Mechanical Behavior of Processed AZ91D by Equal Channel Angular Extrusion during Semi-Solid Isothermal Compression

2006 ◽  
Vol 116-117 ◽  
pp. 530-533 ◽  
Author(s):  
Ju Fu Jiang ◽  
Shou Jing Luo
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
Equal Channel Angular Extrusion ◽  
Peak Stress ◽  
True Stress ◽  
Sudden Increase ◽  
Isothermal Compression ◽  
Angular Extrusion ◽  
Semi Solid

Mechanical behavior of processed AZ91D magnesium alloy by equal channel angular extrusion during semi-solid isothermal compression was investigated using semi-solid isothermal compression test. The results show that there are four stages, drastic increase of true stress, drastic falling of true stress, steady stage and increase of true stress. With the increase of holding time or deformation temperature, required true stress for obtaining same true strain falls evidently and peak stress and steady stress also fall in true stress-strain curve. With increasing strain rate, steady stress also increase. Peak stress will increase or decrease with the sudden increase or fall of strain rate. During semi-solid isothermal compression, plastic deformation of semi-solid billet mainly depends on plastic deformation of solid phases and their rotation and sliding. Coarse grains occur in upper position adjacent to compression die’s surface and fine grains occur in the central and free surface positions of billets.

scholarly journals A New Method of Manufacturing Thin-Walled Tube Made of AZ61 Magnesium Alloy Including Direct Extrusion And Corrugated Equal Channel Angular Extrusion

2021 ◽  
Author(s):  
H-J Hu ◽  
Ou Zhang ◽  
Gang Hu ◽  
Hui Zhao ◽  
Zhongwen OU
Keyword(s):  
Plastic Deformation ◽  
Magnesium Alloy ◽  
Large Scale ◽  
Equal Channel Angular Extrusion ◽  
Process Conditions ◽  
Workpiece Material ◽  
Plastic Deformation Behavior ◽  
Angular Extrusion ◽  
Thin Walled Tube ◽  
Thin Walled

Abstract Due to demand of strong toughness of thin walled tube, and good secondary forming properties and high-precision dimension, New plastic forming method should be researched to achieve a complete filling, uniform deformation and microstructure evolution during forming process.To obtain the deformation mechanisms of a new composite extrusion for thin walled tube fabricated by tube corrugated equal channel angular extrusion has been researched which is shorten as “TC-ECAE” in this paper. Finite element DEFORMTM-3D software to investigate the plastic deformation behavior of magnesium billet during TC-ECAE process has been employed. Computed parameters including workpiece material characteristics and process conditions have been taken into consideration. The pridictions of strains distributions and damage distributions and effective stress distributions and flow velocities distributions and microstructures evolutions have been explored. The results proved that the TC-ECAE process is a forming method for magnesium alloy tube which is suitable for large scale industrial application. The TC-ECAE process would cause serve plastic deformation and improve the dynamic recrystallization of magnesium alloy during TC-ECAE process.

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.

Mechanical Aspects of Plastic Deformation of Nickel Based Superalloy

2013 ◽  
Vol 592-593 ◽  
pp. 724-727
Author(s):  
Andrzej Nowotnik ◽  
Paweł Rokicki ◽  
Paweł Pędrak ◽  
Slawomir Kotowski ◽  
Jan Sieniawski ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Flow Stress ◽  
Strain Rate ◽  
Deformation Process ◽  
True Strain ◽  
True Stress ◽  
Effect Of Temperature ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Nickel Based Superalloy

Variations of a true stress vs. true strain illustrate behaviour of materials during plastic deformation. Stress-strain relationship is generally evaluated by a torsion, compression and tensile tests. Results of these tests provide crucial information pertaining to the stress values which are necessary to run deformation process at specified temperature and cooling rate. Uniaxial compression tests at temperatures below the γ solvus were conducted on nickel based superalloy CMSX-4, to study the effect of temperature and strain rate on its flow stress. On the basis of received flow stress values activation energy of a high-temperature deformation process was estimated. Mathematical dependences (σpl -T i σpl - ἐ) and compression data were used to determine material constants. These constants allow to derive a formula that describes the relationship between strain rate, deformation temperature and true stress.

Models for severe plastic deformation by equal-channel angular extrusion

JOM ◽  
2004 ◽  
Vol 56 (10) ◽  
pp. 69-77 ◽  
Author(s):  
S. L. Semiatin ◽  
A. A. Salem ◽  
M. J. Saran
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Extrusion ◽  
Angular Extrusion

Evaluation of Reshaping Methods for Multi-Pass Equal Channel Angular Extrusion

2008 ◽  
Vol 584-586 ◽  
pp. 63-67
Author(s):  
D.C. Foley ◽  
R.E. Barber ◽  
J.T. Im ◽  
B. Onipede ◽  
K.T. Hartwig
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Deformation Process ◽  
Equal Channel Angular Extrusion ◽  
Processing Efficiency ◽  
Severe Plastic Deformation Process ◽  
Method Selection ◽  
Plastic Deformation Process ◽  
Angular Extrusion ◽  
Significant Step

Equal Channel Angular Extrusion is a widely adopted severe plastic deformation process capable of imparting large amounts of strain in a material via multiple passes through the die. In order to facilitate reinsertion of worked bars for multipass processing, reshaping is often required. Although this topic is rarely discussed in the literature, it is a significant step that can influence processing efficiency. This paper presents several reshaping options and makes recommendations for method selection based on the authors’ experiences with each.

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