Researches on a novel severe plastic deformation method combining direct extrusion and shearings for AZ61 magnesium alloy based on numerical simulation and experiments

2017 ◽  
Vol 23 (3) ◽  
pp. 582-590 ◽  
Author(s):  
Hongjun Hu ◽  
Zhao Sun ◽  
zhongwen Ou ◽  
xiaoqing Wang
Keyword(s):  
Numerical Simulation ◽  
Plastic Deformation ◽  
Magnesium Alloy ◽  
Severe Plastic Deformation ◽  
Deformation Method ◽  
Direct Extrusion ◽  
Az61 Magnesium Alloy

MICROSTRUCTURAL EVOLUTION OF AZ31 MAGNESIUM ALLOY PROCESSED BY A NEW NOBLE SEVERE PLASTIC DEFORMATION METHOD

2012 ◽  
Vol 05 ◽  
pp. 316-324
Author(s):  
S.M. FATEMI-VARZANEH ◽  
A. ZAREI-HANZAKI ◽  
R. VAGHAR
Keyword(s):  
Plastic Deformation ◽  
Magnesium Alloy ◽  
Severe Plastic Deformation ◽  
Shear Banding ◽  
Second Step ◽  
Deformation Method ◽  
Homogeneous Microstructure ◽  
Fine Grain ◽  
Nucleation Sites ◽  
Number Of Passes

A new noble severe plastic deformation method, called accumulative back extrusion (ABE), was developed to assist generating ultra fine grain materials. In the present work the ABE process was successfully applied on AZ 31 magnesium alloy up to three passes without any danger of cracks. The results showed that a large shear deformation may introduce through step one, where extensive shear banding and twinning are present in the microstructure. As the second step proceeds via constrained compressive deformation, more deformation inhomogenieties, which may act as preferred nucleation sites for new grains, were introduced in the microstructure. By increasing the number of passes to 3, more homogeneous microstructure with no significant smaller grain size was formed. The strain induced twinning and strain localization, which were led to occurrence of dynamic recrystallization (DRX), were found to be the main reasons of grain refinement during ABE process.

scholarly journals A Novel Severe Plastic Deformation Method for Manufacturing Al/Mg bimetallic Tube

2021 ◽  
Author(s):  
Ye Tian ◽  
Hongjun Hu ◽  
Dingfei Zhang
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Three Dimensional ◽  
Element Model ◽  
Bonding Layer ◽  
Deformation Method ◽  
Bimetallic Tube ◽  
Direct Extrusion ◽  
Grain Distribution ◽  
Three Dimensional Finite Element

Abstract A new severe plastic deformation for manufacturing Al/Mg bimetallic tube called TES (Tube Extrusion Shearing) process, which combines direct extrusion with two step shearing, is developed to Al/Mg bimetallic tube. To explore the deformation mechanism for Al/Mg bimetallic tube during TES process, both experiments and numerical simulations have been carried out. The stroke loads during TES process of Al/Mg bimetallic tubes have been simulated by establishing three-dimensional finite element model. Experiments show that by use of TES process the microstructures can be refined to 50% of the original grain size and with more uniform grain distribution. TES process could improve hardness obviously by comparing which fabricated by direct extrusion. Numerical results indicate TES increases the cumulative strains effectively by direct extrusion and additional shearing. The micro-structures and mechanical properties of the bonded layer were analyzed, The results showed that under the extrusion temperature of 420℃, the bonding layer of the sample obtained by extrusion shearing had no hole defects, and the thickness was about 22um, among which the stable layer was about 11um.The average hardness of the bonding layer is 221HV.

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