Cyclic deformation of copper single crystals oriented for double slip

Jin, N.Y.; Winter, A. T.

doi:10.1016/0001-6160(84)90001-4

Cited by 121 publications

(22 citation statements)

References 10 publications

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“…It is about τ sat. = 36 MPa (14) for copper and it agrees with the extrusion formation stress obtained in this study.…”

Section: 3 Center Of Twin Boundarysupporting

confidence: 91%

“…These Schmid factors suggest that multiple slip systems are activated simultaneously in each crystal. In fatigue of copper single crystal with multiple slip orientation, it is reported that only one slip system activates mainly after the initial interaction among the dislocations, and PSB is formed on the slip system (14), (15) .…”

Section: Crystallographic Characteristics Of Specimenmentioning

confidence: 99%

“…In a copper single crystal with coplanar slip orientation, the dislocations on the active slip plane form cell structure and the fine extrusions are formed on the surface (14) . Although the critical stress for the extrusion formation in copper single crystal with coplanar slip orientation is not clarified yet, a report suggested that the formation is dependent on the peak shear stress amplitude.…”

Section: 3 Center Of Twin Boundarymentioning

confidence: 99%

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Nucleation of Slip Bands near Twin Boundary in High-Cycle Fatigue

Sumigawa

Kitamura

2004

JSME Int. J., Ser. A

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In order to investigate the criterion for the persistent slip band (PSB) formation near a Σ3(111) coherent twin boundary, where is a preferential site for formation of PSB, a highcycle fatigue test is carried out at room temperature using a copper bicrystal specimen with the twin boundary. PSBs are observed near the boundary in the connection with the evolution of extrusion/intrusion on the specimen surface. The slip behavior is different from that predicted by the Schmid factor. A finite element method (FEM) analysis is conducted for the bicrystal, and it reveals that the increase of resolved shear stress on the specific slip system due to the constraint of deformation between the crystals is the main cause for promoting the nucleation of PSB near the twin boundary. By taking into account the interaction between the primary and the secondary slip systems, it is possible to specify the formation behavior of PSB near the twin boundary.

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“…It is about τ sat. = 36 MPa (14) for copper and it agrees with the extrusion formation stress obtained in this study.…”

Section: 3 Center Of Twin Boundarysupporting

confidence: 91%

Section: Crystallographic Characteristics Of Specimenmentioning

confidence: 99%

Section: 3 Center Of Twin Boundarymentioning

confidence: 99%

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Nucleation of Slip Bands near Twin Boundary in High-Cycle Fatigue

Sumigawa

Kitamura

2004

JSME Int. J., Ser. A

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“…In most crystals, slip occurs on well-characterized crystallographic planes and directions, known as slip systems. The observed microstructures often consist of ostensibly dislocation-free cells or lamellae in which a small number of slip systems is activated [46,50,37,19,48,28,26].…”

Section: Introductionmentioning

confidence: 99%

Dislocation Microstructures and the Effective Behavior of Single Crystals

Conti

Ortiz

2005

Arch. Rational Mech. Anal.

117

122

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We consider single-crystal plasticity in the limiting case of infinite latent hardening, which signifies that the crystal must deform in single slip at all material points. This requirement introduces a nonconvex constraint, and thereby induces the formation of fine-scale structures. We restrict attention throughout to linearized kinematics and deformation theory of plasticity, which is appropriate for monotonic proportional loading and confers the boundary value problem of plasticity a well-defined variational structure analogous to elasticity. We first study a scale-invariant (local) problem. We show that, by developing microstructures in the form of sequential laminates of finite depth, crystals can beat the single-slip constraint, i. e., the macroscopic (relaxed) constitutive behavior is indistinguishable from multislip ideal plasticity. In a second step, we include dislocation line energies, and hence a lengthscale, into the model. Different regimes lead to several possible types of microstructure patterns. We present constructions which achieve the various optimal scaling laws, and discuss the relation with experimentally known scalings, such as the Hall-Petch law.

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“…For the present [233] orientation, dislocation reactions between the primary and coplanar slip systems produce the third Burgers vector contained in the same (111) . Such a dislocation reaction would promote the much easier formation of slightly misoriented dislocation cells during fatigue deformation [11,22], and the cell diameter is also around some hundred nanometers depending upon the applied strain amplitude [11,12]. Apparently, the dislocation cell structures directly produced by fatigue cycling are more uniformly distributed and the dislocation density is relatively lower compared with UFG microstructures.…”

Section: Dislocation Structuresmentioning

confidence: 99%

Effect of Pre-Fatigue on the Monotonic Deformation Behavior of a Coplanar Double-Slip-Oriented Cu Single Crystal

Yan

Guo

et al. 2016

Metals

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Abstract:The [233] coplanar double-slip-oriented Cu single crystals were pre-fatigued up to a saturation stage and then uniaxially tensioned or compressed to fracture. The results show that for the specimen pre-fatigued at a plastic strain amplitude γ pl of 9.2 × 10 −4 , which is located within the quasi-plateau of the cyclic stress-strain (CSS) curve, its tensile strength and elongation are coincidently improved, showing an obvious strengthening effect by low-cycle fatigue (LCF) training. However, for the crystal specimens pre-fatigued at a γ pl lower or higher than the quasi-plateau region, due to a low pre-cyclic hardening or the pre-induction of fatigue damage, no marked strengthening effect by LCF training occurs, and even a weakening effect by LCF damage takes place instead. In contrast, the effect of pre-fatigue deformation on the uniaxial compressive behavior is not so significant, since the compressive deformation is in a stress state more beneficial to the ongoing plastic deformation and it is insensitive to the damage induced by pre-cycling. Based on the observations and comparisons of deformation features and dislocation structures in the uniaxially deformed [233] crystal specimens which have been pre-fatigued at different γ pl , the micro-mechanisms for the effect of pre-fatigue on the static mechanical behavior are discussed.

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Cyclic deformation of copper single crystals oriented for double slip

Cited by 121 publications

References 10 publications

Nucleation of Slip Bands near Twin Boundary in High-Cycle Fatigue

Nucleation of Slip Bands near Twin Boundary in High-Cycle Fatigue

Dislocation Microstructures and the Effective Behavior of Single Crystals

Effect of Pre-Fatigue on the Monotonic Deformation Behavior of a Coplanar Double-Slip-Oriented Cu Single Crystal

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