

Section: Silicon Nitride Precipitation During Nitriding At 570°cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Competitive precipitation of amorphous and crystalline silicon nitride in ferrite: Interaction between structure, morphology, and stress relaxation

et al. 2015

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“…This is original, as far as we know. Another example of glass precipitation (Si 3 N 4 ) in a crystalline matrix (Fe) has been published [26] but no order appears at all. The samples that we have synthesized are monocrystals of CuMeO 3 type (with Me = Ge or Si) with orthorhombic crystalline structure containing germania-silica glass fibers (Ge 0,7 Si 0,3 )O 2 .…”

Section: Resultsmentioning

confidence: 99%

Elaboration of a Specific Class of Metamaterial: Glass in Single Crystal

Poumellec¹,

Lancry²,

Ani-Joseph³

et al. 2012

Crystallization and Materials Science of Modern Artificial and Natural Crystals

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Nitriding of White‐Solidified Fe–C–Si Alloys: Diffusion Path Concept Applied to Inhomogeneous Microstructures

2021

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Gray-solidified cast irons are frequently used to manufacture machine and engine parts due to their low cost, good compressive strength, and high damping capacity. [1,2] Their use is, however, often limited by poor surface hardness and corrosion resistance. Both can be notably improved by a duplex surface treatment developed in recent years. [3][4][5][6] First, the surface of the cast iron is remelted, e.g., by an electron beam or plasma arc. This produces a white-solidified, ledeburitic [7,8] surface layer, which is hard and abrasion-resistant. Afterward, the material is nitrided to enhance the corrosion resistance by the formation of a dense surface layer composed of the main Fe (carbo)nitrides, γ 0 -Fe 4 (N,C) and ε-Fe 3 (N,C) 1þx (Table 1), denoted compound layer. Note that nitriding without remelting leads to less favorable microstructures because coarse graphite particles contained in gray-solidified cast irons are detrimental to the compound layer formation. [3,4,[9][10][11] Although the general advantages of the previously described duplex treatment have been demonstrated, the nitriding behavior of the white-solidified surface layers turns out to be complex and incompletely understood. [12][13][14][15][16][17][18][19] The research of the current authors [12,18,19] aims at elucidating the complex nitriding behavior of the remelted surface layers by controlled gas nitriding of white-solidified Fe-3.5 wt% C-0/1.5/3 wt% Si alloys, serving as model alloys for commercially available ferritic cast iron grades subjected to remelting and nitriding. Note that, in contrast to ferritic cast irons, pearlitic cast irons often contain non-negligible additions of Mn and Cu, which may additionally affect the nitriding behavior. [17] The microstructure of white-solidified Fe-3.5 wt% C-1.5/3 wt% Si alloys, having C and Si contents typical of cast irons, is mainly composed of coarse eutectic cementite plates, θ-Fe 3 C 1Àz (Table 1), embedded in ferrite and pearlite. [20,21] The latter result from the decomposition of primary and eutectic γ-Fe during cooling after solidification. In addition, a minor volume fraction of Fe 23 Si 5 C 4 -type silicocarbide (Table 1) is contained in the alloys. [22][23][24] The distribution of Si in the white-solidified microstructure is very heterogeneous. The Si/Fe atomic ratio in the eutectic and pearlitic θ is u Si,θ < 3 Â 10 À4 and, here, considered negligible, say u Si,θ ! 0. [12] The Si/Fe atomic ratio in Fe 23 Si 5 C 4 is u Si,Fe 23 Si 5 C 4 % 0.22; however, it might take also values slightly different from 0.22 due to a possibly mixed Fe/Si site [23,24] and extended lattice defects affecting the composition. [22] The Si content in α-Fe relates to the Si content of γ-Fe, which is affected by Si segregation during solidification. The Si content in the center of γ-Fe dendrites is typically similar to the Si content of the alloy, while the outer rim of dendrites and last-to-freeze regions are enriched in Si. [25] The Si content in eutectic γ-Fe is higher

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Amorphous precipitates in a crystalline matrix; precipitation of amorphous Si3N4 in α-Fe

Cited by 38 publications

References 7 publications

Competitive precipitation of amorphous and crystalline silicon nitride in ferrite: Interaction between structure, morphology, and stress relaxation

Competitive precipitation of amorphous and crystalline silicon nitride in ferrite: Interaction between structure, morphology, and stress relaxation

Elaboration of a Specific Class of Metamaterial: Glass in Single Crystal

Nitriding of White‐Solidified Fe–C–Si Alloys: Diffusion Path Concept Applied to Inhomogeneous Microstructures

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