An experimental study on optimum lubrication for large-scale severe plastic deformation of aluminum-based alloys

2017 ◽  
Vol 239 ◽  
pp. 222-229 ◽  
Author(s):  
P. Frint ◽  
M.F.-X. Wagner ◽  
S. Weber ◽  
S. Seipp ◽  
S. Frint ◽  
...  
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Large Scale

scholarly journals Semi-Continuous Equal-Channel Angular Extrusion and Rolling of AA5083 and AZ31 Alloys

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1035 ◽  
Author(s):  
Vladimir Segal ◽  
Svetlana V. Reznikov ◽  
Nagendra Murching ◽  
Vincent H. Hammond ◽  
Laszlo J. Kecskes
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Large Scale ◽  
Equal Channel Angular Extrusion ◽  
Solution Treatment ◽  
Structure And Properties ◽  
Structural Refinement ◽  
Angular Extrusion ◽  
Lightweight Alloys ◽  
Technical Basis

This paper describes a new modification of equal-channel angular extrusion for the “pass-by-pass” semi-continuous (sc-ECAE) processing of lightweight alloys. Sc-ECAE leads to a multifold increase in productivity and decrease in costs, providing a technical basis for the commercialization of severe plastic deformation (SPD) on a large scale with massive volume production. The evolution of the structure and properties are analyzed for an aluminum alloy (AA) 5083 and a magnesium alloy AZ31 as model materials representing, respectively, the structural refinement under severe plastic deformation (SPD) via strain-induced formation of new grain boundaries and via dynamic recrystallization. For the first alloy, the microstructure after sc-ECAE is formed via ultrafine sub-grains, which are further transformed into sub-micrometer grains during post-ECAE rolling. The preliminary solution treatment of AA5083 is an important stabilizing factor for the achievement of high mechanical properties. For the second alloy, optimized sc-ECAE results in a remarkable structural refinement, and a good balance of properties is obtained with a low number of passes. However, additional rolling in the latter case leads to a degradation of the structure and properties.

Grain Refinement of Magnesium Alloys by CONFORM: A Continuous Severe Plastic Deformation Route?

2012 ◽  
Vol 706-709 ◽  
pp. 1781-1786 ◽  
Author(s):  
You Liang He ◽  
Fei Gao ◽  
Bao Yun Song ◽  
Rong Fu ◽  
Gui Ming Wu ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Large Scale ◽  
Tensile Tests ◽  
Mg Alloys ◽  
Uniaxial Tensile ◽  
Batch Mode ◽  
Angular Pressing ◽  
Conform Process

Effective grain refinement through equal channel angular pressing (ECAP) for magnesium (Mg) alloys has been demonstrated by many researchers. Although with the capability to achieve superplasticity, the batch mode nature of this method and the required repetitive processing to attain ultrafine grained structure have prohibited it from being widely used in large-scale industrial production. In this study, a well-established metal forming method – the continuous extrusion forming (CONFORM) process – was employed as a severe plastic deformation route to refine the microstructure of Mg alloys. Cast Mg-3%Al-1%Zn (AZ31) rods were used as the feedstock and the cast structure (grain size of ~150 microns) was refined to ~1 micron afteronepass CONFORM extrusion. Uniaxial tensile tests of the as-extruded samples were conducted at a temperature of 473K and an elongation of ~200% was achieved under a strain rate of 1×10-4s-1. The significant grain refinement effect was attributed to the severe shear deformation occurred during the CONFORM process, which is very similar to ECAP but with even higher effective strains. The most important advantage of CONFORM over ECAP is that the former is a continuous route, so it is able to produce long products. It was also shown that CONFORM could be an additional forming method for Mg alloys to conventional rolling, forging and extrusion.

Experimental study on pure copper subjected to different severe plastic deformation modes

2016 ◽  
Vol 656 ◽  
pp. 142-150 ◽  
Author(s):  
Jinghui Li ◽  
Fuguo Li ◽  
Chen Zhao ◽  
Han Chen ◽  
Xinkai Ma ◽  
...  
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Pure Copper ◽  
Deformation Modes

scholarly journals Experimental and Molecular Dynamic Study of Grain Refinement and Dislocation Substructure Evolution in HSLA and IF Steels after Severe Plastic Deformation

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1122
Author(s):  
Krzysztof Muszka ◽  
Dawid Zych ◽  
Paulina Lisiecka-Graca ◽  
Lukasz Madej ◽  
Janusz Majta
Keyword(s):  
New York ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Molecular Dynamic ◽  
Large Scale ◽  
Electron Backscatter Diffraction ◽  
Dislocation Substructure ◽  
Numerical Models ◽  
Microalloyed Steels ◽  
Dynamic Simulations

In this study, large-scale molecular dynamic simulations were performed to analyze the dislocation substructure interaction with various types of obstacles present in microalloyed steels during severe plastic deformation. Specifically, fully functional numerical models of the atomic upsetting test were developed, with particular emphasis on the presence of precipitates inside the microstructure grains. The obtained results compared with the microstructural tests, performed using Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscope (TEM) techniques, allowed for a more accurate assessment of the microstructure refinement mechanisms by means of the in-situ recrystallization effect in the deformed samples subjected to the multi-axis compression using the MaxStrain system (Dynamic Systems Inc., New York, NY, USA).

Part II. Friction of non-metals - Friction of diamond, graphite and carbon: the influence of adsorbed films

1952 ◽  
Vol 212 (1111) ◽  
pp. 485-488 ◽  
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Shear Strength ◽  
Large Scale ◽  
Physical Adsorption ◽  
Surface Films ◽  
Diamond Surfaces ◽  
Adsorbed Films ◽  
Carbon And Graphite ◽  
Frictional Behaviour

An experimental study has been made of the frictional behaviour of diamond, graphite and carbon which have been outgassed in vacuo . With carbon and graphite the friction rises to a high value when the surface films normally present are removed by outgassing. A small pressure of oxygen or water vapour restores the friction to its normal value. These results may be compared with Savage’s observations on the wear of graphite. This change is reversible on pumping out without heating, suggesting that a major factor is the physical adsorption of surface films. The friction of diamond surfaces in air is low, but on removing the surface films in vacuo it rises to a high value and the shear strength of the junction is comparable with the bulk strength of diamond. Large-scale seizure does not occur as with outgassed metals, since the deformation in the region of contact is elastic and the area of contact remains small. If the diamond slides on a metal such as platinum so that plastic deformation is possible, the area of contact becomes large and the friction is correspondingly increased.

GENERATING SEVERE PLASTIC DEFORMATIONS THROUGH LAMINATION

2017 ◽  
Vol 31 (2) ◽  
pp. 35-40
Author(s):  
Elena Pop ◽  
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Aluminium Alloy ◽  
High Potential ◽  
Alloy Sample ◽  
Plastic Deformations ◽  
Ultrafine Grains ◽  
Advanced Applications

This paper presents a theoretical and experimental study of the possible occurrence of microstructure up to nanometric level through severe plastic deformations. An aluminium alloy sample was laminated, in the form of a band and it withstood 4 passes through cylinders. As a result, ultrafine grains were obtained and the hardness of the sample increased. By generating severe plastic deformation through lamination, materials with ultrafine grains can be obtained. These materials possess a high potential of coping with many advanced applications in nanomaterials.

Experimental Study on Severe Plastic Deformation of Ti by Novel Equal-Channel Angular Pressing

2012 ◽  
Vol 51 (1S) ◽  
pp. 01AK04
Author(s):  
Saifulnizan Jamian ◽  
Hisashi Sato ◽  
Eri Miura-Fujiwara ◽  
Yoshimi Watanabe
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Angular Pressing
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