Yield phenomena in polycrystalline copper

Titchener, AL; Davies, G. J.

doi:10.1080/14786436508224931

Cited by 13 publications

(3 citation statements)

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“…The definition of unloading yield includes tests with fully unloading and reloading (FUR) and repeated stress relaxation tests (RSR), which means no limitation regarding the magnitude of unloading. In addition, different synonyms are used for the unloading yield effect like "strain aging" [2], "yield effect" [3] and "yield point effect" [4]. Besides of magnesium alloys, the effect was observed for titanium alloys [5] and copper [3].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, different synonyms are used for the unloading yield effect like "strain aging" [2], "yield effect" [3] and "yield point effect" [4]. Besides of magnesium alloys, the effect was observed for titanium alloys [5] and copper [3]. Titchener et al [3] assumed that the intensity of the unloading yield effect, the increase of subsequent yield stress, depends on the amount of the introduced stress, the purity, the grain size, the rate of unloading and the time with reduced load.…”

Section: Introductionmentioning

confidence: 99%

“…Besides of magnesium alloys, the effect was observed for titanium alloys [5] and copper [3]. Titchener et al [3] assumed that the intensity of the unloading yield effect, the increase of subsequent yield stress, depends on the amount of the introduced stress, the purity, the grain size, the rate of unloading and the time with reduced load. Supplementary, Birnbaum [6] observed an additional dependency of the yield drop on the crystal orientation for copper single crystals.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Unloading Yield Effect in Aluminum and Magnesium Sheet Metal Alloys at Room Temperature

Degner

Suttner

Merklein

2016

KEM

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The reduction of CO2-emissions and the lowering of fuel consumption are two main objectives in the automotive industry. To reach these targets, conventional materials like deep drawing steels are substituted by new modern lightweight materials such as aluminum and magnesium alloys. During forming of sheet metal parts, the material experiences a plastic deformation, which can affect the part quality regarding the amount of springback or the occurrence of stretcher strain marks. In this context, a time dependent change of the material behavior can emerge after removing the part from the forming tool. Within this contribution, the influence of pre-strain and the unloading yield effect on the subsequent mechanical behavior of the aluminum alloy AA7020 and the magnesium alloy AZ31B are investigated. Additionally, the time dependency of mechanical properties is analyzed for different aging times from 5 seconds to one week after pre-straining. The results show a significant increase of unloading yield effect with increasing pre-strain during uniaxial tension.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the Unloading Yield Effect in Aluminum and Magnesium Sheet Metal Alloys at Room Temperature

Degner

Suttner

Merklein

2016

KEM

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Yield points during cyclic strain of a Cu–7.5% al alloy

Thompson

1974

Phys. Stat. Sol. (a)

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Constant strain amplitude cycling (Δϵp = 0.00275) of Cu–7.5% Al specimens causes development of a yield plateau after five cycles and an increasing yield drop thereafter. Several features are consistent with the known re‐loading yield point behavior of f.c.c. metals, such as a linear relation between yield drop and flow stress. The magnitude of the drop is time‐independent for times below 1000 s. It is suggested that the dislocation rearrangements responsible for the yield point might include dipole formation during unloading, a behavior consistent with the fatigue literature and other considerations.

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The Temperature Dependence of the Flow Stress of Copper Single Crystals

Bullen¹,

Cousland²

1968

Physica Status Solidi (b)

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It is shown that the Cottrell-Stokes ratios of copper single crystals are not constant during tensile deformation in stages I1 and I11 at temperatures from 77 to 443 OK. However, there appears to be a fixed relationship between the Cottrell-Stokes ratio and the,flow stress (as measured a t a standard temperature). This relationship is independent of crystal orientation and the temperature or stage of deformation. The relationship is similar to that previously reported for polycrystalline copper [ 11, although not quantitatively identical. These relationships have been interpreted as evidence that the obstacles responsible for temperature-dependent hardening are formed by the action of stresses from arrays of primary dislocations. The nature of the unloading yield point and its relevance to the reversible change in flow stress are also discussed.

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Yield phenomena in polycrystalline copper

Cited by 13 publications

References 13 publications

Investigation of the Unloading Yield Effect in Aluminum and Magnesium Sheet Metal Alloys at Room Temperature

Investigation of the Unloading Yield Effect in Aluminum and Magnesium Sheet Metal Alloys at Room Temperature

Yield points during cyclic strain of a Cu–7.5% al alloy

The Temperature Dependence of the Flow Stress of Copper Single Crystals

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