The effect of temperature and amplitude on dislocation structures in cyclically deformed pure aluminium

Charsley, P.; Bangert, U.; Appleby, Linda Joy Harris

doi:10.1016/0921-5093(89)90311-0

Cited by 15 publications

(6 citation statements)

References 6 publications

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“…But at both room temperature and 77 K (-196°C), the ladder structure was not observed. However, at 77 K (-196°C), Charsley and Harris [13] and Charsley et al [14] found that wall structures including PSB-ladder structures appeared in pure polycrystalline Al. Thereafter, Videm and Ryum [15,16] systematically summarized the cyclic deformation behavior of ½001 Al single crystals and compared it with the results of polycrystalline Al.…”

Section: Introductionmentioning

confidence: 97%

Cyclic Deformation Behaviors of $$ [\bar{5}79] $$-Oriented Al Single Crystals

Zhongguang

Zhang

2010

Metall Mater Trans A

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During the cyclic deformation of ½ " 579, Al single crystals with a high stacking fault energy produced slip bands that were characterized by wavy slip. Its cyclic stress response curve demonstrated that the specimen experienced hardening-softening-secondary hardening in sequence with repeated fluctuation stresses usually less than 10 MPa, which is far lower than those of Cu, Ni, and Ag single crystals. Finally, the whole surface of the Al single crystals was covered with intense intrusion and extrusion, and the cell structure is the most typical dislocation arrangement. These cells mainly comprise loose clusters of dislocations, which move more freely. In the center of the cell, the dislocation density is relatively low, and most dislocations concentrate in the cell wall. At room temperature, compared with cyclically deformed Cu, Ni, and Ag single crystals, the cyclic deformation behaviors of Al single crystals show significant differences, which are highlighted in this study.

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Section: Introductionmentioning

confidence: 97%

Cyclic Deformation Behaviors of $$ [\bar{5}79] $$-Oriented Al Single Crystals

Zhongguang

Zhang

2010

Metall Mater Trans A

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“…7 shows that the fraction is nearly 60% when fatigued at 83 K. Average wall-to-wall spacing is about 300 nm and this value is much less than the frequently observed values between 1 to 4 mm in single-crystalline and coarse-grained Al. [13][14][15][16] As shown in Figs. 6(b) and (c), the dislocation walls appear to align parallel to the {1 0 0} plane just like those formed in single-crystalline and coarse-grained Al.…”

Section: Microstructural Observationmentioning

confidence: 99%

“…6(b) and (c), the dislocation walls appear to align parallel to the {1 0 0} plane just like those formed in single-crystalline and coarse-grained Al. [13][14][15][16][17] It is known that the multiple slip is responsible for the formation of the {100} walls and labyrinth structure in fcc metals. 15,18) It is very probable that such multiple slip (or the interaction between different slip systems) occurs very frequently in highly constrained grains of UFG materials.…”

Section: Microstructural Observationmentioning

confidence: 99%

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Low-Cycle Fatigue of Ultrafine-Grained Aluminum at Low Temperatures

et al. 2011

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Ultrafine-grained (UFG) Al of 99:98$99:99% purity was fabricated by equal channel angular pressing. Fully reversed tensioncompression low-cycle fatigue tests were carried out under plastic strain control at various temperatures between 83 K and 300 K. At 300 K, UFG Al showed rapid cyclic softening. As test temperature decreased, cyclic softening became less significant and at 83 K, UFG Al showed cyclic hardening till saturation. Formation of shear bands and development of dislocation structure were the characteristic features of fatigued specimens. As test temperature decreased, the area fraction of shear bands on specimen surface decreased and at 83 K, shear bands could not be observed. In addition, local grain coarsening occurred except at 83 K. Formation of dislocation cell and wall structures became more frequent at lower temperatures and well-developed dislocation walls were formed in grains as small as 1.5 mm in size at 83 K.

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“…28) In contrast, single-crystalline and CG Al show initial hardening, softening and secondary hardening 3234) with the formation of characteristic dislocation structure such as vein, 35,36) wall, 35,36) labyrinth 32,35,37) and cell 28,34) structures. Although the cyclic deformation behavior of UFG Al is worth investigating more in detail, most reports were on commercially pure Al or on Al alloys.…”

Section: )mentioning

confidence: 99%

Stability of Fatigued Dislocation Wall Structure in Coarse-Grained and Ultrafine-Grained Aluminum against Monotonic Tensile Deformation

et al. 2013

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Coarse-grained (CG) and ultrafine-grained (UFG) pure aluminum samples fabricated by equal channel angular pressing (ECAP) were cyclically deformed at 77 K under constant plastic strain amplitude. Monotonic tensile tests were performed at 300 and 77 K soon after the fatigue tests. In spite of the increase in the tensile strength of fatigued CG Al, tensile ductility decreased remarkably in comparison to that of as-annealed CG Al. On the other hand, the ultimate tensile strength (UTS) and tensile ductility of UFG Al were much higher at 77 K than those at 300 K. Furthermore, UFG Al at 77 K maintained high UTS and high tensile ductility even after fatigue tests. Microstructural observation has revealed that dislocation wall structure formed in fatigued CG Al persists after the monotonic tensile tests. However, dislocation wall structure formed in fatigued UFG Al disappeared during early stages of monotonic tensile tests at both 300 and 77 K. These results indicate that the dislocation wall structure in UFG Al is unstable against succeeding monotonic tensile deformation.

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The effect of temperature and amplitude on dislocation structures in cyclically deformed pure aluminium

Cited by 15 publications

References 6 publications

Cyclic Deformation Behaviors of $$ [\bar{5}79] $$-Oriented Al Single Crystals

Cyclic Deformation Behaviors of $$ [\bar{5}79] $$-Oriented Al Single Crystals

Low-Cycle Fatigue of Ultrafine-Grained Aluminum at Low Temperatures

Stability of Fatigued Dislocation Wall Structure in Coarse-Grained and Ultrafine-Grained Aluminum against Monotonic Tensile Deformation

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