Computer simulation of the effect of ultrasound and annealing on the structure of a two-dimensional severely deformed nanocrystalline material

Nazarova, A. A.; Dmitriev, S. P.; Baimova, Julia A.; Mulyukov, R. R.; Назаров, А. А.

doi:10.1134/s0031918x11040090

Cited by 25 publications

(17 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, in the present study for the investigation of two-dimensional crystal it is worthwhile to use simple pair potential among which the potentials of Born-Mayer, Lennard-Jones, Morse, to name a few. For example, Lennard-Jones pair potential was successfully used for investigation of effect of ultrasound and annealing on the structure of nanocrystalline material [11] and studying of plastic deformation [12][13][14][15][16][17]. Lennard-Jones function is a two parametric potential which allows one to reproduce the experimental data, for example, for interatomic potential and bonding energy, however, the rigidity of the bond will in its turn dependent on these parameters.…”

Section: Atomistic Model Of the Ordered Alloy For The Simulation Of Mmentioning

confidence: 99%

Two-dimensional model of the ordered alloy for the investigation of martensitic transformations

Babicheva¹,

Baimova²,

Dmitriev³

et al. 2015

LoM

Self Cite

View full text Add to dashboard Cite

Two-dimensional model of diatomic crystal is proposed in the present work for the investigation of martensitic transformation under thermomechanical treatment, i.e. the proposed modell allows to simulate temperature effect as well as external loading, like tension, plastic deformation, ets. The model, based on the Morse potential, which are used for the simulation of the diatomic crystal of NiTi type, which is well known as an alloy with the martensitic transformation. This model allows one to define the main characteristics of different phases as the function of one of the potential parameter at 0 K. Potential parameters for the realization of forward and reverse martensitic transformation at finite temperatures are found by the careful checking of all the values. The appearance of one preferable martensite phase is shown despite there are two possible martensite phases. The appearance of the domain boundaries is shown for the martensite phase because of the realization of two opposite direction of martensite growth. The starting and finishing temperatures of the martensitic transformation are obtained. The effect of external stresses on the course of the martensitic transformation is investigated. The potential present in this work can be perspectively used for the investigation of such processes as phase hardening in diatomic crystals.

show abstract

Section: Atomistic Model Of the Ordered Alloy For The Simulation Of Mmentioning

confidence: 99%

Two-dimensional model of the ordered alloy for the investigation of martensitic transformations

Babicheva¹,

Baimova²,

Dmitriev³

et al. 2015

LoM

Self Cite

View full text Add to dashboard Cite

show abstract

“…Atomistic simulations of the interaction of ultrasonic waves with crystal lattice defects in a two-dimensional nanocrystal has shown as well a number of interesting effects consistent with experimental data, namely, a decrease of the number of low-angle grain boundaries, relaxation of non-equilibrium grain boundaries and triple junctions avoiding grain growth, and annihilation of lattice dislocation [28]. Three-dimensional molecular dynamics simulation studies have displayed that emission of lattice dislocations by nonequilibrium grain boundaries facilitated by their internal stresses can be an underlying atomistic mechanism for the structure relaxation effects of UST in the SPD-processed materials [29,30].…”

Section: Introductionmentioning

confidence: 59%

Softening and hardening of ECAP nickel under ultrasonic treatment

Zhilyaev

Samigullina

Medvedeva

et al. 2017

Materials Science and Engineering: A

View full text Add to dashboard Cite

Abstract.Commercially pure nickel was processed by equal channel angular pressing (ECAP) through route Bc for 12 passes to obtain an ultrafine grained (UFG) microstructure and further subjected to an ultrasonic treatment (UST) which introduced a maximum amplitude equivalent to anormal stresses of 100 MPa in a steady state regime. It was observed that the microstructure of UFG Ni can be differently altered depending on the position in the sample, i.e. on the amplitude of the ultrasonic wave. The microstructural analysis demonstrated a lower dislocation density (due to the activation of recovery) at the cross section of the specimen subjected to UST at an amplitude equal to 0.8 of the maximum one, plus enhanced hardening in the cross section at the maximum amplitude.

show abstract

“…A decrease in the dimensionality of the problem by unity as compared to the realistic three dimensional case leads to the exclu sion of a number of deformation mechanisms and to an excessive simplification of properties of defects such as grain boundaries and dislocations. Neverthe less, the two dimensional problems are widely used to qualitatively simulate the mobility of grain boundaries ( ) ln , D and triple junctions [24,25], the deformation mecha nisms of single crystals [26,27], the influence of the strengthening phase particles on grain growth [18], the effect of ultrasound and annealing on the strongly nonequilibrium structure of materials after SPD [28], the impact of elongated grains on the creep deforma tion in polycrystals [29][30][31], the appearance of meso scopic bands of excited states of atoms in SPD of poly crystals. The precipitation of particles from a solid solution is not considered, since it is related to diffu sion processes (see, for example, [35]), which cannot be reproduced with sufficient accuracy by the method of molecular dynamics because it considers only fast processes.…”

Section: Simulation Of the Effect Of Strengthening Phase Particles Onmentioning

confidence: 99%

Simulation of the effect of strengthening-phase particles on the plastic deformation of a two-dimensional polycrystal

Baimova

Назаров

2012

Phys. Metals Metallogr.

Self Cite

View full text Add to dashboard Cite

The method of molecular dynamics was used to investigate the effect of strengthening phase par ticles on the process of plastic deformation in two dimensional nanocrystalline material at given temperature, hydrostatic pressure, and the maximum shear stress. We consider the deformation of a single phase nanoc rystal (material 1); a nanocrystal with particles located at grain boundaries and triple junctions and having atoms whose size is 10% larger than that of the matrix atoms (material 2), 10% less than the size of the matrix atoms (material 3), and is equal to it (material 4). The rate of creep for materials 1 and 2 was approximately the same, but the deformation mechanisms were different. The lowest creep rate was obtained for material 4. It has been shown that in the presence of second phase inclusions, despite the small grain size, a significant contribution to the material deformation comes from the motion of dislocations, especially in the case of material 2 with incoherent particles. The understanding of the deformation processes developed using model polycrystals can be used for elucidating the precipitation hardening mechanisms of alloys and the structure evolution of such materials during plastic deformation.

show abstract

Computer simulation of the effect of ultrasound and annealing on the structure of a two-dimensional severely deformed nanocrystalline material

Cited by 25 publications

References 11 publications

Two-dimensional model of the ordered alloy for the investigation of martensitic transformations

Two-dimensional model of the ordered alloy for the investigation of martensitic transformations

Softening and hardening of ECAP nickel under ultrasonic treatment

Simulation of the effect of strengthening-phase particles on the plastic deformation of a two-dimensional polycrystal

Contact Info

Product

Resources

About