Effects of an ion nitriding treatment on the oxidation behaviour of an ODS FeAl alloy

Chan, Chih-Chiang; Huvier, C.; Dinhut, J.F.

doi:10.1016/s0257-8972(02)00746-6

Cited by 7 publications

(11 citation statements)

References 12 publications

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“…[19]. In the present study, only the outer compact layer would have enough nitrogen to form AlN but as its content decreases towards the substrate, the nitride is found diluted in a FeAl / α-Fe matrix, which agrees well with the previous investigation reported in [13]. α-Fe seems to result as a by-product from the reaction of nitrogen with aluminium during the implantation process.…”

Section: 2-oxidationsupporting

confidence: 92%

“…This is thought to occur upon cooling of the specimens since no humps in the oxidation curve were recorded during the test [13]. As mentioned above, the surface after nitridation is plastically deformed (protrusions), which may bring about high stress gradients within the oxide scale upon cooling bringing about the observed detachment.…”

Section: 2-oxidationmentioning

confidence: 96%

“…After the 24 h exposure at 800º C, the weight gains of the nitrided specimens was four- for the latest stage [13], i.e. even 10 times faster than those of nitrided α-iron [17].…”

Section: 2-oxidationmentioning

confidence: 98%

“…After chemical etching, the structure of the nitrided layer is better revealed, with outward growing protuberances as well as grains of submicron size constituting the nitrided layer. The alloy itself shows the alignment of the grains composing this alloy fabricated by powder metallurgy and extruded in the <110> direction [13,16].…”

Section: 1-nitridationmentioning

confidence: 99%

“…Choe [12] employed ion implantation at 150 keV to nitride different Fe 3 Al (with and without Cr, Mo and B) resulting in the formation of AlN, Fe 4 N, CrN and even α-Fe, which enhanced the corrosion resistance to acid media. More recently, the effects of an ion nitriding treatment on the oxidation behaviour of an ODS FeAl alloy have been discussed [13], indicating the formation of AlN and again of α-Fe after the nitridation treatment, the latter element diffusing outwardly upon oxidation to form iron oxides. As a result, the nitridation treatment is concluded not to be beneficial.…”

Section: -Introductionmentioning

confidence: 99%

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Nitridation effects on the oxidation mechanisms of an ods Fe–Al intermetallic alloy

Pedraza¹,

Grosseau-Poussard²,

Dinhut³

2004

Applied Surface Science

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An ODS FeAl intermetallic alloy has been nitrided at low-energy high flux implantation diffusion leading to the formation of hexagonal AlN and α-Fe segregation. Its high temperature behaviour is subsequently evaluated under isothermal oxidation at 800º C. Microscopy techniques (SEM, TEM) will show that nitridation hinders aluminiumoutward diffusion and enhances iron outward diffusion giving rise to a layered structure. 1.-IntroductionUpon the high temperature oxidation of titanium aluminides, TiN and/or Ti 2 AlN subscales have been observed to develop at the substrate/oxide interface [1,2], which sometimes have been referred to provide an effective barrier for outward Al diffusion [3] or to prevent oxygen dissolution in the alloy [4] thus improving their oxidation resistance. When these alloys are nitrided, the same nitrogen containing phases appear [5] but only detrimental effects have been reported to occur compared to non nitrided specimens owing to a lower amount of Al 2 O 3 developed at the top surface [6][7][8].In the case of iron aluminides without oxygen-active elements, their oxidation behaviour is worse in air than in pure oxygen due to internal nitridation below a defective alumina scale [9]. Pint et al. polishing in SiC# 4000 emery paper was performed down to a thickness of about 50 μm. Then, Ar bombardment at 3 keV was carried out in a GATAN PIPS™ (precision ion polishing system) model 691 at different angles. 3.-Results 3.1.-NitridationThe surface of the nitrided specimens appeared to be homogeneous with protrusions at the top surface and remains of porosity. The former seemed to be pinned by yttria

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Section: 2-oxidationsupporting

confidence: 92%

Section: 2-oxidationmentioning

confidence: 96%

“…After the 24 h exposure at 800º C, the weight gains of the nitrided specimens was four- for the latest stage [13], i.e. even 10 times faster than those of nitrided α-iron [17].…”

Section: 2-oxidationmentioning

confidence: 98%

Section: 1-nitridationmentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nitridation effects on the oxidation mechanisms of an ods Fe–Al intermetallic alloy

Pedraza¹,

Grosseau-Poussard²,

Dinhut³

2004

Applied Surface Science

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Plasma-nitriding and characterization of FeAl40 iron aluminide

Zhang

Dong

2015

Acta Materialia

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Evolution of oxide scales on an ODS FeAl intermetallic alloy during high temperature exposure in air

2005

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The oxide dispersion strengthened FeAl Grade 3 intermetallic alloy have been shown to develop a structured oxide scale upon isothermal oxidation between 850 and 950 8C for 24 h. Transmission electron microscopy studies have revealed a top nanoequiaxed alumina, alumina and Fe -Al spinel at the outer, central and internal layers, respectively. At 1000 8C, the spinel phase no longer forms but a columnar alumina layer topped by a nanoequiaxed structure. The role of yttria is negligible at lower temperatures whereas some segregation at the scale/substrate interface and precipitation of YAlO 3 is observed at 1000 8C. q

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Effects of an ion nitriding treatment on the oxidation behaviour of an ODS FeAl alloy

Cited by 7 publications

References 12 publications

Nitridation effects on the oxidation mechanisms of an ods Fe–Al intermetallic alloy

Nitridation effects on the oxidation mechanisms of an ods Fe–Al intermetallic alloy

Plasma-nitriding and characterization of FeAl40 iron aluminide

Evolution of oxide scales on an ODS FeAl intermetallic alloy during high temperature exposure in air

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