Concepts derived from phase diagram studies for the strengthening of Fe–Al-based alloys

Palm, Martin

doi:10.1016/j.intermet.2004.10.015

Cited by 222 publications

(100 citation statements)

References 63 publications

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“…[17][18][19] This is probably the reason why the application of ferritic ODS steels dominates. [15][16][17][18][19][20][21][22][23] The new ODS alloys consist of a ferritic Fe-Al matrix strengthened with about 6 to 10 % volume fractions of Al 2 O 3 particles. 24,25 In order to get a more detailed insight into these new groups of materials, an experimental programme was carried out to better understand their processing behaviour and their operational properties.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of new ODS alloys under single and multiple deformation

Mašek¹,

Khalaj²,

Nový³

et al. 2016

Mater. Tehnol.

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The application of innovative processing techniques to conventional raw materials can lead to new structural materials with specific mechanical and physical properties, which open up new possibilities of use in some areas of industry. The processing is enabled by powder metallurgy, which utilizes powders consisting of a metal matrix with dispersed stable particles achieved by mechanical alloying and their hot consolidation by rolling. New oxide dispersion strengthened (ODS) Fe-Al-based alloys are tested under different single and multiple thermomechanical treatments at different temperatures. The results show that new ODS alloys are significantly affected by the thermo-mechanical treatment, leading to microstructural changes. Their analysis is performed using different analytical methods such as optical microscopy, scanning electron microscopy and X-ray diffraction analysis. Keywords: ODS alloys, composite, steel, Fe-Al Uporaba inovativnih tehnik preoblikovanja na obi~ajnih materialih lahko privede do novih konstrukcijskih materialov s specifi~nimi mehanskimi in fizikalnimi lastnostmi, ki odpirajo nove mo`nosti uporabe v industriji. Metalurgija prahov omogo~a uporabo prahov s kovinsko osnovo z dispergiranimi stabilnimi delci, ki jih dobimo pri mehanskem legiranju in vro~i konsolidaciji z valjanjem. Nove zlitine Fe-Al, disperzijsko utrjene z oksidi (ODS), so bile preizku{ene pri razli~ni, eno-ali ve~stopenjski obdelavi pri razli~nih temperaturah. Rezultati ka`ejo, da ima termomehanska obdelava novih ODS zlitin mo~an vpliv, ki se vidi v spremembah mikrostrukture. Analiza je bila izvedena s pomo~jo razli~nih analitskih metod, kot so: svetlobna mikroskopija, vrsti~na elektronska mikroskopija in rentgenska difrakcijska analiza.

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Section: Introductionmentioning

confidence: 99%

Behaviour of new ODS alloys under single and multiple deformation

Mašek¹,

Khalaj²,

Nový³

et al. 2016

Mater. Tehnol.

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“…Through the addition of suitable alloying element (in this case, for example, titanium), it is achieved that the transition temperature T C (transition from D0 3 to B2 lattice) is shifted to higher values than the binary diagram Fe-Al indicates. Thereby the existence of D0 3 structure is extended [6].…”

Section: Introductionmentioning

confidence: 98%

“…Suitable alloying element for this type of reinforcement is, for example, chromium or silicon. Chromium is dissolved in the Fe-Al matrix up to 50 at.%, and no other secondary phases can form [6].…”

Section: Introductionmentioning

confidence: 99%

“…Miscibility gap allows the formation of coherent precipitates with strong reinforcement effect. The coherent precipitates can be observed for example in the systems Fe-Al-V, Fe-Al-Ni, Fe-Al-Ti or Fe-Al-Ta [6][7][8]. Iron aluminides appear as ideal materials for high--temperature applications (and possible substitute for P91, P92 type stainless steels) due to their excellent resistance to high-temperature oxidation and corrosion.…”

Section: Introductionmentioning

confidence: 99%

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The influence of ternary alloying element in iron aluminides on coefficient of thermal expansion

Švec¹,

Kejzlar²

2016

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The iron aluminides appear as suitable materials with many advantages for use in high--temperature applications. However, a sharp drop in their strength above 600• C and limited ductility at room temperature are the major obstacles to their mass expansion. There are several possibilities how to improve these negative properties. One possibility is alloying of binary alloys by another element.The main aim of present work is to evaluate the effect of different alloying elements on the coefficient of thermal expansion with respect to phase composition and structure. Generally, the high mechanical temperature properties are affected by alloy structure, and the same could be supposed for the coefficient of thermal expansion (CTE). In this paper, there were studied Fe-26Al-2X (X = Cr, Si, Ta, Zr) alloys. Structure and phase composition were evaluated by SEM, EDX, and EBSD. The CTE's were examined in a temperature range 460-1200Precipitates of ternary phases can beneficially affect the CTE's values. The lowest and most stable CTE was observed for iron aluminide with Ta-addition.K e y w o r d s : iron aluminides, Fe3Al, structure, coefficient of thermal expansion (CTE)

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“…Iron aluminide-based intermetallic alloys are attractive materials for industrial applications at medium to high temperatures due to their unique properties, which are generally ascribed to their long-range ordered (LRO) crystal structures (Ref [1][2][3][4]. Consequently, they exhibit relatively good mechanical properties, relatively low density (5.56 g/cm 3 for the FeAl phase), excellent corrosion resistance (as a result of their ability to create a highly protective Al 2 O 3 layer), and low cost.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite Fe-Al Intermetallic Coating Obtained by Gas Detonation Spraying of Milled Self-Decomposing Powder

Senderowski

2014

J Therm Spray Tech

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The nanocomposite structure of Fe-Al intermetallic coating, created in situ during gas detonation spraying (GDS) of as-milled self-decomposing powder and containing disordered 8 nm FeAl nanocrystals, was analyzed using scanning electron microscopy (SEM) with energy-dispersive x-ray (EDX) spectroscopy, transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and x-ray diffraction methods. It is found that the Fe-Al coating is characterized by a sublayer morphology consisting of flattened and partially melted splats containing a wide Al range from about 26 to 52 at.%, as well as Al 2 O 3 oxides, created in situ at the internal interfaces of splats during the GDS process. The complex oxide films, identified as amorphous Al 2 O 3 , which are formed in the nanocrystalline Fe-Al matrix of the GDS coating behave like a composite reinforcement in the intermetallic Fe-Al coating. The combined presence of nanosized subgrains in the Fe-Al matrix and the Al 2 O 3 nanoceramic dispersoids significantly increases the microhardness of the coating.

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Concepts derived from phase diagram studies for the strengthening of Fe–Al-based alloys

Cited by 222 publications

References 63 publications

Behaviour of new ODS alloys under single and multiple deformation

Behaviour of new ODS alloys under single and multiple deformation

The influence of ternary alloying element in iron aluminides on coefficient of thermal expansion

Nanocomposite Fe-Al Intermetallic Coating Obtained by Gas Detonation Spraying of Milled Self-Decomposing Powder

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