Micrbband Formation in Cyclic Extrusion Compression of Aluminum

Richert, M.; McQueen, H.J.; Richert, J.

doi:10.1179/cmq.1998.37.5.449

Cited by 16 publications

(17 citation statements)

References 16 publications

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“…금속재료의 결정립을 서브마이크론 또는 나노레벨까지 미세화하면 Hall-Petch관계 , HPT (High Pressure Torsion)법 6) , CEC (Cyclic Extrusion Compression)법 7) , ARB (Accumulative Roll Bonding)법 …”

Section: 서 론unclassified

Effect of Equal Channel Angular Pressing on the Pitting Corrosion Resistance of Hard Anodized Al5052 Alloy

Son¹

2015

Journal of the Korean institute of surface engineering

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AbstractsThe effect of equal channel angular pressing (ECAP) on the pitting corrosion resistance of hard anodized Al5052 alloy was investigated. The degree of internal stress generated in anodic oxide films during hard anodization was also evaluated with a strain gauge method. The pitting corrosion resistance of hard anodized Al5052 alloy was greatly decreased by ECAP. Cracks occurred in the anodic oxide film during hard anodization and these cracks were larger and deeper in the alloy with ECAP than without. The pitting corrosion was accelerated by cracks. The internal stress present in the anodic oxide films was compressive and the stress was higher in the alloys with ECAP than without, resulting in an increased likelihood of cracks. The pitting corrosion resistance of hard anodized Al5052 alloy was improved by annealing at the range of 473-573K after ECAP processed at room temperature for four passes. The compressive internal stress gradually decreased with increasing annealing temperature. It is assumed that the improvement in the pitting corrosion resistance of hard anodized Al5052 alloy by annealing may be attributed to a decrease in the likelihood of cracks due to the decreased internal stresses in anodic oxide films.

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Section: 서 론unclassified

Effect of Equal Channel Angular Pressing on the Pitting Corrosion Resistance of Hard Anodized Al5052 Alloy

Son¹

2015

Journal of the Korean institute of surface engineering

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“…[4] Severe plastic deformation (SPD) methods are one of the most efficient ways to produce bulk UFG metals. In these techniques, an extremely high strain is imposed on a material in order to obtain the structure refinement effect through formation of intersected shear bands [5] or a dynamically activated recovery or recrystallization process. [6] So far, there are a few hydrostatic SPD methods that have been successfully used to fabricate UFG metals and alloys (e.g., equal channel angular pressing, cyclic extrusion compression, or high pressure torsion).…”

Section: Introductionmentioning

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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“…Accumulative roll-bonding (ARB) process [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], a severe plastic deformation technique, has a great advantage that both grain refinement and high strengthening can be attained without any additions of alloying elements or ceramic particles and a change in dimension of the materials. In addition, the ARB process is mostly appropriate for practical applications because it can be performed readily by the conventional rolling process.…”

Section: Introductionmentioning

confidence: 99%

Fabrication And Mechanical Properties Of A Nanostructured Complex Aluminum Alloy By Three-Layer Stack Accumulative Roll-Bonding

Lee¹,

Lee²

2015

Archives of Metallurgy and Materials

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A multi-layered complex aluminum alloy was successfully fabricated by three-layer stack accumulative roll bonding(ARB) process. The ARB using AA1050 and AA5052 alloy sheets was performed up to 7 cycles at ambient temperature without lubrication. The specimen processed by the ARB showed a multi-layer aluminum alloy sheet in which two aluminum alloys are alternately stacked. The grain size of the specimen decreased with the number of ARB cycles, became about 350nm in diameter after 7cycles. The tensile strength increased with the number of ARB cycles, after 6c it reached 281MPa which is about twice higher than that of the starting material. The microstructures and mechanical properties of a three-layer AA1050/AA5052 alloy fabricated by the ARB were compared to those of the conventional ARB-processed material.

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Micrbband Formation in Cyclic Extrusion Compression of Aluminum

Cited by 16 publications

References 16 publications

Effect of Equal Channel Angular Pressing on the Pitting Corrosion Resistance of Hard Anodized Al5052 Alloy

Effect of Equal Channel Angular Pressing on the Pitting Corrosion Resistance of Hard Anodized Al5052 Alloy

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

Fabrication And Mechanical Properties Of A Nanostructured Complex Aluminum Alloy By Three-Layer Stack Accumulative Roll-Bonding

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