Distribution of dislocations and twins in copper and 18Cr-10Ni-Ti steel under shock-wave loading

Atroshenko, S. A.; Mayer, Alexander E.

doi:10.1134/s1063784214080076

Cited by 13 publications

(9 citation statements)

References 22 publications

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“…3 и 4). В работе [9] при изучении этой стали после ударно-волнового нагружения ударником со скоростью 229 м/c также наблюдалось образование двойников. В большинстве случаев микродвойники формируют большие скопления, в которых они в основном принадлежат к одной системе двойникования (рис.…”

Section: результаты и обсуждениеunclassified

An electron-microscopic study of the deformation structure of the 12kh18n10t steel after explosive loading in spherical systems

Добромыслов¹,

Талуц²

2015

DREAM

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Optical metallography, transmission electron microscopy and microhardness measurements are used to investigate the deformed structure of retained shells made of the 12Kh18N10T steel after explosive loading. It has been established that the high-rate plastic deformation of the steel under this loading occurs both by slipping and twinning. It is shown that there is a strong localization of deformation resulted in the formation of rough traces of slip. The high pressure at the shock wave front results in the fact that the critical shear stress in one grain is achieved in several slip systems simultaneously, irrespective of the Schmid factor. Therefore, several nonequivalent systems become active slip systems at once. Microtwins form large clusters in which they mainly belong to one or two systems of twinning. The average thickness of microtwins is ~ 30-40 nm. Polymorphic γ → α transformation has been revealed under explosive loading. The α-phase is observed in the form of fine precipitates. It has been found that the microhardness almost doubles after shock loading, as compared with that of the initial state. Transactions A, 1982, vol. 13, iss. 4, pp. 627-635. DOI: 10.1007/BF02644428. 5. KeywordsMalloy S.A., Gray III G. T., Cady C.M., Rutherford R.W., Hihson R.S. The influence of explosive-driven "taylor-wave" shock prestraining on the structure/property behavior of 304 stainless steel. Metallurgical and Materials Transactions A, 2004, vol. 35, iss. 9, pp. 2617-2624. DOI: 10.1007.Firraro D., Matteis P., Scavino G., Ubertalli G., Ienco M. G., Pellati G., Piccardo P., Pinasco M.R., Stagno E., Montanari R., Tata M.E., Brandimarte G., Petralia S., Mechanical twins in 304 stainless steel after small-charge explosion.

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Section: результаты и обсуждениеunclassified

An electron-microscopic study of the deformation structure of the 12kh18n10t steel after explosive loading in spherical systems

Добромыслов¹,

Талуц²

2015

DREAM

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“…where TW  is the deformation of twinned material, which is from the concentration and size of twins, which are determined in accordance with [6].…”

Section: Twinningmentioning

confidence: 99%

“…The dislocation plasticity model [4], the grain boundary sliding model [5] and the mechanical twinning model [6] are used for determination of shear stresses and density of lattice defects. Various combinations of these three plasticity mechanisms can reveal themselves depending on the material and the irradiation conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of physical processes and structural changes in metals under intensive irradiation with use of CRS code: dislocations, twinning, evaporation and stress waves

Mayer

Krasnikov

Mayer

2014

J. Phys.: Conf. Ser.

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“…Twinning becomes an alternative plasticity mechanism at low temperatures and high strain rates [1,6,7]; it occurs if value of the stacking fault energy is less than 100 mJ/m 2 , which is the case for copper, steel and for many alloys. Mechanical twinning reveals itself in many dynamical processes including the Taylor impact tests [8,9] applied to a metal with a low value of the stacking fault energy.…”

Section: Introductionmentioning

confidence: 99%

Kinetic model for mechanical twinning and its application for intensive loading of metals

Mayer

2015

EPJ Web of Conferences

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Abstract. In this report, we present our twinning model intended for simulation of the dynamic deformation of metals with low values of the stacking fault energy, as well as the results of application of the model to numerical simulation of intensive loading of metals. Generation of a twin is described as an appearance of a stacking fault with size more than some critical value, while growth of a twin is considered as a cooperative movement of partial dislocation along the stacking fault. The twin nucleation rate is expressed through the energy released due to annihilation of dislocations. Movement of partial dislocations in the course of twin growth passes under the action of elastic stress field and phonon drag. The surface energy of the growing twin continuously increases which leads to the appearance of an additional force. Application of this model allows us to investigate plastic response of metals at various dynamic loading conditions and initial defect structures. Influence of twinning at Taylor rod compaction experiments is analyzed including formation of the shape of the lateral surface.

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Distribution of dislocations and twins in copper and 18Cr-10Ni-Ti steel under shock-wave loading

Cited by 13 publications

References 22 publications

An electron-microscopic study of the deformation structure of the 12kh18n10t steel after explosive loading in spherical systems

An electron-microscopic study of the deformation structure of the 12kh18n10t steel after explosive loading in spherical systems

Numerical modelling of physical processes and structural changes in metals under intensive irradiation with use of CRS code: dislocations, twinning, evaporation and stress waves

Kinetic model for mechanical twinning and its application for intensive loading of metals

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