An electron microscope study of the origin of latent hardening in NaCl

Appel, F.

doi:10.1080/01418619108204593

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…The interaction stresses are as high as the yield stress of the material and do not only tend to immobilize the dislocations, but also induce extended cross slip (Appel, 1991). Thus, many jogs formed in the intersecting dislocations are significantly higher than those expected from the simple intersection geometry according to the mutual orientation of their Burgers vectors.…”

Section: Jog Dragging and Debris Hardeningmentioning

confidence: 90%

Role of vacancies in work hardening and fatigue of TiAl alloys

Appel

Herrmann

Fischer

et al. 2013

International Journal of Plasticity

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The role of vacancies in work hardening and fatigue of TiAl alloys was investigated by mechanical testing and TEM examination of deformed samples. The evolution of the dislocation glide resistance during straining and after recovery was analyzed in terms of thermodynamic glide parameters. Strain path change tests with respect to temperature and recovery experiments were performed in order to characterize the thermal stability of the produced defect structures. The recovery of the deformation induced defect structure was observed by TEM in situ heating experiments. The recovery kinetics is described on the basis of a recently published simulation study of vacancy annihilation.

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Section: Jog Dragging and Debris Hardeningmentioning

confidence: 90%

Role of vacancies in work hardening and fatigue of TiAl alloys

Appel

Herrmann

Fischer

et al. 2013

International Journal of Plasticity

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“…According to microstructural observations [1,2], dislocations on different slip system interact with each other, which necessarily leads to coupled hardening rules. For instance, it was reported that non-active slip systems strain-harden faster than active slip systems [3] due to interactions between dislocations on the different slip planes.…”

Section: Slip System Hardening Rulesmentioning

confidence: 99%

“…The linearization scheme upon the grain level constitutive equation in the solver is chosen as the n-eff among others, for it is an intermediate scheme that results in solutions embraced by the other two bounds, secant and tangent. 1 For each segmented deformation step, yield locus on the plane stress space is monitored.…”

Section: Simulation Proceduresmentioning

confidence: 99%

Microstructural and Crystallographic Aspects of Yield Surface Evolution

Jeong¹,

Barlat²,

Lee³

2011

MSF

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The microstructural and crystallographic aspects, reflected at the macroscopic scale on yield surface and its subsequent evolution, are reappraised by application of crystal plasticity simulations. Strain hardening rule in the slip system is coupled to cope with latent hardening and Bauschinger effect. Uniaxial tension simulation on an isotropic polycrystalline aggregate leads to anisotropic strain hardening. Typical elements of phenomenological plastic anisotropy and hardening rules such as expansion, kinematic shift and distortion of the yield surface, are shown to be featured in crystal plasticity by tuning the slip system hardening rules appropriately.

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