A study of the bauschinger effect in AlCu alloys

Moan, G.D.; Embury, J.D.

doi:10.1016/0001-6160(79)90125-1

Cited by 108 publications

(59 citation statements)

References 7 publications

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“…Gutierrez-Urrutia et al [48] applied the same approach to compare their results in an analogous experiment. Although the offset reverse strain method is very sensitive to the value of the chosen reverse strain [49], applying a 0.2% offset reverse strain to the current results returned a back stress contribution which was ~20% of the maximum stress at the end of the first tension half cycle.…”

Section: The Bauschinger Effectmentioning

confidence: 64%

On the evolution and modelling of lattice strains during the cyclic loading of TWIP steel

et al. 2013

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The evolution of lattice strains in fully annealed Fe-24Mn-3Al-2Si-1Ni-0.06C twinning-induced plasticity (TWIP) steel is investigated via in situ neutron diffraction during cyclic (tension-compression) loading between strain limits of ±1%. The pronounced Bauschinger effect observed upon load reversal is accounted for by a combination of the intergranular residual stresses and the intragranular sources of back stress, such as dislocation pile-ups at the intersection of stacking faults. The recently modified elasto-plastic self-consistent (EPSC) model which empirically accounts for both intergranular and intragranular back stresses has been successfully used to simulate the macroscopic stress-strain response and the evolution of the lattice strains. The EPSC model captures the experimentally observed tension-compression asymmetry as it accounts for the directionality of twinning as well as Schmid factor considerations. For the strain limits used in this study, the EPSC model also predicts that the lower flow stress on reverse shear loading reported in earlier Bauschinger-type experiments on TWIP steel is a geometrical or loading path effect. AbstractThe evolution of lattice strains in fully annealed Fe-24Mn-3Al-2Si-1Ni-0.06C TWinning Induced Plasticity (TWIP) steel is investigated via in-situ neutron diffraction during cyclic (tensioncompression) loading between strain limits of ±1%. The pronounced Bauschinger effect observed upon load reversal is accounted for by a combination of the intergranular residual stresses and the intragranular sources of back stress such as dislocation pile-ups at the intersection of stacking faults.The recently modified Elasto-Plastic Self-Consistent (EPSC) model which empirically accounts for both intergranular and intragranular back stresses has been successfully used to simulate the macroscopic stress-strain response and the evolution of the lattice strains. The EPSC model captures the experimentally observed tension-compression asymmetry as it accounts for the directionality of twinning as well as Schmid factor considerations. For the strain limits used in this study, the EPSC model also predicts that the lower flow stress on reverse shear loading reported in earlier Bauschinger-type experiments on TWIP steel is a geometrical or loading path effect.

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Section: The Bauschinger Effectmentioning

confidence: 64%

On the evolution and modelling of lattice strains during the cyclic loading of TWIP steel

et al. 2013

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“…The most common explanation for the hysteresis loops in interrupted tensile tests is based on the back stresses resulting from inhomogeneous plastic deformation [36,38,54,55]. Here, the macroscopic stress is separated into the internal stress (s back ) and effective stress (s eff ) [56].…”

Section: Strain Hardening Due To Back Stressesmentioning

confidence: 99%

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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Keywords:High specific strength steel Dual-phase nanostructure Strain hardening Ductility In situ high-energy X-ray diffraction a b s t r a c tWe report a detailed study of the strain hardening behavior of a Fee16Mne10Ale0.86Ce5Ni (weight percent) high specific strength (i.e. yield strength-to-mass density ratio) steel (HSSS) during uniaxial tensile deformation. The dual-phase (g-austenite and B2 intermetallic compound) HSSS possesses high yield strength of 1.2e1.4 GPa and uniform elongation of 18e34%. The tensile deformation of the HSSS exhibits an initial yield-peak, followed by a transient characterized by an up-turn of the strain hardening rate. Using synchrotron based high-energy in situ X-ray diffraction, the evolution of lattice strains in both the g and B2 phases was monitored, which has disclosed an explicit elasto-plastic transition through load transfer and strain partitioning between the two phases followed by co-deformation. The unloadingreloading tests revealed the Bauschinger effect: during unloading yield in g occurs even when the applied load is still in tension. The extraordinary strain hardening rate can be attributed to the high back stresses that arise from the strain incompatibility caused by the microstructural heterogeneity in the HSSS.

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“…The early work of Byrne and co-workers [14] on Al-Cu single crystals found that there was a substantial change in macroscopic work hardening behaviour as a function of the precipitate state. A fundamental question that arose from these studies and the later work of Moan and Embury [15] was whether the enhanced work hardening behaviour observed in the Al-Cu samples (which have plate shaped precipitates) was best understood in the framework of additional storage of geometrically necessary dislocations (Ashby) or in terms of the development of long range back stress [6,16,17]. It is not possible to differentiate these theories based on monotonic tests but the use of strain reversal, i.e.…”

mentioning

confidence: 99%

“…It is not possible to differentiate these theories based on monotonic tests but the use of strain reversal, i.e. Bauschinger tests, is particularly useful for evaluating internal stresses [15,18,19].…”

mentioning

confidence: 99%