Comparison of dislocation density based approaches for prediction of defect structure evolution in aluminium and copper processed by ECAP

Bratov, Vladimir; Borodin, Elijah

doi:10.1016/j.msea.2015.02.019

Cited by 50 publications

(22 citation statements)

References 20 publications

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“…The significant difference between the dislocation density due to the size effect (2.36 × 10 15 m −2 ) and the dislocation density due to lattice microstrain (1.19 × 10 13 m −2 ) is connected with the energy balance. As it was demonstrated in the works [28,31], a comparison of the energy of the dislocation groups uniformly distributed with respect to the volume with the energy of the dislocation in the walls of the dislocation cells clearly shows that with a specific dislocation energy, it is more advantageous energy-wise to create cells instead of maintaining a uniform distribution. This relation, regardless of the applied treatment temperature, is proven for each of the analyzed samples.…”

Section: High Temperature X-ray Diffraction Studiesmentioning

confidence: 69%

“…The sample after plastic treatment in state T3 characterizes in the average crystallite size (35 nm) and the average dislocation density 5.30 × 10 14 m -2 . The development of the substructure and the increase of the dislocation density in aluminum processed with the use of severe plastic deformation depends on the stress, which has been discussed in the study [28]. In addition, the agglomeration of point defects in the supersaturated solution intensifies the process of subgrain formation during the plastic treatment [29,30].…”

Section: High Temperature X-ray Diffraction Studiesmentioning

confidence: 99%

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Influence of Plastic Strain Accumulation in Continuous Ingots during ECAP on Structure and Recrystallization Temperature of AlCu4MgSi Alloy

2020

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This work attempts to process AlCu4MgSi (AW 2017A) alloy continuous ingots by means of the equal channel angular pressing (ECAP) method. The equal channel angular pressing (ECAP) technique has been widely investigated in recent years as the most promising severe plastic deformation (SPD) method. The presented research was focused on the precise determination of the phase composition of the precipitates formed in the AlCu4MgSi alloy and its influence on intensive plastic deformation. In the second stage, the research was focused on explaining the recrystallization process. With the use of the high-temperature X-ray diffraction (HT-XRD) technique, the changes in the dislocation substructure at various recrystallization annealing temperatures were analyzed.

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Section: High Temperature X-ray Diffraction Studiesmentioning

confidence: 69%

Section: High Temperature X-ray Diffraction Studiesmentioning

confidence: 99%

Influence of Plastic Strain Accumulation in Continuous Ingots during ECAP on Structure and Recrystallization Temperature of AlCu4MgSi Alloy

2020

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“…In the geomagnetic environment, the magnetic field H σ generated by the stress can be equal to the applied external magnetic field when the material is subjected to external stress, which can be expressed as [22]:…”

Section: Numerical Model Of Non-uniform Crack Magnetic Chargementioning

confidence: 99%

Research on Features of Pipeline Crack Signal Based on Weak Magnetic Method

Liu

Luo

et al. 2020

Sensors

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Quantitative online detection of microcracks in long-distance oil and gas pipelines is an international problem, and the effective detection method is still lacking. In this paper, a mathematical model of non-uniform distribution of crack magnetic charges is established based on the stress distribution laws of pipeline cracks under internal pressure. The weak magnetic signal characteristics of pipeline cracks with different sizes are analyzed. The internal pressure increasing factor of weak magnetic signals are extracted to analyze the corresponding relationship between crack size and weak magnetic signals. The experimental study of the X70 pipeline is carried out. The results show that the axial component of the weak magnetic signal at the crack has a maximum value near the tip, and a minimum value appears in the middle of the crack. The internal pressure increasing factor is introduced to quantify the weak magnetic signal, the crack is in a safe state (not expanding) when the internal pressure increasing factor is positive, the weak magnetic signal has a linear relationship with the crack size. However, the crack is in a dangerous state when the internal pressure increasing factor is negative, and the pipeline crack will expand as the internal pressure increases.

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“…During continuous dynamic recrystallization, the strain-induced low-angle boundaries gradually transform into high-angle boundaries with an increase in the total strain. As a result, the ultrafine-grained structure with high dislocation density evolves at large strain levels [ 19 , 20 , 21 , 37 , 38 , 39 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement Kinetics in a Low Alloyed Cu–Cr–Zr Alloy Subjected to Large Strain Deformation

et al. 2017

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This paper investigates the microstructural evolution and grain refinement kinetics of a solution-treated Cu–0.1Cr–0.06Zr alloy during equal channel angular pressing (ECAP) at a temperature of 673 K via route BC. The microstructural change during plastic deformation was accompanied by the formation of the microband and an increase in the misorientations of strain-induced subboundaries. We argue that continuous dynamic recrystallization refined the initially coarse grains, and discuss the dynamic recrystallization kinetics in terms of grain/subgrain boundary triple junction evolution. A modified Johnson–Mehl–Avrami–Kolmogorov relationship with a strain exponent of about 1.49 is used to express the strain dependence of the triple junctions of high-angle boundaries. Severe plastic deformation by ECAP led to substantial strengthening of the Cu–0.1Cr–0.06Zr alloy. The yield strength increased from 60 MPa in the initial state to 445 MPa after a total strain level of 12.

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Comparison of dislocation density based approaches for prediction of defect structure evolution in aluminium and copper processed by ECAP

Cited by 50 publications

References 20 publications

Influence of Plastic Strain Accumulation in Continuous Ingots during ECAP on Structure and Recrystallization Temperature of AlCu4MgSi Alloy

Influence of Plastic Strain Accumulation in Continuous Ingots during ECAP on Structure and Recrystallization Temperature of AlCu4MgSi Alloy

Research on Features of Pipeline Crack Signal Based on Weak Magnetic Method

Grain Refinement Kinetics in a Low Alloyed Cu–Cr–Zr Alloy Subjected to Large Strain Deformation

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