EBSD and X-ray diffraction study on the recrystallization of cold rolled Ni3Al based intermetallic alloy

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

doi:10.1016/j.jallcom.2014.06.106

Cited by 46 publications

(27 citation statements)

References 24 publications

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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%

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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%

“…[5,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]37]. However, these methods are complex, inefficient, energy-consuming and generates high production costs.…”

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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“…In our previous research, devoted to the EBSD study on recrystallization of cold-rolled Ni 3 Al-based alloy, [22] we showed that the GOS-based analysis allows distinguishing grains that belong to the deformed matrix and those that undergo static recovery or recrystallization. GOS values below 1 deg and in the range of 1 to 3 deg were designated as newly formed (recrystallized) and recovered grains, respectively.…”

Section: Strain Changes During Rollingmentioning

confidence: 99%

“…Principles of the EBSD lattice strain assessment have been described elsewhere (e.g., in our previous works [21] , [22] ). In the present work, diffraction pattern quality deterioration and local misorientation analysis approaches [23] , [24] were chosen.…”

Section: B Materials Characterizationmentioning

confidence: 99%

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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“…The process of dDRX is accomplished through nucleation and growth of the recrystallized grain to eliminate the defects caused by deformation, such as dislocation and sub-grain boundary, which is characterized by the migration of large-angle grain boundary [29]. The severe plastic deformation and higher temperature are necessary to the appearance of dDRX [30,31]. Therefore, we now discuss the temperature of the surface of NMCs caused by the accumulation of friction heat.…”

Section: Subsurface Morphology Of Nmcsmentioning

confidence: 99%

Influence of Subsurface Micro/Nano-Structural Evolution on Macroscopic Tribological Behavior of Ni3Al Matrix Composites

et al. 2015

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The relationship between macroscopic tribological behavior and subsurface micro/nano-structural evolution needs to be studied in detail. We report here the results of dry sliding tribological tests of Ni 3 Al matrix composites with 1.5 wt% graphene nanoplatelets (GNPs) under different loads. We found that the friction coefficient decreased with increasing load, while the wear rate showed a downward trend after an initial increase. During the sliding wear process, severe plastic deformation and an accumulation of friction heat caused the formation of an ultrafine layer (UL) and a matrix refinement layer (MRL). The UL contributes to the reduction of friction coefficient and wear rate, and the MRL contributes to the improvement of wear resistance. In addition, GNPs accumulating in the UL tend to be parallel to the worn surface, causing a reduction in friction and an increase in wear resistance for the properties of easily shearing off and high tensile strength. The hardness and elastic modulus of the UL and MRL increased due to grain refinement and the accumulation of GNPs in these layers. The effective hardness of the multilayer was approximately 7.2 GPa.

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EBSD and X-ray diffraction study on the recrystallization of cold rolled Ni3Al based intermetallic alloy

Cited by 46 publications

References 24 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

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

Influence of Subsurface Micro/Nano-Structural Evolution on Macroscopic Tribological Behavior of Ni3Al Matrix Composites

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