Deformation of wrought uranium: Experiments and modeling

McCabe, Rodney J.; Capolungo, Laurent; Marshall, P.; Cady, Carl M.; Tomé, Carlos N.

doi:10.1016/j.actamat.2010.06.021

Cited by 64 publications

(74 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The heterogeneity in twin formation is conventionally attributed to local stress fluctuations and the statistical nature of twinning 21,22,29 . Adopting a different viewpoint, we believe that the observed heterogeneity calls for statistically significant sampling to reveal meaningful microstructure/twin correlations.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The critical role of grain orientation and applied stress in nanoscale twinning

McCabe¹,

Beyerlein

Carpenter³

et al. 2014

Nat Commun

View full text Add to dashboard Cite

Numerous recent studies have focused on the effects of grain size on deformation twinning in nanocrystalline fcc metals. However, grain size alone cannot explain many observed twinning characteristics. Here we show that the propensity for twinning is dependent on the applied stress, grain orientation and stacking fault energy. The lone factor for twinning dependent on grain size is the stress necessary to nucleate partial dislocations from a boundary. We use bulk processing of controlled nanostructures coupled with unique orientation mapping at the nanoscale to show the profound effect of crystal orientation on deformation twinning. Our theoretical model reveals an orientation-dependent critical threshold stress for twinning, which is presented in the form of a generalized twinnability map. Our findings provide a newfound orientation-based explanation for the grain size effect: as grain size decreases the applied stress needed for further deformation increases, thereby allowing more orientations to reach the threshold stress for twinning.

show abstract

Section: Resultsmentioning

confidence: 99%

“…In CG metals, the crystallographic orientation of the grain relative to the loading direction plays a major role in twinning 14,[21][22][23] . This orientation effect is as strong as any grain size effect in CG metals.…”

mentioning

confidence: 99%

The critical role of grain orientation and applied stress in nanoscale twinning

McCabe¹,

Beyerlein

Carpenter³

et al. 2014

Nat Commun

View full text Add to dashboard Cite

show abstract

“…The h310i{130} twin mode has two twin variants. It is the most widely observed twinning mode and is a compound twin with a shear of 0.299 [1,6,10]. The h312i{172} twinning mode has four twin variants and is a type II twin with a shear of 0.227 [1,6,11].…”

Section: ↵-Uraniummentioning

confidence: 99%

“…the flow stress) to the accumulated plastic strain (or more rigorously, to the plastic 'state' of the material). This is often expressed in terms of dislocation densities [1,8,24,25,26]. In EPSC, this hardening plays a critical part of the iterative solution of the problem during each straining step, but in EVPSC and VPSC the hardening rule is handled separately as an update to the constitutive parameters at the end of each straining step.…”

Section: Self-consistent Modelingmentioning

confidence: 99%