Differential speed rolling of Ni3Al based intermetallic alloy—Analysis of the deformation process

Polkowski, Wojciech; Jóźwik, Paweł; Bojar, Z.

doi:10.1016/j.matlet.2014.09.129

Cited by 26 publications

(19 citation statements)

References 17 publications

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“…They also indicated that the grains with the orientation close to [113]-[111] recovered and formed a cellular structure much faster than the grains with the orientation [001]. Similar results were also obtained for the alloy based on the Ni 3 Al intermetallic phase [38][39][40].…”

Section: Discussionsupporting

confidence: 65%

“…Based on the above observations and the results of other research [22,39,[41][42][43], we can try to generalize the phenomena of plastic deformation occurring during forging of an Fe 3 Al-based intermetallic alloy investigated in this work. In the initial stage of deformation, the enormous rise of the dislocation density occurs in the material.…”

Section: Discussionmentioning

confidence: 83%

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Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

2016

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Tri-axial plane-strain forging was applied to the Fe-28Al-5Cr-0.8Zr-0.04B intermetallic alloy, in order to study its grain refinement and possible improvement in mechanical properties. The forging temperature range was from 20 to 600°C. The maximum number of forging passes was 67. The deformed microstructure was investigated using electron backscatter diffraction in a scanning electron microscope. At forging temperatures \500°C, the alloy was very prone to brittle cracking. At the temperature range of 500-600°C, the overall plasticity of material increased and the cracking tendency was reduced but not completely eliminated. Extensive processes of dynamic recovery/recrystallization were observed during forging at 600°C after 10-40 passes. Recrystallized areas with an average grain size of a few micrometers were observed. However, even after severe deformation at 600°C, resulting from 40 forging passes (e * 11.3), dynamic recrystallization was incomplete and the fraction of low-angle boundaries was still high. The Vickers microhardness substantially increased from 280 HV0.1 to 450 HV0.1 at the center of the sample after both deformations at room temperature as well as after 20-40 cycles at 500-600°C. However, a further increase of strain for a sample deformed at 600°C after 67 passes (e * 28) led to quite a significant hardness decrease at the center of the sample. This phenomenon could be associated with the initiation of dynamic recrystallization. None of the samples forged at the 500-600°C range exhibited any ductility improvement during subsequent tensile testing at room temperature, most likely, owing to the absence of a uniform ultrafine-grained structure developed during forging.

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Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 83%

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

2016

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“…Moreover, we recently showed that the DSR method also may be successfully applied to improvement of mechanical properties of hardly deformable materials such as intermetallic-based alloys. [12] Despite the limited reported data, similar results were also presented in a few articles on the DSR-processed low carbon steel. Suharto and Ko [13] reported that the initial ferrite grain size of 35 lm was significantly refined to 700 nm after DSR processing under the roll speed ratio of 1:4 for lower and upper rolls.…”

Section: Introductionsupporting

confidence: 64%

Electron Backscatter Diffraction Study on Microstructure, Texture, and Strain Evolution in Armco Iron Severely Deformed by the Differential Speed Rolling Method

Polkowski

Jóźwik

Bojar

2015

Metall Mater Trans A

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Results of the electron backscatter diffraction (EBSD) study on structural changes in Armco iron subjected to severe plastic deformation by differential speed rolling (DSR) with different values of roll speed mismatch (R = 1, 2, 3, and 4) are shown in the present article. Results of the EBSD microstructure evaluation reveal that a differentiation of roll speeds results in an effect of structure refinement-iron samples processed with high roll speed mismatch are characterized by a high fraction of grains with submicron size. A microtexture examination shows that the DSR process leads to an overall texture weakening effect and a displacement (a shifting to different ''stable'' positions) of the basic rolling texture components, due to an additional presence of a simple shear component in the deformation gradient imposed to the material. Despite the higher hardness of the DSR-processed samples, results of the EBSD strain analysis indicate that some part of the stored deformation energy is released during rolling with an additional presence of shear strain. This finding points toward the possibility of activating a dynamic transformation of the material structure into some more stable state. However, since the observed structural changes take place inside deformation bands and do not lead directly to the formation of a fully equiaxed grain structure, it seems to be more reasonable to call the observed structure transformation a subgrain structure evolution through accumulated shear deformation, which may be related to the dynamic recovery process.

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“…In recent years intermetallic based alloys from transition metals -aluminum binary systems (e.g. Ni-Al [12][13][14][15][16][17][18] or Fe-Al [19][20][21][22][23][24][25]), so called aluminides, have gathered a lot of attention from both scientific and industrial environments in terms of their high temperature applications. Fe-Al intermetallic alloys exhibit a high resistance towards oxidation, carbonization and corrosion at elevated temperature, that make them competitive to conventional high temperature materials.…”

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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Differential speed rolling of Ni3Al based intermetallic alloy—Analysis of the deformation process

Cited by 26 publications

References 17 publications

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

Electron Backscatter Diffraction Study on Microstructure, Texture, and Strain Evolution in Armco Iron Severely Deformed by the Differential Speed Rolling Method

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

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