Role of twinning in the hardening response of zirconium during temperature reloads

Kaschner, G.C.; Tomé, Carlos N.; Beyerlein, Irene J.; Vogel, Sven C.; Brown, Donald W.; McCabe, Rodney J.

doi:10.1016/j.actamat.2006.02.036

Cited by 152 publications

(102 citation statements)

References 16 publications

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“…This inflection has also been seen previously during the in-plane compression of high-purity Zr and is indicative of twinning. [17,18] At small strains (<0.1), the flow stresses during ND compression are higher than those during RD compression. This is a direct consequence of the texture of the material which makes the easier prismatic slip much more likely for compression along RD than along ND.…”

Section: Mechanical Behaviormentioning

confidence: 99%

Grain Breakup During Elevated Temperature Deformation of an HCP Metal

Honniball

Preuss

Rugg

et al. 2015

Metall Mater Trans A

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A combination of mechanical testing, EBSD and crystal plasticity finite element modeling were used to investigate the influence of temperature on the fragmentation of grains in a zirconium alloy. The results demonstrate that grains of Zircaloy-4 fragment more as the temperature rises. This trend can be explained by an increasing difference between the CRSS values for hc+ai slip and hai slip as temperature rises. This change in relative slip activities with temperature is supported by experimental observations of macroscopic anisotropy and in-grain misorientation axes calculated from EBSD data, as well as plasticity modeling. By tracking the microstructural evolution during deformation, it is shown that the two major texture components fragment to different degrees under the action of prismatic slip. Grains in the 1120 fiber are significantly more stable than those in the 1010 fiber, which break up. Grains of the latter fiber fragment heterogeneously as portions of the grain rotate in opposite directions, and some do not rotate at all.

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Section: Mechanical Behaviormentioning

confidence: 99%

Grain Breakup During Elevated Temperature Deformation of an HCP Metal

Honniball

Preuss

Rugg

et al. 2015

Metall Mater Trans A

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“…Most constitutive models resort to a deterministic critical resolved shear stress (CRSS)-based law for describing nucleation and subsequent propagation, e.g. Tomé et al (2001), Salem et al (2005), Kaschner et al (2006) and Proust et al (2007). Regardless of the length scale to which it is characterized or applied, the critical drawback of the twin CRSS concept that is often overlooked is that it usually amounts to a deterministic treatment of twin nucleation.…”

Section: (B) Theoretical Backgroundmentioning

confidence: 99%

A probabilistic twin nucleation model for HCP polycrystalline metals

2010

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This article presents a basic probabilistic theory for the nucleation of deformation twins in hexagonal close packed (HCP) metals. Twin nucleation is assumed to rely on the dissociation of grain boundary defects (GBDs) under stress into the required number of twinning partials to create a twin nucleus. The number of successful conversion events is considered to follow a stochastic Poisson process where the rate is assumed to increase with local stress. From this concept, the probability distribution for the critical stress to form a twin nucleus is derived wherein the parameters of the distribution are related to properties of the GBDs. The theory is implemented into a multi-scale constitutive model for HCP metals in order to test its predictive capability against measurements made previously on pure zirconium deformed at 76 and 300 K.

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“…It has been well accepted that twin boundaries are equivalent to conventional grain boundaries with respect to the H-P effect [306][307][308][309][310][311][312], i.e., the same H-P slope for both twin boundaries and grain boundaries [290], because twin boundaries are strong barriers for dislocation motion [310][311][312][313]. Significant enhancement of tensile strength in copper [40,314] and hardness in fcc c phase 330 stainless steel thin films [315] as well as fcc Cu/330 stainless steel multilayer films [316,317] was achieved by nano twins.…”

Section: Strength and Ductilitymentioning

confidence: 99%