Molecular dynamics simulation of fast dislocations in copper

Tsuzuki, Hélio; Branı́cio, Paulo S.; Rino, José Pedro

doi:10.1016/j.actamat.2008.12.025

Cited by 54 publications

(51 citation statements)

References 34 publications

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“…Hirth and Lothe (1991) identified this as an instability of the core of the dislocation. Kinematic generation of dislocations remains a largely unexplored area; however, it has been described in some MD simulations, notably by Weinee and Pear (1975), Schiotz, Jacobsen, and Nielsen (1995), Koizumi, Kirchner, and Suzuki (2002), and Tsuzuki, Branicio, and Rino (2009). In the latter two, the dissociation was not identified as such, but core instabilities were reported nonetheless.…”

Section: Core Instabilities and Kinematic Generationmentioning

confidence: 92%

Dynamic Discrete Dislocation Plasticity

Gurrutxaga-Lerma

Balint

Dini

et al. 2014

Advances in Applied Mechanics

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Section: Core Instabilities and Kinematic Generationmentioning

confidence: 92%

Dynamic Discrete Dislocation Plasticity

Gurrutxaga-Lerma

Balint

Dini

et al. 2014

Advances in Applied Mechanics

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“…So, the distinctions of the forming results should be related to the changes brought by the unloading and reloading processes, such as the annihilation or rearrangement of dislocations [14][15][16] , moving of the vacancies or solute atoms and other phenomenon during the unloading process which will influence the dislocation movability during further deformation after reloading. For example, precipitated solute atoms pin movable dislocation to form "cottrell atomsphere" [17] which will make the movable dislocation move difficult.…”

Section: Analysis Of Deformation Mechanismmentioning

confidence: 99%

Influence of loading path on formability of 304 stainless steel tubes

Zhang

Yuan

Wang

et al. 2009

Sci. China Ser. E-Technol. Sci.

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The loading path affects the metal formability remarkably in tube hydroforming, and it is also one of the research focuses. Recently, some scholars abroad proposed a new fluctuant hydraulic loading method, which can improve the formability of tubes in hydroforming. Related studies have shown that this new loading method can improve the tube formability, the distribution of deformation is more uniform and this is useful for avoiding excessive local thinning. In this paper, tube hydroforming experiments without axial feeding were carried out; the influences of the loading methods on formability of stainless steel tubes were studied. Through the comparison of the experimental results under the condition of monotonous increase loading and fluctuation hydraulic loading, the outside diameter distribution, the thickness distribution and the crack expansion forms of deformation zone all fully prove that the uniformity of the distribution of tube deformation and formability have been increased significantly under the condition of fluctuation loading without axial feeding, the reasons should be distinguished from the fluctuation hydroforming with axial feeding. In order to study the forming mechanism, uniaxial tensile test of tubes similar to fluctuation loading deformation is designed in this paper, namely intermittent tensile test. It is found that intermittent uniaxial stretch can improve the tube elongation at fracture by about 40% and the deformation distribution is more uniform than that through uniaxial tensile test of the stainless steel tube. In the process of intermittent tensile tests, changes of metal microstructures brought by the loading and unloading processes are the main reasons that improve the formability of the tubes. loading path, formability, tube, stainless steel Tube hydroforming technology with the characteristics of light weight and integration has been a hot issue in the plastic working field, and has been attractive in automobile industry, also in fields of aviation, aerospace and kitchen as a forming process of hollow products for satisfying the requirement of light weight, shortage of energy and increasing demands for environment protection [1,2] . A lot of work needs to be done as the technology is still developing. One of the issues is the research on internal pressure path. The proper matching of inner pressure and axial feed (loading path) is the key of the technology [3,4] . The choice and the design of the loading path are very important in tube hydroforming, which influence the formability of the materials. The effects of loading path on the formability of the materials were studied widely [5][6][7] . With the development of the tube hydroforming technology and hydraulic pressure control technology, for the forming of hollow products with a complex shape, a pulsating hydroforming process of tubes has been developed based on the computer accurate controll and is known as one of the effective methods to improve the formability.Mori et al. [8] investigated the improvement of the

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“…Atoms from the different grains which were within 2.0 Å of each other before relaxation were deleted, giving an initial GB expansion (the volume difference between the GB cell and a corresponding number of bulk atoms, normalized by the GB area) of 0:62Å 3 =Å À2 , which is similar to those observed experimentally [63,64] for other systems. The last step before relaxation was common neighbor analysis [65,66] (CNA) with a cut-off distance of 3.85 Å to identify GB sites. Part of this structure can be seen unrelaxed in Fig.…”

Section: Site Volume Fractionsmentioning

confidence: 99%