scholarly journals Effect of SFE on the evolution of crystallographic texture in Cu-Zn alloys subjected to severe plastic deformation

2021 ◽  
Vol 2103 (1) ◽  
pp. 012099
Author(s):  
L I Zaynullina ◽  
V D Sitdikov ◽  
G F Sitdikova ◽  
I V Alexandrov
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Computer Modeling ◽  
Crystallographic Texture ◽  
Copper Alloys ◽  
Experimental Investigations ◽  
Slip Systems ◽  
Angular Pressing ◽  
Self Consistent ◽  
Zn Alloys

Abstract Within the framework of experimental investigations and computer modeling using the viscoplastic self-consistent (VPSC) model of a material plastic flow, the regularities of preferential orientations formation were established, the proportion of certain texture components was estimated, and existing slip systems (SS) and twinning systems (TS) were identified for equal-channel angular pressing (ECAP) of copper alloys depending on the stacking fault energy (SFE).

scholarly journals Microstructure and crystallographic texture of Cu-Zn alloys subjected to ECAP and flat rolling

2021 ◽  
Vol 2094 (2) ◽  
pp. 022039
Author(s):  
L I Zaynullina ◽  
I V Alexandrov
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Crystallographic Texture ◽  
Structural Elements ◽  
Deformation Degree ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Flat Rolling ◽  
Stacking Fault Energies ◽  
Zn Alloys

Abstract This paper presents the results of the microstructure and crystallographic texture investigations of the Cu-Zn alloys system with different stacking fault energies (SFE) subjected to severe plastic deformation (SPD) by equal channel angular pressing (ECAP) and subsequent flat rolling. It is shown that ECAP leads to the formation of an ultrafine-grained (UFG) structure. Further flat rolling is accompanied by a decrease in the size of structural elements and the formation of nanoscale twins, which are more likely to be detected in an alloy with a lower SFE. As the deformation degree increases, the main crystallographic textures components of the investigated alloys become Brass and Goss components.

Crystallographic Texture Development in CP Ti Subjected to ECAP

2008 ◽  
Vol 584-586 ◽  
pp. 765-770 ◽  
Author(s):  
Igor V. Alexandrov ◽  
Vil D. Sitdikov
Keyword(s):  
Computer Modeling ◽  
Experimental Research ◽  
Crystallographic Texture ◽  
Texture Development ◽  
Prismatic Slip ◽  
Slip Systems ◽  
Active Deformation ◽  
Ecap Pass ◽  
Angular Pressing ◽  
Cp Ti

In this article we present the results of the experimental research and those of the processes developing the crystallographic texture of computer modeling in CP Ti in the process of 1-4 equal channel angular pressing (ECAP) passes along the route ВС. The goal of the research was to determine the active deformation mechanisms, depending on the strain degree, accumulated in the ECAP process. The research was carried out by the method of X-ray analysis and by computer modeling. Computer modeling was carried out on the example of visco-plastic self-consistent model. Thereby, the basal, the prismatic and the pyramidal (of the 1st and of the 2nd order) slip systems were considered as possible active slip systems. Besides, the possibility of activating the tensile and the compressive twinning systems were taken into consideration. As the result of the carried out experimental research, the objective laws of forming preferred orientations were determined. For the first time, with the help of computer modeling, made up to the 4th ECAP pass, it was shown that the crystallographic texture development processes in CP Ti in ECAP, realized at temperature of 723 K, can be explained by activation of the basal, prismatic and pyramidal (of the 1st order) slip systems and compressive twinning systems. Therefore, the increase of the ECAP passes can lead to amplification of contribution of the basal and prismatic slip systems, as well as the insignificant weakening of the contribution of pyramidal slip systems (of the 1st order). Moreover, the compressive twinning can become obvious only in the 1st ECAP pass.

Texture Formation during Severe Plastic Deformation

2005 ◽  
Vol 495-497 ◽  
pp. 785-790 ◽  
Author(s):  
Igor V. Alexandrov ◽  
M.V. Zhilina ◽  
A.V. Scherbakov ◽  
Alexander Korshunov ◽  
P.N. Nizovtsev ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Material Flow ◽  
3D Model ◽  
Texture Evolution ◽  
Pure Copper ◽  
Texture Formation ◽  
Taylor Model ◽  
Angular Pressing ◽  
Self Consistent

The paper represents results of computer modeling of texture formation in pure copper subjected to severe plastic deformation (SPD) realized by equal channel angular pressing (ECAP). Several polycrystalline models, namely the Taylor model, Sachs model, and self-consistent viscous plastic (VPSC) model, were applied and their predictions of texture evolution for different routes and number of ECAP passes were compared. For these calculations, simple shear deformation was used for the deformation realized by ECAP. Using the VPSC model, a single ECAP pass was revisited, but employing a 3D model of material flow, conducted by the variation-difference method, for the ECAP deformation. The influence of the inner and outer radii at the channel intersection and the friction coefficient on the homogeneity of the texture development in the cross section of the bulk ingot was investigated.

Experimental Investigations of the Al 6082 Alloy Subjected to Equal-Channel Angular Pressing

2005 ◽  
Vol 473-474 ◽  
pp. 129-134
Author(s):  
György Krállics ◽  
Dmitry Malgyn ◽  
Arpad Fodor
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Relative Size ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Experimental Investigations ◽  
End Effects ◽  
Fine Grained ◽  
Angular Pressing ◽  
Element Simulation

The interest in bulk nanostructured materials (NSM), processed by methods of severe plastic deformation (SPD), is justified by their unique physical and mechanical properties. Equalchannel angular pressing (ECAP) is one of the methods of severe plastic deformation (SPD) that produces ultra fine-grained material. Due to the cyclic nature of the process, it is difficult to produce specimens with a high length to diameter ratio. Ratios of 6-7 have been reported in the literature to date. Longer specimens, however, are useful since the homogenous part is larger and the relative size of end effects is smaller. A new method was developed to obtain length to diameter ratios as high as 8-10. This new technique was developed using the multi-pass finite element simulation. The as-received alloy used in this study was the 6082 commercial Al-Mg-Si alloy. High strength and high ductility phenomenon that was found recently in materials after SPD were reached with the route C. The induced anisotropy of specimens after ECAP was monitored.

TECHNOLOGIES FOR MANUFACTURING NANOSTRUCTURED SURFACES

2020 ◽  
Author(s):  
Андрей Дмитриевич Бухтеев ◽  
Виктория Буянтуевна Бальжиева ◽  
Анна Романовна Тарасова ◽  
Фидан Гасанова ◽  
Светлана Викторовна Агасиева
Keyword(s):  
Plastic Deformation ◽  
Surface Modification ◽  
Severe Plastic Deformation ◽  
Pressing Pressure ◽  
Pressure Treatment ◽  
Structured Surfaces ◽  
Nanostructured Surfaces ◽  
Angular Pressing ◽  
Multilayer Composites ◽  
Compaction Of Powders

В данной статье рассматривается применение и технологии получения наноструктурированных поверхностей. Рассмотрены такие методы как компактирование порошков (изостатическое прессование, метод Гляйтера), интенсивная пластическая деформация (угловое кручение, равноканальное угловое прессование, обработка давлением многослойных композитов) и модификация поверхности (лазерная обработка, ионная бомбардировка). This article discusses the application and technology for obtaining nano-structured surfaces. Methods such as compaction of powders (isostatic pressing, Gleiter method), severe plastic deformation (angular torsion, equal-channel angular pressing, pressure treatment of multilayer composites) and surface modification (laser treatment, ion bombardment) are considered.

MULTI-SCALE FINITE ELEMENT SIMULATION OF SEVERE PLASTIC DEFORMATION

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1621-1626
Author(s):  
HYOUNG SEOP KIM
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Severe Plastic Deformation ◽  
Constitutive Model ◽  
Dislocation Cell ◽  
Ultrafine Grain ◽  
Angular Pressing ◽  
Element Simulation ◽  
Ultrafine Grain Size ◽  
Ultrafine Grained

The technique of severe plastic deformation (SPD) enables one to produce metals and alloys with an ultrafine grain size of about 100 nm and less. As the mechanical properties of such ultrafine grained materials are governed by the plastic deformation during the SPD process, the understanding of the stress and strain development in a workpiece is very important for optimizing the SPD process design and for microstructural control. The objectives of this work is to present a constitutive model based on the dislocation density and dislocation cell evolution for large plastic strains as applied to equal channel angular pressing (ECAP). This paper briefly introduces the constitutive model and presents the results obtained with this model for ECAP by the finite element method.

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