Structure of Cu deformed by high pressure torsion

Hebesberger, T.; Stüwe, H.P.; Vorhauer, A.; Wetscher, Florian; Pippan, Reinhard

doi:10.1016/j.actamat.2004.09.043

Cited by 317 publications

(191 citation statements)

References 14 publications

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“…7(a) to 7(d), some flash is formed in the die parting line, which increases as the process continues. According to the simulation results, and consistent with the existing experimental reports [3][4][5][6][7], as the process continues and the number of rotations increases, the plastic deformation at every point of the disc continuously increases. In Fig.…”

Section: The Hpt Process Simulationsupporting

confidence: 76%

“…In general, a fine-grained material structure has many advantages over a coarse-grained one, and besides improving the mechanical properties, it helps raise the possibility of applying superplastic deep drawing processes to that material [1][2][3][4][5][6]. Such structures in polycrystalline materials are known as Ultra Fine Grained (UFG) [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Comparing Plastic Deformations Produced by HPT and ECAP Processes Using the Finite Element Analysis Method

Zeynali¹,

Bisadi²

2012

MECHANICS

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Applying Sever Plastic Deformation (SPD) to metals in order to form a nanocrystalline structure in them has been the subject of many recent researches. Investigations show that the nanocrystalline structure improves mechanical properties such as the yield strength and wear resistance. Among the SPD methods, more attention has been paid to the High Pressure Torsion (HPT) and Equal Cannel Angular Pressing (ECAP) methods. Irrespective of different work-piece geometries produced through these methods, studying the amount of plastic deformation as well as the method of applying it could be useful in comparing these processes and choosing the more effective ones. In this article, the results of finite element analysis of the HPT and ECAP processes on pure commercial aluminum are provided and the rate of success of each process in applying the SPD to the part is studied. Plastic deformation is considered as a parameter for calculating the amount of grain refinement. The two methods are compared and their advantages and disadvantages are discussed in the end.

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Section: The Hpt Process Simulationsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Comparing Plastic Deformations Produced by HPT and ECAP Processes Using the Finite Element Analysis Method

Zeynali¹,

Bisadi²

2012

MECHANICS

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“…This trend is consistent with the idea that high pressures suppress atomic diffusion and dislocation recovery to increase dislocation density and facilitate the grain refinement. 3,6,17,23) However, as shown in Fig. 3, the saturation hardness is independent of the applied pressure provided that first, the pressure is higher than P C and second, no phase transformation occurs.…”

Section: Inspection Ofmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12] The HPT has been applied to a wide range of metallic materials including ductile metals such as Al, 2) Cu, 3) Ni 4,5) and Fe, 6,7) and relatively hard and low ductile metals such as Ti, 8) Zr, 12) Mg, 9) Mo 10) and W. 11) The HPT is generally used with thin disc 1,13) or ring samples. 14) Using discs and/or rings, earlier reports showed that the hardness variation is represented by a unique function of the equivalent strain in Al, 14) Cu, 15) Fe, 7) Ti 16) and Zr.…”

Section: Introductionmentioning

confidence: 99%

Universal Plot for Hardness Variation in Pure Metals Processed by High-Pressure Torsion

Edalati

Horita

2010

Mater. Trans.

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Various pure metals (Al, Au, Ag, Cu, V, Pt, Ni, Fe, Co, Ti, Zr, Hf, Mo) including Cu-30%Zn are processed by high-pressure torsion. Most of Vickers microhardness (HV) values are expressed by a universal plot when they are normalized as ðHV=GÞðT=T m Þ and plotted against "P=G, where G, T=T m , " and P are the shear modulus, homologous temperature, equivalent strain and pressure, respectively. Deviations to this plot are for Al (99.99%), Ti, Zr, Hf and Cu-30%Zn and for when P is below a critical pressure.

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“…[42,107,108]). In pure FCC metals the trend is different, and the grain refinement comes to a complete halt at strains of about 4 to 8 [109,110] and in some cases even an increase in grain size has been seen on increasing effective strain beyond 8 [110]. The drastic slowing down of grain size reduction with increasing strain is often attributed to a dynamic recovery processes (see e.g.…”

Section: Dynamic Recovery and The Maximum Grain Refinement Achievablementioning

confidence: 99%

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

et al. 2009

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The grain refinement during severe plastic deformation (SPD) is predicted using volume averaged amount of dislocations generated. The model incorporates a new expansion of a model for hardening in the parabolic hardening regime, in which the work hardening depends on the effective dislocation free path related to the presence of non shearable particles and solute-solute nearest neighbour interactions.These two mechanisms give rise to dislocation multiplication in the form of generation of geometrically necessary dislocations and dislocations induced by local bond energies. The model predicts the volume averaged amount of dislocations generated and considers that they distribute to create cell walls and move to existing cell walls/grain boundaries where they increase in the grain boundary misorientation. The model predicts grain sizes of Al alloys subjected to SPD over 2 orders of magnitude. The model correctly predicts the considerable influence of Mg content and content of nonshearable particles on the grain refinement during SPD.

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Structure of Cu deformed by high pressure torsion

Cited by 317 publications

References 14 publications

Comparing Plastic Deformations Produced by HPT and ECAP Processes Using the Finite Element Analysis Method

Comparing Plastic Deformations Produced by HPT and ECAP Processes Using the Finite Element Analysis Method

Universal Plot for Hardness Variation in Pure Metals Processed by High-Pressure Torsion

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

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