Cyclic stress–strain response and dislocation structures in polycrystalline aluminum

El-Madhoun, Y.; Mohamed, Aezeden; Bassim, M.N.

doi:10.1016/s0921-5093(03)00347-2

Cited by 60 publications

(20 citation statements)

References 10 publications

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“…[37][38][39] Sirnivasa et al 37) found that nitrogen promoted the planar slip and a tendency for cell formation at lower stain rates at 600 C in the LCF behavior of 316L(N) stainless steel. El-Madhoun et al 38) discovered that the dislocation cellular structure was the predominant dislocation structure at the strain range of 1:0 Â 10 À3 -1:1 Â 10 À2 due to high stacking energy of polycrystalline aluminum. Mutual trapping of mobile dislocations into bundles and subsequent development into dislocation networks were attributed to the operating hardening mechanism.…”

Section: Resultsmentioning

confidence: 99%

Effect of Temperature and Strain Amplitude on Dislocation Structure of M963 Superalloy during High-Temperature Low Cycle Fatigue

Zheng

Sun

et al. 2006

Mater. Trans.

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An investigation was made on the strain-controlled low cycle fatigue (LCF) of a cast Ni-base superalloy M963 over a wide total strain range of 0.15-0.6% at a temperature range from 700 to 950 C in air. Correlations between dislocation structure and the testing temperature and applied strain amplitude were enabled through transmission electron microscopy (TEM) observation. At a low temperature region (700 and 800 C), dislocation shearing 0 precipitates by dislocation pairs and stacking faults at medium and high strain amplitudes, and a well-defined dislocation network at low total strain amplitudes were evident. At a high temperature region (900 and 950 C), dislocations by-passing 0 precipitates was the main deformation mode.

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Section: Resultsmentioning

confidence: 99%

Effect of Temperature and Strain Amplitude on Dislocation Structure of M963 Superalloy during High-Temperature Low Cycle Fatigue

Zheng

Sun

et al. 2006

Mater. Trans.

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“…Thus the dislocation patterns are often chaotic structures rather than the regular configurations [25]. In fact, El-Madhoun et al [34] found that there were only cell structures in the fatigued polycrystalline Al in all the strain ranges of 1.0×10 −3 -1.1×10 −2 . As shown in Fig.…”

Section: Science China Materialsmentioning

confidence: 99%

Basic criterion for the formation of self-organized dislocation patterns in fatigued FCC pure metals

Zhongguang

Zhang

2015

Sci. China Mater.

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tively proposed based on stacking fault energy (SFE).As shown in Fig. 1, PSB ladders or walls are a three-dimensional structure. PSB ladders from t he (12 − 1) plane or PSB walls from the (111) plane occupy about 10% of the PSBs by volume. The walls are 0.03-0.25 μm in thickness with a spacing of about 1.3 μm (see Fig. 2) and they consist of numerous dipoles, especially faulted dipole. The socalled faulted dipole consists of four Shockley partial dislocations and three stacking faults. Th e stair-rods lie at the ends of the stacking fault in the secondary slip plane and their relative position are thus fixed. The dipole as a whole can assume an S-or Z-shaped configuration depending on the position of the Shockley partials. In 1976, Antonopoulos et al. [11,12] pointed out that the matrix vein contained both primary edge dipole and faulted dipole, however, the PSBs were almost full of faulted dipoles, which reflected the microstructure evolution of dislocation patterns. On Based on a large number of experimental results available, it is found that not all the fatigued face-centered-cubic (FCC) pure metals can form the classical persistent slip band (PSB)-ladder structure. The formation of the regular dislocation patterns, especially the PSB ladders, follows one unified principle on the dislocation aggregation and evolution. According to the principle, a simple criterion based on stacking fault energy is proposed to judge whether or not the regular PSB ladders in different FCC pure metals can form.

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“…After an intense hardening stage at the beginning, the stress amplitude saturates in strain-controlled experiments. It is commonly reported [34,36,37,38,39] that the saturation stress is a function of the plastic strain amplitude for symmetric tension-compression tests both for various single-and polycrystalline materials. The saturation stress increases with the plastic strain amplitude, in some cases a plateau region exists as can be seen in Fig.…”

Section: Severe Plastic Deformationmentioning

confidence: 99%

Cyclic high-pressure torsion of nickel and Armco iron

Wetscher

Pippan

2006

Philosophical Magazine

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Cyclic stress–strain response and dislocation structures in polycrystalline aluminum

Cited by 60 publications

References 10 publications

Effect of Temperature and Strain Amplitude on Dislocation Structure of M963 Superalloy during High-Temperature Low Cycle Fatigue

Effect of Temperature and Strain Amplitude on Dislocation Structure of M963 Superalloy during High-Temperature Low Cycle Fatigue

Basic criterion for the formation of self-organized dislocation patterns in fatigued FCC pure metals

Cyclic high-pressure torsion of nickel and Armco iron

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