The effect of inclusions on the fracture of uranium

Davies, D.; Martin, J.W.

doi:10.1016/0022-3115(61)90003-4

Cited by 16 publications

(6 citation statements)

References 1 publication

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“…The existence of inclusions can destroy the continuity of the matrix, and when the inclusion is noncoherent with the matrix, stress will exist at the interface. Inclusions in matrix can lead to a significant reduction of the elongation, meanwhile, inclusions exposed on the surface will destroy the continuity of the material, form galvanic couple in the humid environment and often become the nucleation site during the hydrogen corrosion process [23-26]. It is known that the deformation of monoclinic α″-phase U–5.7Nb alloy at room temperature is mainly due to the formation of twins and the migration of the twin interface.…”

Section: Resultsmentioning

confidence: 99%

Effect of surface rolling extrusion processing on corrosion resistance of U–5.7Nb alloy

Liu

Cai

et al. 2022

Materials Science and Technology

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Surface rolling extrusion processing is applied to reconstruct the microstructure of U–5.7Nb alloy. A micro–nano structure layer is formed on the surface, at the same time the inclusions in the surface are also refined and the uniformity of niobium element distribution is improved. The corrosion resistance test indicates that, the corrosion rate of the material is accelerated, but the stability of oxide film formed on the surface of U–5.7Nb alloy after rolling is better. The modified layer with uniform structure formed by rolling can eliminate the uneven potential distribution of turning, thereby improves the local corrosion resistance of U–5.7Nb alloy.

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Section: Resultsmentioning

confidence: 99%

Effect of surface rolling extrusion processing on corrosion resistance of U–5.7Nb alloy

Liu

Cai

et al. 2022

Materials Science and Technology

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“…Four shape functions are used to interpolate the separation vector on the x m ,ŷ m plane (Cook 1995):…”

Section: Appendix A: Shape Functions Of the Cohesive Elementmentioning

confidence: 99%

Coupling a discrete twin model with cohesive elements to understand twin-induced fracture

2021

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The interplay between twinning and fracture in metals under deformation is an open question. The plastic strain concentration created by twin bands can induce large stresses on the grain boundaries. We present simulations in which a continuum model describing discrete twins is coupled with a crystal plasticity finite element model and a cohesive zone model for intergranular fracture. The discrete twin model can predict twin nucleation, propagation, growth and the correct twin thickness. Therefore, the plastic strain concentration in the twin band can be modelled. The cohesive zone model is based on a bilinear traction-separation law in which the damage is caused by the normal stress on the grain boundary. An algorithm is developed to generate interface elements at the grain boundaries that satisfy the traction-separation law. The model is calibrated by comparing polycrystal simulations with the experimentally observed strain to failure and maximum stress. The dynamics of twin and crack nucleation have been investigated. First, twins nucleate and propagate in a grain, then, microcracks form near the intersection between twin tips and grain boundaries. Microcracks appear at multiple locations before merging. A propagating crack can nucleate additional twins starting from the grain boundary, a few micrometres away from the original crack nucleation site. This model can be used to understand which type of texture is more resistant against crack nucleation and propagation in cast metals in which twinning is a deformation mechanism. The code is available online at https://github.com/TarletonGroup/CrystalPlasticity. Graphic Abstract

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“…Once the solubility limit is surpassed, UC forms which has a significantly higher melting point than the metal (~1400 K for pure U versus ~2800 K for UC, see the phase diagrams produced by Chevalier and Fischer [25]). The carbide is also much less ductile, which may contribute to deformation and fracture of the metal [26]. It is important to understand the formation and evolution of these second phase particles to be able to better predict their effects on the final product after various processing methods.…”

Section: Introductionmentioning

confidence: 99%

Phase field model of uranium carbide solidification through a combined KKS and orientation field approach

Bair¹,

Abrecht²,

Reilly³

et al. 2019

J. Phys.: Condens. Matter

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A Phase Field model is developed combining the Orientation Field approach to modeling solidification with the Kim, Kim, Suzuki method of modeling binary alloys. These combined methods produce a model capable of simulating randomly oriented second phase dendrites with discrete control of the solid-liquid interface energy and thickness. The example system of carbon in a liquid uranium (U) melt is used as a test for the model. The formation of uranium carbide within a liquid U melt is simulated for isothermal conditions and compares well with experiments.

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The effect of inclusions on the fracture of uranium

Cited by 16 publications

References 1 publication

Effect of surface rolling extrusion processing on corrosion resistance of U–5.7Nb alloy

Effect of surface rolling extrusion processing on corrosion resistance of U–5.7Nb alloy

Coupling a discrete twin model with cohesive elements to understand twin-induced fracture

Phase field model of uranium carbide solidification through a combined KKS and orientation field approach

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