Finite element modelling of equal channel angular extrusion

Prangnell, P.B.; Harris, Christina R.; Roberts, S.M.

doi:10.1016/s1359-6462(97)00192-9

Cited by 184 publications

(82 citation statements)

References 4 publications

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“…During ECAP the strain experienced by billet is homogeneous throughout most of the billet, but the billet experiences an inhomogeneous strain at the corner of the die, which has been revealed by experiment [7,8] and modeling [9]. The deformation in the middle of the billet is generally thought to follow the single shear model while the deformation in both the top edge and the bottom edge are more complex, being influenced by friction, back pressure and channel intersection angle [1,3].…”

Section: Strengthening Mechanism Of the Ecap-processed Aluminummentioning

confidence: 99%

Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after one pass of equal channel angular pressing

Qiao

Starink

Gao

2009

Materials Science and Engineering: A

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Samples of an Al1050 aluminum alloy (99.5% Al) were subjected to equal channel angular pressing (ECAP) at room temperature for 1 pass. The microhardness is highest at the centre of the cross section of the billet, and the grain size is smallest at the edges, which rules out grain size strengthening as the dominant hardening mechanism. On isochronal ageing at temperatures between 200 and 375 ºC, low angle grain boundaries disappear, the hardness gradually decreases, and hardness differences gradually disappear. A model is described that captures the strengthening mechanisms and model results fit the experimental results well. Analysis of recovery behaviour and strength modelling indicates that the contribution of the dislocations to the strength is higher than that of grain size.

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Section: Strengthening Mechanism Of the Ecap-processed Aluminummentioning

confidence: 99%

Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after one pass of equal channel angular pressing

Qiao

Starink

Gao

2009

Materials Science and Engineering: A

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“…Eq. (1) has been verified to be accurate by finite element modelling [22] and experiments [23] when frictional effects were ignored.…”

Section: Theorymentioning

confidence: 86%

Fabrication of MEMS components using ultrafine-grained aluminium alloys

Qiao

Gao

Moktadir

et al. 2010

J. Micromech. Microeng.

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Abstract.A novel process for the fabrication of a microelectromechanical systems (MEMS) metallic component with features smaller than 10 µm and high thermal conductivity was investigated. These may be applied in new or improved microscale components, such as (micro-) heat exchangers. In the first stage of processing, equal channel angular pressing (ECAP) was employed to refine the grain size of commercial purity aluminium (Al-1050) to the ultra fine grain (UFG) material. Embossing was conducted using a micro silicon mould fabricated by deep reactive ion etching (DRIE). Both cold embossing and hot embossing were performed on the coarse-grained and UFG Al-1050. Cold embossing on the UFG Al-1050 led to a partially transferred pattern from the micro silicon mould and high failure rate of the mould. Hot embossing on the UFG Al-1050 provided a smooth embossed surface with fully transferred pattern and low failure rate of the mould, while hot embossing on the coarse-grained Al-1050 resulted in a rougher surface with shear bands.

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“…The influence of the die channel angle has been investigated using pure aluminium and the results show that an angle of Φ close to 90º represents the optimum condition for achieving excellent grain refinement and a large fraction of boundaries having high angles of misorientation [5]. Finite element modelling of the ECAP configuration with ψ = 0° shows that, at angles close to Φ ≈ 90°, it is difficult to completely fill the die corner when pressing less ductile materials except under conditions where a back pressure is applied at the point of exit from the die [6]. These difficulties may be reduced in practice by increasing the channel angle and/or the strain rate sensitivity of the material [7].…”

Section: Introductionmentioning

confidence: 96%

Texture evolution by shear on two planes during ECAP of a high-strength aluminum alloy

et al. 2008

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The evolution of texture was examined during equal-channel angular pressing (ECAP) of an Al-Zn-Mg-Cu alloy having a strong initial texture. An analysis of the local texture using electron back-scatter diffraction demonstrates that shear occurs on two shear planes: the main shear plane (MSP) equivalent to the simple shear plane, and a secondary shear plane which is perpendicular to the MSP. Throughout most regions of the ECAP billet, the MSP is close to the intersection plane of the two channels but with a small (5˚) deviation. Only the {111}<110> and {001}<110> shear systems were activated and there was no experimental evidence for the existence of other shear systems. In a small region at the bottom edge of the billet that passed through the zone of intersection of the channels, the observed textures were fully consistent with the rolling textures of Copper and Goss.

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Finite element modelling of equal channel angular extrusion

Cited by 184 publications

References 4 publications

Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after one pass of equal channel angular pressing

Hardness inhomogeneity and local strengthening mechanisms of an Al1050 aluminium alloy after one pass of equal channel angular pressing

Fabrication of MEMS components using ultrafine-grained aluminium alloys

Texture evolution by shear on two planes during ECAP of a high-strength aluminum alloy

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