Flow stress anisotropy and Bauschinger effect in ultrafine grained copper

Haouaoui, M.; Караман, И.; Maier, Hans Jürgen

doi:10.1016/j.actamat.2006.07.022

Cited by 82 publications

(29 citation statements)

References 48 publications

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“…The substructural development may lead to the much smaller grain thickness and aspect ratio in actual. Haouaoui et al 9) also reported that route A produces the texture similar to a rolling texture and the grain thickness direction (i.e. normal to the Z plane) is preferably oriented along the [313] direction in the case of OFHC Cu.…”

Section: Dislocation Free Lengthmentioning

confidence: 99%

“…The larger L in the elongated grains is expected to result in extended ductility. Haouaoui et al 9) estimated L by considering the geometrical change of an initial cubic element and the corresponding texture development during ECAP of OFHC Cu. In the case of repetitive route A, the initial cubic element elongates with an inclined angle N with respect to the sample axis as shown in Fig.…”

Section: Dislocation Free Lengthmentioning

confidence: 99%

“…the penetrator) in military and/or petroleum industries. 8) Regarding the mechanical properties of nonequiaxed UFG materials, Haouaoui et al 9) reported that the grain morphology is the most influencing factor on the plastic flow anisotropy of UFG OFHC Cu under quasi-static loading condition. By contrast, Xu et al 10) demonstrated that plastic anisotropy of UFG Al alloys processed by repetitive equal channel angular pressing (ECAP) diminishes after 6 passes regardless of the strain path, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Factors Influencing Tensile Ductility of OFHC Cu Having Different Ultrafine Grained Structures

et al. 2010

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Tensile ductility of OFHC Cu with the different ultrafine grained (UFG) structures, which were fabricated by the different routes of equal channel angular pressing (ECAP), was associated in detail with the microstructural characteristics developed by ECAP. OFHC Cu having the lamellar and equiaxed UFG structures was prepared by ECAP of routes A and B c , respectively up to 8 and 16 passes. Their microstructures were closely examined by transmission electron microscopy and orientation image mapping. Tensile tests at room temperature were conducted on the ECAPed samples under the quasi-static condition of 10 À3 s À1 and 1 s À1 . Uniform elongation of the lamellar UFG samples decreased with increasing the ECAP passage while both uniform and total elongations of the equiaxed UFG samples increased. In the case of route A producing the lamellar UFG structure, the fractions of high angle grain boundaries and grains less than 0.5 mm increased significantly but an analysis revealed that the dislocation free length decreased with increasing the ECAP passage. For route B c resulting in the equiaxed UFG structure, the fraction of high angle grain boundaries increased but the grain size distribution and the dislocation free length remained nearly unchanged with increasing the ECAP passage. From the present experiments and analyses, it was found that tensile ductility of lamellar UFG OFHC Cu is primarily controlled by the dislocation free length and that of the equiaxed one is mainly dependent on the fraction of high angle grain boundaries.

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Section: Dislocation Free Lengthmentioning

confidence: 99%

Section: Dislocation Free Lengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Factors Influencing Tensile Ductility of OFHC Cu Having Different Ultrafine Grained Structures

et al. 2010

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“…Es kann gezeigt werden, dass die durch den ECAP-Prozess entstandenen Kleinwinkelkorngrenzen im Vergleich zu Großwinkelkorngrenzen stärker den Aufbau einer Rückspannung bewirken [12].…”

Section: Diskussion Der Experimentellen Ergebnisseunclassified

Experimentelle und phänomenologische Beschreibung des mechanischen Verhaltens der Aluminiumlegierung EN AW‐7075 nach großer plastischer Vorverformung

Shutov¹,

Hockauf

Halle

et al. 2009

Materialwissenschaft Werkst

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“…Haouaoui et al prepared small tension test specimens from an ECAP-processed Cu bar along three orthogonal directions and reported that strength anisotropy including the directiondependent Bauschinger effect was obviously present. 21) Yapici et al examined tensioncompression asymmetry in ECAP-processed Cu and compared their results with computation results based on a viscoplastic self-consistent model. 22) They claimed that the anisotropy arises not only from crystallographic texture but also from directional substructure.…”

Section: Positron Annihilation Behavior Of Ecap-processed Samplesmentioning

confidence: 99%

Bulky Averaged Microscopic Information for ECAP-Processed Cu Using Accelerator-Based Gamma-Ray-Induced Positron Annihilation Spectroscopy and Neutron Diffraction

et al. 2013

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Bulky averaged microstructural parameters such as vacancy density, texture and intergranular stress for 99.99% Cu subjected to equalchannel angular pressing (ECAP) were investigated using accelerator-based gamma-ray-induced positron annihilation spectroscopy (AIPAS) and neutron diffraction. The Doppler-broadening parameter S for the AIPAS positron annihilation peaks increased after the first ECAP cycle and then decreased slightly with additional ECAP cycles. When the samples were annealed, the S value for the sample subjected to eight ECAP cycles was found to decrease at a lower temperature than that for the sample subjected to one ECAP cycle. The texture and intergranular stresses generated by ECAP were determined by neutron diffraction analyses. Changes in full width at half maximum and intensity of the (111) and (200) neutron diffraction peaks monitored in situ during annealing indicated the early onset of recrystallization in the sample subjected to eight ECAP cycles. These bulky averaged data show good agreement with both local scanning electron microscopy/electron backscatter diffraction observations and the results of mechanical tests.

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Flow stress anisotropy and Bauschinger effect in ultrafine grained copper

Cited by 82 publications

References 48 publications

Factors Influencing Tensile Ductility of OFHC Cu Having Different Ultrafine Grained Structures

Factors Influencing Tensile Ductility of OFHC Cu Having Different Ultrafine Grained Structures

Experimentelle und phänomenologische Beschreibung des mechanischen Verhaltens der Aluminiumlegierung EN AW‐7075 nach großer plastischer Vorverformung

Bulky Averaged Microscopic Information for ECAP-Processed Cu Using Accelerator-Based Gamma-Ray-Induced Positron Annihilation Spectroscopy and Neutron Diffraction

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