Plastic relaxation of the internal stress induced by twinning

Barnett, Matthew; Stanford, Nicole; Ghaderi, Alireza; Siska, Filip

doi:10.1016/j.actamat.2013.09.024

Cited by 78 publications

(29 citation statements)

References 20 publications

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“…When a grain completely changes his initial orientation as a consequence of the extension twinning, or the twin growth is limited (e.g. owing to the back-stresses induced by the neighboring grains [24]), the further deformation is substantiated by activation of a new mechanism. The dislocation slip in the second order ({1122} 11 23 ) pyramidal plane, accommodating strain along the crystal c−axis and oering ve independent slip systems is the possibility, which was found out and studied both experimentally [7,25] and theoretically [26].…”

Section: Resultsmentioning

confidence: 99%

Effect of Loading Mode on the Evolution of the Dislocation Structure in Magnesium

et al. 2015

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The evolution of the dislocation structure in randomly textured cast magnesium as a function of loading mode is studied using whole neutron diraction pattern line prole analysis and elasto-plastic self-consistent modeling. Both the experimental results and the theoretical data indicate the onset of basal slip at low stresses and the key role of prismatic slip in the macroscopic yield. Dependence of the second-order pyramidal slip on the loading mode is revealed.

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Section: Resultsmentioning

confidence: 99%

Effect of Loading Mode on the Evolution of the Dislocation Structure in Magnesium

et al. 2015

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“…It is well known that mechanical twins can relax elastic energy stored in the matrix, concentrate applied stresses at their tips and transmit the stress over twin interfaces and into their interior [59]. Another possible manner of twin is to form different defect configurations (e.g.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Spectroscopy Of Bearing Steel

Lü

et al. 2015

Archives of Metallurgy and Materials

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This study presents mechanical spectroscopy of bearing steel subjected to different heat treatments. A non-thermally activated maximum, P1, was found at 130°C, in quenched martensitic samples, which were austenitized at 1050°C and 860°C, and presented twin martensite microstructures. It is suggested that the mechanism of the P1 maximum, observed on the lowtemperature side of Snoek-Köster peak, is related to the change of defect configurations in twinned martensite assisted with high mobility of the solute carbon atoms under an external harmonic stress field applied during mechanical loss measurements.Keywords: Bearing steel, twin martensite, carbon atoms, mechanical spectroscopy, internal friction, Snoek-Köster peak W pracy przedstawiono wyniki badań spektroskopii mechanicznej stali łożyskowej poddanej różnej obróbce cieplnej. W hartowanych martenzytycznych próbkach, które były austenityzowane w 1050°C i 860°C, i posiadały bliźniaczą mikrostrukturę martenzytu, występuje nietermicznie aktywowane maksimum P1 przy 130°C. Sugeruje się, że mechanizm maksimum P1, które występuje na niskotemperaturowym zboczu piku Snoek-Köstera, związane jest ze zmianą konfiguracji defektów w bliźniaczym martenzycie, przy wysokiej ruchliwości atomów węgla. Maksimum P1 ujawnia się pod wpływem działania harmonicznie zmiennego zewnętrznego pola naprężeń przyłożonego do próbki w trakcie badań metodą spektroskopii mechanicznej.

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“…Decreasing the extent of plastic relaxation by a half leads to a slightly lower hardening increment near yield but provides greater apparent rates of strain hardening. According to finite element simulations recently carried out (Barnett et al, 2013b), such changes in plastic relaxation could be realised by changes in the critical resolved shear stress for prismatic slip.…”

Section: Strengthmentioning

confidence: 99%

“…(El Kadiri et al, 2013a)). In the present work, we will assume a near linear relation between twin aspect ratio and the resolved shear stress (Barnett et al, 2013b).…”

Section: Accepted Manuscriptmentioning

confidence: 99%