Primary recrystallization in an ODS FeAl alloy: an effective way to modify texture and microstructure

Grosdidier, Thierry; Suzon, E.; Wágner, F.

doi:10.1016/j.intermet.2004.03.014

Cited by 30 publications

(40 citation statements)

References 28 publications

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“…Carbides, borides, nitrides and oxides nano-particles are usually used as modifiers in order to both improve a mictrostructure of actually existed cast materials as well as to create a new materials design [1][2]6,[10][11]. In practice, the choice of modifiers is related to economic reasons and ease of performing the procedure modification.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique

Łazińska¹,

Durejko²,

Polkowski³

2017

Archives of Metallurgy and Materials

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Results of the first principle study on a fabrication of FeAl intermetallic based alloy with an addition of nanometric αAl 2 O 3 (n-Al 2 O 3 ) particles by the LENS method and a subsequent characterization of the as received materials' structure and properties, are shown in the present work. A series of samples were manufactured using LENS technique while a control of temperature and the size of melted metal pool.The presence of ceramics nanoparticles was not directly confirmed by microscopy observations. Neither aluminum nor oxygen content was not elevated in the material with n-Al 2 O 3 content. Although, indirect methods revealed influence of n-Al 2 O 3 addition on the manufactured elements structure. Analyses of porosity has shown that addition of 2% vol. n-Al 2 O 3 significantly decreases this feature (~1%), as compared to the reference material made of pure FeAl intermetallic alloy (~5%). The addition of n-Al 2 O 3 causes an increase of grain size in Fe40Al intermetallic alloy. An oxidation resistance has been also improved what was associated to the n-Al 2 O 3 addition. Four times lower increase of samples mass was noticed for sample with the n-Al 2 O 3 addition as compared to the pure Fe40Al intermetallic alloy.

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Section: Introductionmentioning

confidence: 99%

The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique

Łazińska¹,

Durejko²,

Polkowski³

2017

Archives of Metallurgy and Materials

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“…The considerable and drastic difference in grain size between the two zones is consistent with a recrystallization mechanism, because it has been demonstrated that: (1) this oxide-dispersionstrengthened (ODS) FeAl alloy is known to exhibit abnormal grain growth at temperatures above 1200°C to 1300°C [32][33][34] and (2) even a 10 to 20 pct deformation can also trigger significant structural evolution at a temperature as low as 1000°C. [24] This effect must be enhanced here, due to the limited efficiency of grainboundary pinning by the dispersed oxide particles. It is, indeed, clear from the micrograph in Figure 5(a) that the oxide particles did not completely precipitate out from the matrix and that their number is much lower than that usually obtained in this alloy.…”

Section: B Various Formation Mechanisms Of the Grainsmentioning

confidence: 99%

“…[7,11,22] The Y 2 O 3 was introduced at the milling stage, to create strengthened powder particles by fine Y 2 O 3 dispersions that can pin grain boundaries under subsequent processing and use. [23,24] The Y 2 O 3 particles decomposed and dissolved into the supersaturated FeAl matrix during the milling procedure. [14] as was also observed in steels.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of a High-Velocity Oxy-Fuel Thermal-Sprayed Nanostructured Coating Obtained from Milled Powder

Grosdidier

Morniroli

2007

Metall Mater Trans A

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The mechanisms responsible for the different types of microstructure present in a nanostructured coating prepared by high-velocity oxy-fuel (HVOF) spraying of the Y 2 O 3 -reinforced milled FeAl powder have been established. Nano-and microsized grains were present both in the melted splats and the retained unmelted powder particles. In the unmelted powder particles, equiaxed grains formed by recrystallization from the heavily deformed and disordered structure present in the initial powder. Their size was controlled by the degree of advancement of the recrystallization process and the larger grains contained ribbonlike antiphase boundaries (APBs) separating large, ordered domains. In the melted zones, the grain size (and shape) was controlled by the local efficiency of the heat extraction during solidification. The Al evaporation during thermal spraying led to a modification of the local chemistry that resulted in the formation of the Fe 3 Al and FeAl phases containing fine networks of APBs. These APBs formed by sequential ordering from the high-temperature disordered FeAl phase that formed from the melt. Despite the high-temperature processing and recrystallization processes, both the melted and unmelted zones contained dislocations that result from residual stresses as well as from peening by the powder particles during spraying.

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“…The wide applications of the FeAl intermetallics are limited by two key problems: eliminating the pores caused by the Kirkendall effect (due to the different diffusion rates of Fe and Al) during the sintering procedure [2][3][4] and improving the ductility and creep resistance at ambient temperatures [5]. In spite of the recent advances in improving brittleness at ambient temperatures and creep resistance by controlling the microstructure, such as grain boundary strengthening, oxide dispersion strengthening, and grain refinement [6][7][8][9][10], industry applications of these alloys are still limited.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of porous Fe–25 wt.% Al alloy with controllable pore structure

Shen

Song

et al. 2010

Powder Metall Met Ceram

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UDC 621.762Porous Fe-25 wt.% Al alloy is synthesized by reactive synthesis with Fe and Al powders as the raw materials. Various processing parameters such as the final sintering temperature, pressure during cold pressing, and powder size are investigated to control the pore structure of the alloy. It has been shown that the optimal final sintering temperature is around 950-1050°C. When the pressure is higher than 110 MPa, the variation of the pore structure is mainly caused by the change of the pore nature in the as-pressed compact. In addition, the pore structure of porous Fe-25 wt.% Al alloys depends on the size of the raw powders and the weight fraction of different-sized raw powders.Кeywords: intermetallics, powder metallurgy, iron aluminides, porous material.

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Primary recrystallization in an ODS FeAl alloy: an effective way to modify texture and microstructure

Cited by 30 publications

References 28 publications

The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique

The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique

Microstructure of a High-Velocity Oxy-Fuel Thermal-Sprayed Nanostructured Coating Obtained from Milled Powder

Synthesis and characterization of porous Fe–25 wt.% Al alloy with controllable pore structure

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