On the effect of plastic anisotropy, strength and work hardening on the tensile ductility of aluminium alloys

Frodal, Bjørn Håkon; Morin, David; Hopperstad, Odd Sture

doi:10.1016/j.ijsolstr.2019.10.003

Cited by 28 publications

(9 citation statements)

References 45 publications

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“…When the amount of cold rolling is further increased to 90%, as shown in Figure 7D,E, the dislocation density further increases, the dislocation tangles, and a dislocation wall forms. This indicates that during the cold rolling process of the as‐sintered 2024 aluminium alloy, a large number of dislocations are formed around the second phase particles and at the grain boundaries, which hinders the grain slippage and leads to the work hardening effect of the alloy 31,32 . During the continuous cold rolling process, dislocations are further accumulated around the second‐phase particles and at the grain boundaries, resulting in cracking at these places due to stress concentration.…”

Section: Resultsmentioning

confidence: 99%

Edge crack forming mechanism and the countermeasures in as‐sintered 2024 aluminium alloy during cold rolling

Wang

Yang

Huang

et al. 2020

Fatigue Fract Eng Mat Struct

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In order to solve the problem of edge cracking of the as-sintered 2024 aluminium alloy during cold rolling, the initiation mechanisms of edge cracking were studied. The results indicate that the "herringbone" crack parallel to the rolling direction and the "zigzag" crack perpendicular to the rolling direction easily formed during cold rolling. The former mainly occurred during the early stage of cold rolling and was related to the poor plasticity of the as-sintered alloy and the stress state at the end of the rolled plate, whereas the latter appeared in a sample with a rolling reduction of more than 60%, mainly because the grains at the edge of the sample were subjected to threedirection shear stress, which results in cracking along the grain boundaries. However, both herringbone and zigzag cracks propagated along the grain boundary. Finally, the crack-free products were obtained by optimizing the cold rolling process.

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Section: Resultsmentioning

confidence: 99%

Edge crack forming mechanism and the countermeasures in as‐sintered 2024 aluminium alloy during cold rolling

Wang

Yang

Huang

et al. 2020

Fatigue Fract Eng Mat Struct

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“…Although the variation in yield stress, work hardening and plastic flow with orientation, also referred to as plastic anisotropy, is mainly caused by the crystallographic texture of the alloy [1,4], studies have found that the precipitate structure [5] and the grain morphology [6] may also influence the plastic anisotropy. When discussing the anisotropy in ductile fracture, there are three main sources of anisotropy that are important [7].…”

Section: Introductionmentioning

confidence: 99%

“…The first is plastic anisotropy, which is mainly related to the texture as addressed above. The influence of plastic anisotropy on ductile fracture is significant as the plastic deformation of the surrounding material influences the void growth [4]. The second is the morphological anisotropy, which is related to the shape of the voids and the particles from which the voids nucleate.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Plasticity and Fracture of Three 6000-Series Aluminum Alloys

Thomesen

Hopperstad

2021

Metals

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The influence of microstructure on plasticity and fracture of three 6000-series aluminum alloys is studied with emphasis on the anisotropy caused by the extrusion process. Tension tests on smooth and notched specimens are performed in different directions with respect to the extrusion direction, where the stress and strain to fracture are based on local measurements inside the neck or notch. The microstructure of the alloys, i.e., grain structure, crystallographic texture and size distribution of constituent particles, is characterized and used to explain the experimental findings. The experiments show considerable differences in the directional variation of the yield stress, the plastic flow, the work hardening, and the failure strain between alloys exhibiting recrystallization texture and deformation texture. The alloys with recrystallized microstructure exhibited substantial anisotropic work hardening caused by texture evolution and a stronger notch sensitivity of the failure strain than the alloy with deformed, non-recrystallized microstructure. Comparisons are made with previous experiments on the same alloys in the cast and homogenized condition, and the effects of the microstructural changes caused by the extrusion process on the macroscopic response are discussed.

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“…It was found that the minimum chip thickness can be reduced to a single atomic layer in an atomic scale using rounding tools for mechanical cutting. Frodal et al [18] studied three aluminum alloys with different grain structures and crystal textures, and found that effects of yield strength and work hardening depend on plastic anisotropy. Pogrebnjak et al [19,20] studied two kinds of nano-multilayer films CrN/MoN and TiN/SiC through experiments, and found that the preferred crystallographic orientation will change under different voltages.…”

Section: Introductionmentioning

confidence: 99%

Effects of Anisotropy on Single Crystal Silicon in Polishing Non-Continuous Surface

Wang

Feng

et al. 2020

Micromachines

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A molecular dynamics model of the diamond abrasive polishing the single crystal silicon is established. Crystal surfaces of the single crystal silicon in the Y-direction are (010), (011), and (111) surfaces, respectively. The effects of crystallographic orientations on polishing the non-continuous single crystal silicon surfaces are discussed from the aspects of surface morphology, displacement, polishing force, and phase transformation. The simulation results show that the Si(010) surface accumulates chips more easily than Si(011) and Si(111) surfaces. Si(010) and Si(011) workpieces are deformed in the entire pore walls on the entry areas of pores, while the Si(111) workpiece is a local large deformation on entry areas of the pores. Comparing the recovery value of the displacement in different workpieces, it can be seen that the elastic deformation of the A side in the Si(011) workpiece is larger than that of the A side in other workpieces. Pores cause the tangential force and normal force to fluctuate. The fluctuation range of the tangential force is small, and the fluctuation range of the normal force is large. Crystallographic orientations mainly affect the position where the tangential force reaches the maximum and minimum values and the magnitude of the decrease in the tangential force near the pores. The position of the normal force reaching the maximum and minimum values near the pores is basically the same, and different crystallographic orientations have no obvious effect on the drop of the normal force, except for a slight fluctuation in the value. The high-pressure phase transformation is the main way to change the crystal structure. The Si(111) surface is the cleavage surface of single crystal silicon, and the total number of main phase transformation atoms on the Si(111) surface is the largest among the three types of workpieces. In addition, the phase transformation in Si(010) and Si(011) workpieces extends to the bottom of pores, and the Si(111) workpiece does not extend to the bottom of pores.

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On the effect of plastic anisotropy, strength and work hardening on the tensile ductility of aluminium alloys

Cited by 28 publications

References 45 publications

Edge crack forming mechanism and the countermeasures in as‐sintered 2024 aluminium alloy during cold rolling

Edge crack forming mechanism and the countermeasures in as‐sintered 2024 aluminium alloy during cold rolling

Anisotropic Plasticity and Fracture of Three 6000-Series Aluminum Alloys

Effects of Anisotropy on Single Crystal Silicon in Polishing Non-Continuous Surface

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