On the nature of the yield point phenomenon

Schwab, Rainer; Ruff, Volker

doi:10.1016/j.actamat.2012.12.003

Cited by 156 publications

(84 citation statements)

References 43 publications

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“…The formation of the Lüders plateau is well documented for Al-Mg alloys (e.g., [37,38]) and is generally explained by the nucleation and propagation of a deformation band. In contrast to the repetitive PLC bands, the Lüders band propagates once, as a result of unpinning of dislocations from solute atmospheres formed during static aging prior to deformation [34,35]. This process occurs virtually without increasing the stress level because the band advances into the unhardened material.…”

Section: Stress Serrations Patternsmentioning

confidence: 99%

“…In the UFG material with a fully recrystallized microstructure, discontinuous yielding [34,35] takes place. Serrations start immediately upon the elastoplastic transition (Figure 2b).…”

Section: Stress Serrations Patternsmentioning

confidence: 99%

“…Their main feature is the persistent propagation Another distinct feature of the material processed by ECAP is the Lüders-like plateau [25,34,35] following the elastoplastic transition and superimposed with stress drops (Figure 2b). The formation of the Lüders plateau is well documented for Al-Mg alloys (e.g., [37,38]) and is generally explained by the nucleation and propagation of a deformation band.…”

Section: Plc Bands Patternsmentioning

confidence: 99%

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Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains

Lebyodkin

Lebedkina

Mogucheva

et al. 2017

Metals

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Abstract:The work addresses the effects of nanosize particles and grain refinement on the patterns of stress serrations and kinematics of deformation bands associated with the Portevin-Le Chatelier instability of plastic flow. Ultra-fine-grained microstructure was obtained using equal-channel angular pressing of the initial coarse-grained alloy. Tensile tests were carried out on flat specimens at strain rates in the range from 3 × 10 −5 to 1.4 × 10 −2 s −1 . Using local extensometry techniques, it was found that the presence of nanoscale precipitates promotes quasi-continuous propagation of deformation bands in the entire strain-rate range. The grain refinement leads to a transition to relay-race propagation at high strain rates and static strain localization at low rates. The results are discussed from the viewpoint of competition between various dynamical modes of plastic deformation associated with collective dynamics of dislocations.

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Section: Stress Serrations Patternsmentioning

confidence: 99%

“…In the UFG material with a fully recrystallized microstructure, discontinuous yielding [34,35] takes place. Serrations start immediately upon the elastoplastic transition (Figure 2b).…”

Section: Stress Serrations Patternsmentioning

confidence: 99%

Section: Plc Bands Patternsmentioning

confidence: 99%

See 1 more Smart Citation

Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains

Lebyodkin

Lebedkina

Mogucheva

et al. 2017

Metals

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“…Normally, the discontinuous yielding behavior in low carbon steels arises from the interaction between dislocations and interstitial solute atom atmospheres [7], but the mechanism of discontinuous yielding in TRIP steels has not been discovered yet [8] and it has been reported that it is supposedly related to the martensitic transformation of unstable retained austenite at the initial stage of tensile deformation [9]. This seems to be the case for the appearance of discontinuous yielding in the case of the BIT temperatures of 430°C.…”

Section: Chemically Inhomogeneous But Microstructurally Homogeneous Smentioning

confidence: 96%

Dependency of Deformation Behavior of Retained Austenite in TRIP Steels on Microstructural and Chemical Homogeneity

Azizi

Mirzadeh

Parsa

2015

Acta Metall. Sin. (Engl. Lett.)

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The room-temperature stability of the retained austenite against strain-induced martensitic transformation, its deformation behavior, the response to the bainitic isothermal treatment, the appearance of yield point elongation and other peculiarities of plastic flow, and the mechanical properties of transformation-induced plasticity (TRIP) steel were tailored based on the chemical homogeneity and the relative distribution of the retained austenite, bainite, and ferrite in the microstructure. The presence of ferritic-pearlitic banded structure in the initial microstructure resulted in an inhomogeneous TRIP microstructure, in which the retained austenite and bainite were confined to some bands and it was found to be responsible for the resultant inferior mechanical properties. The appearance of discontinuous yielding for the chemically inhomogeneous material was related to the martensitic transformation of unstable retained austenite at the initial stage of tensile deformation. These results are essential for better understanding of the behavior of advanced high-strength steels and their applications.

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“…The stress state and the reasons associated with Lüders banding were researched by Schwab and Ruff [21]. Barnett et al [14] made a major step by experimental microstructural analysis for verification of the onset of deformation twinning in Lüders bands.…”

Section: Introductionmentioning

confidence: 99%