Microstructure evolution and strengthening mechanisms of cold-drawn commercially pure aluminum wire

Hou, J.P.; Wang, Q.; Yang, H.J.; Wu, Xiaoqing; Li, C.H.; Li, X.W.; Zhang, Z.F.

doi:10.1016/j.msea.2015.04.102

Cited by 72 publications

(24 citation statements)

References 26 publications

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“…Moreover, a further enhancement of 30MPa in material strength was observed after ECAD process on drawn wires with a reduction of the true strain of 0.04. The plastic deformation of each drawing pass and the SPD imposed by ECAD die led to an increase of the material strength due to the hardening effect produced by the accumulation of the dislocations [13,18] and the Hall-Petch (H-P) effect induced by the microstructural phenomena (i.e. grain refinement).…”

Section: Methodsmentioning

confidence: 99%

“…Hou et al [13] analysed the commercially pure aluminium wires (CPAWs) by tensile tests, electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) observations to establish the relation between the mechanical properties and the microstructural evolution. The outcomes showed as the texture, grain size and dislocation density mainly influence the performance of the material after the drawing process.…”

Section: Introductionmentioning

confidence: 99%

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Finite element modelling of microstructural changes during equal channel angular drawing of pure aluminium

Caruso

Imbrogno

2021

Int J Adv Manuf Technol

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Grain refinement by severe plastic deformation (SPD) techniques, as a mechanism to control microstructure (recrystallization, grain size changes,…) and mechanical properties (yield strength, ultimate tensile strength, strain, hardness variation…) of pure aluminium conductor wires, is a topic of great interest for both academic and industrial research activities. This paper presents an innovative finite element (FE) model able to describe the microstructural evolution and the continuous dynamic recrystallization (CDRX) that occur during equal channel angular drawing (ECAD) of commercial 1370 pure aluminium (99.7% Al). A user subroutine has been developed based on the continuum mechanical model and the Hall-Petch (H-P) equations to predict grain size variation and hardness change. The model is validated by comparison with the experimental results and a predictive analysis is conducted varying the channel die angles. The study provides an accurate prediction of both the thermo-mechanical and the microstructural phenomena that occur during the process characterized by large plastic deformation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finite element modelling of microstructural changes during equal channel angular drawing of pure aluminium

Caruso

Imbrogno

2021

Int J Adv Manuf Technol

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“…The yield strength and the ultimate tensile strength of the CPAWs are ~203.5 MPa and ~212.5 MPa, respectively. The strengthening mechanisms of the CPAWs have been explained by the formation of high-density dislocations, <111> textures and high-angle grain boundaries in our previous study [ 6 ]. The fracture elongation of the CPAWs is only about 2.8%.…”

Section: Methodsmentioning

confidence: 99%

“…For instance, the external-layers of the aluminum conductor steel reinforced (ACSR) and the aluminum conductor alloy reinforced (ACAR) widely applied to overhead power lines are commonly made of CP aluminum. A number of investigations have been mainly focused on the strength, electrical conductivity and deformation behavior of the CP aluminum and aluminum alloys [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. However, the fatigue performance of these materials is also a critical problem, which should be further studied.…”

Section: Introductionmentioning

confidence: 99%

Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire

et al. 2016

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Fatigue properties and cracking behavior of cold-drawn commercially pure aluminum wires (CPAWs) widely used as the overhead transmission conductors were investigated. It was found that the fracture surface of the CPAWs shows an obvious four-stage fracture characteristic, i.e., crack initiation, planar crack propagation, 45 • -inclined crack propagation and final rapid fracture. The crack growth mechanisms for the CPAWs were found quite different from those for the conventional coarse-grained materials. The cracks in the CPAWs firstly grow along the grain boundaries (Stage I crack growth), and then grow along the plane of maximum shear stress during the last stage of cycling (Stage II crack growth), leading to the distinctive fracture surfaces, i.e., the granular surface in the planar crack propagation region and the coarse fatigue striations in the 45 • -inclined crack propagation region. The grain boundary migration was observed in the fatigued CPAWs. The increase in fatigue load enhances the dislocation recovery, increases the grain boundary migration rate, and thus promotes the occurrence of softening and damage localization up to the final failure.

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“…Previous studies have shown that texture is a common microstructure of clod-drawn face-centered cubic metals, which could influence the mechanical properties [21][22][23]. Figure 5 gives the radial orientation distribution maps of the CPAWs and the AFWs.…”

Section: Electron Backscatter Diffraction (Ebsd) Observationsmentioning

confidence: 99%

Role of Multi-Scale Microstructure in the Degradation of Al Wire for Power Transmission

Liu

et al. 2020

Applied Sciences

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As common conductive materials, Al wires are used on overhead transmission lines under long-term heating conditions. In this study, the strength degradation behavior and the strength-electrical conductivity relation of the commercially pure Al wires (CPAWs) and the Al-Fe wires (AFWs) annealed at various temperatures were investigated based on the microstructure evolution. The strength degradation rate of the AFW is always higher than that of the CPAW. A linear trade-off relation between strength and electrical conductivity for the annealed Al wires are clarified. The results reveal that the mechanisms behind the trade-off relation between the strength and the electrical conductivity for the annealed CPAWs and the annealed AFWs are the recovery of dislocations and the obvious increase of grain width, which leads to the decrease of strength and the increase of electrical conductivity. The coalescence of precipitate in the AFW leads to the obvious decrease of strength, which results in the higher strength degradation rate for the AFW as compared with that for the CPAW. Consequently, the principle of microstructure design for anti-degradation of Al wire is presented.

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Microstructure evolution and strengthening mechanisms of cold-drawn commercially pure aluminum wire

Cited by 72 publications

References 26 publications

Finite element modelling of microstructural changes during equal channel angular drawing of pure aluminium

Finite element modelling of microstructural changes during equal channel angular drawing of pure aluminium

Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire

Role of Multi-Scale Microstructure in the Degradation of Al Wire for Power Transmission

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