scholarly journals Determination of the stress state and the specific force during severe plastic deformation in a closed die

2019 ◽  
Vol 17 (1) ◽  
pp. 82-85
Author(s):  
Violetta A. Andreyachshenko ◽  
Zhasulan A. Ashkeyev ◽  
Serikbol T. Abdiramanov
Keyword(s):  
Plastic Deformation ◽  
Stress State ◽  
Severe Plastic Deformation ◽  
Slip Line ◽  
Specific Force ◽  
Flat Punch ◽  
Line Method ◽  
Ultrafine Grained ◽  
3D Software ◽  
Deform 3D

This article describes the results of a study that looked at the stress state and the specific force or contact pressure through the application of the slip line method and computer simulation (i.e. using the Deform 3D software package) when a workpiece was subjected to severe plastic deformation (SPD) in a special closed die. SPD is achieved when a flat punch is embedded in a round workpiece enclosed in the die and alternately compressed by a ring-shaped punch. Analysis of the results shows that compressive stresses prevail in the deformation zone resulting in the production of blanks with ultrafine-grained and/or nanostructure, as well as high mechanical properties. The relative discrepancy between the results obtained through the slip line method and those obtained through modelling in Deform 3D was about 1.3% indicating that the results can be considered reliable. It should be noted that this closed-die technique can be used to produce such products as gears, i.e. heavy-duty parts.

Plastic Deformation Simulation on Compound Twist Extrusion Process for Metal Materials

2013 ◽  
Vol 291-294 ◽  
pp. 2676-2679 ◽  
Author(s):  
Yong Zhi Li ◽  
Xue Fei Du
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Effective Strain ◽  
Extrusion Process ◽  
Ultrafine Grained ◽  
Twist Extrusion ◽  
The Subject ◽  
Intensive Investigation ◽  
3D Software ◽  
Deform 3D

Severe plastic deformation（SPD）methods have been the subject of intensive investigation for preparing bulk ultrafine-grained materials in recent years. This paper introduces a new severe plastic deformation (SPD) process named as C-TE process which combines the Twist Extrusion with Extrusion against the asymmetric deformation of TE process. and the distribution of effective strain and stress of the sample and the variation of load with time and its influence on the deformation were investigated by computer simulation with Deform-3D software . The results reveal that C-TE process can significantly slow uniform phenomenon,and a sample of homogeneous deformation can be obtained by the improved process.

The New SPD Processing Trends to Fabricate Bulk Nanostructured Materials

2006 ◽  
Vol 114 ◽  
pp. 7-18 ◽  
Author(s):  
Ruslan Valiev
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Nanostructured Materials ◽  
Nanocrystalline Materials ◽  
Commercial Production ◽  
Materials Processing ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials ◽  
Bulk Nanocrystalline

During the last decade severe plastic deformation (SPD) has become a widely known method of materials processing used for fabrication of ultrafine-grained materials with attractive properties. Nowadays SPD processing is rapidly developing and is on the verge of a transition from lab-scale research to commercial production. This paper focuses on several new trends in the development of SPD techniques for effective grain refinement, including those for commercial alloys and presents new SPD processing routes to produce bulk nanocrystalline materials.

Investigations on Microstructure Evolution and Deformation Behavior of Aged and Ultrafine Grained Al-Zn-Mg Alloy Subjected to Severe Plastic Deformation

2010 ◽  
Vol 667-669 ◽  
pp. 253-258
Author(s):  
Wei Ping Hu ◽  
Si Yuan Zhang ◽  
Xiao Yu He ◽  
Zhen Yang Liu ◽  
Rolf Berghammer ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
Microstructure Evolution ◽  
Deformation Behavior ◽  
Deformation Mechanisms ◽  
Mg Alloy ◽  
Ultrafine Grained

An aged Al-5Zn-1.6Mg alloy with fine η' precipitates was grain refined to ~100 nm grain size by severe plastic deformation (SPD). Microstructure evolution during SPD and mechanical behaviour after SPD of the alloy were characterized by electron microscopy and tensile, compression as well as nanoindentation tests. The influence of η' precipitates on microstructure and mechanical properties of ultrafine grained Al-Zn-Mg alloy is discussed with respect to their effect on dislocation configurations and deformation mechanisms during processing of the alloy.

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.

Relaxation Processes in Ultrafine-Grained Copper Processed by Severe Plastic Deformation

1998 ◽  
Vol 156 ◽  
pp. 229-234
Author(s):  
N.M. Amirkhanov ◽  
Rinat K. Islamgaliev
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Relaxation Processes ◽  
Ultrafine Grained

Texture Development in a Model Al-Li Alloy Subjected to Severe Plastic Deformation

2006 ◽  
Vol 114 ◽  
pp. 337-344 ◽  
Author(s):  
Bogusława Adamczyk-Cieślak ◽  
Jaroslaw Mizera ◽  
Krzysztof Jan Kurzydlowski
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Extrusion ◽  
Orientation Distribution ◽  
X Ray Diffraction ◽  
Technological Parameters ◽  
Initial State ◽  
Texture Characteristic ◽  
X Ray ◽  
Ultrafine Grained

The texture of Al – 0.7 wt. % Li alloy processed by two different methods of severe plastic deformation (SPD) has been investigated by X-ray diffraction, and analyzed in terms of the orientation distribution function (ODF). It was found that severe plastic deformation by both Equal Channel Angular extrusion (ECAE) and Hydrostatic Extrusion (HE) resulted in an ultrafine grained structure in an Al – 0.7 wt. % Li alloy. The microstructure, grain shape and size, of materials produced by SPD strongly depend on the technological parameters and methods applied. The texture of the investigated alloy differed because of the different modes of deformation. In the initial state the alloy exhibited a very strong texture consisting of {111} fibre component. A similar fibrous texture characteristic was also found after HE whereas after the ECAE the initial texture was completely changed.

scholarly journals Aging Behaviour of Al-Mg-Si Alloys Subjected to Severe Plastic Deformation by ECAP and Cold Asymmetric Rolling

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
S. Farè ◽  
N. Lecis ◽  
M. Vedani
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Isothermal Aging ◽  
Room Temperature ◽  
Coarse Grained ◽  
Peak Shape ◽  
Asymmetric Rolling ◽  
Ultrafine Grained ◽  
Aging Kinetics ◽  
Reduced Intensity

A study was carried out on aging behaviour of a 6082 alloy processed by two different severe plastic deformation techniques: ECAP and asymmetric rolling. Both techniques were able to generate an ultrafine-grained structure in samples processed at room temperature. It was stated that severe straining promotes marked changes in the postdeformation aging kinetics. The peaks of β′′/β′ transition phases were anticipated and of progressively reduced intensity over the coarse grained alloy. A further peak accounting for onset of recrystallization also appeared in the most severely deformed samples. Full consistency in peak shape and position was found when comparing materials processed by ECAP and asymmetric rolling. Isothermal aging treatments performed at 180°C revealed that in the severely deformed samples, aging became so fast that the hardness curves continuously decreased due to overwhelming effects of structure restoration. On the contrary, aging at 130°C offers good opportunities for fully exploiting the precipitate hardening effects in the ultrafine-grained alloy.

Effect of Processing Route on Microstructure and Mechanical Behaviour of Ultrafine Grained Metals Processed by Severe Plastic Deformation

2005 ◽  
Vol 482 ◽  
pp. 83-88 ◽  
Author(s):  
Vàclav Sklenička ◽  
Jiří Dvořák ◽  
Milan Svoboda ◽  
Petr Král ◽  
B. Vlach
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Mechanical Behavior ◽  
Mechanical Behaviour ◽  
Melt Spinning ◽  
Processing Route ◽  
Ultrafine Grained ◽  
Water Atomization

Aluminum-based alloys containing quasicrystalline particles of 50 – 600 nm in diameter as a reinforcing phase were produced in the form of powder or ribbons by water atomization or melt spinning techniques, respectively. Rods were compacted from powders and some ribbons by severe plastic deformation without sintering. Structure and mechanical behavior of alloys are discussed.

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