scholarly journals INFLUENCE OF DIE ANGLES ON THE MICROHARDNESS OF ALUMINUM ALLOY PROCESSED BY EQUAL CHANNEL ANGULAR PRESSING

2010 ◽  
Vol 11 (2) ◽  
pp. 137-149
Author(s):  
Ali A Aljubouri
Keyword(s):  
Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Deformation Behavior ◽  
Sharp Angle ◽  
Die Geometry ◽  
Angular Pressing ◽  
Processed Material ◽  
Plastic Deformation Behavior ◽  
Produce Strain ◽  
Pass Through

 The die geometry has a massive effect on the plastic deformation behavior during pressing of material processed by equal channel angular pressing (ECAP) method; subsequently the properties of the processed material are strongly dependent on it. Two categories of designed and manufactured dies are used for equal channel angular pressing, a 1200 sharp angle and a 900 round –cornered (200) dies, that produce strain per pass through both dies of ~0.7 and ~1.05   respectively. The microhardness developed in Al-Si alloy during ECAP using route BC. The microhardness increased by a factor of >1.5, after only 1 pressing. Subsequently, the hardness increases slightly up to 8 pressings through the 1200 sharp angle die, while it is increased by a factor of ~2.6 after 5 passes by using the 900 round cornered die, comparing with that for the cast workpiece.

Study of the Titanium Alloy Deformation Behavior in Equal Channel Angular Extrusion

2007 ◽  
Vol 345-346 ◽  
pp. 177-180 ◽  
Author(s):  
Dyi Cheng Chen ◽  
Yi Ju Li ◽  
Gow Yi Tzou
Keyword(s):  
Plastic Deformation ◽  
Titanium Alloy ◽  
Deformation Behavior ◽  
Equal Channel Angular Extrusion ◽  
Effective Strain ◽  
Processing Conditions ◽  
Rigid Plastic ◽  
Die Geometry ◽  
Extrusion Processing ◽  
Plastic Deformation Behavior

The shear plastic deformation behavior of a material during equal channel angular (ECA) extrusion is governed primarily by the die geometry, the material properties, and the processing conditions. Using commercial DEFORMTM 2D rigid-plastic finite element code, this study investigates the plastic deformation behavior of Ti-6Al-4V titanium alloy during 1- and 2-turn ECA extrusion processing in dies containing right-angle turns. The simulations investigate the distributions of the billet mesh, effective stress and effective strain under various processing conditions. The respective influences of the channel curvatures in the inner and outer regions of the channel corner are systematically examined. The numerical results provide valuable insights into the shear plastic deformation behavior of Ti-6Al-4V titanium alloy during ECA extrusion.

An Investigation into Optimized Ti-6Al-4V Titanium Alloy Equal Channel Angular Extrusion Process

2013 ◽  
Vol 479-480 ◽  
pp. 181-186 ◽  
Author(s):  
Dyi Cheng Chen ◽  
Yi Ju Li ◽  
Gow Yi Tzou
Keyword(s):  
Plastic Deformation ◽  
Titanium Alloy ◽  
Deformation Behavior ◽  
Equal Channel Angular Extrusion ◽  
Extrusion Process ◽  
Process Conditions ◽  
Rigid Plastic ◽  
Die Geometry ◽  
Plastic Deformation Behavior ◽  
Internal Angle

The shear plastic deformation behavior of a material during equal channel angular (ECA) extrusion is governed primarily by the die geometry, the material properties, and the process conditions. This paper employs the rigid-plastic finite element (FE) to investigate the plastic deformation behavior of Ti-6Al-4V titanium alloy during ECA extrusion processing. Under various ECA extrusion conditions, the FE analysis investigates the damage factor distribution, the effective stress-strain distribution, and the die load at the exit. The relative influences of the internal angle between the two die channels, the friction factors, the titanium alloy temperature and the strain rate of billet are systematically examined. In addition, the Taguchi method is employed to optimize the ECA process parameters. The simulation results confirm the effectiveness of this robust design methodology in optimizing the ECA processing of the current Ti-6Al-4V titanium alloy.

Factors Influencing Ductility in Ultrafine-Grained Metals Processed by Equal-Channel Angular Pressing

2009 ◽  
Vol 633-634 ◽  
pp. 341-352 ◽  
Author(s):  
Roberto B. Figueiredo ◽  
Zhi Chao Duan ◽  
Megumi Kawasaki ◽  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Elevated Temperatures ◽  
Testing Temperature ◽  
Ambient Temperatures ◽  
Angular Pressing ◽  
Factors Influencing ◽  
Ultrafine Grained ◽  
Processed Material

The processing of bulk metals through the application of severe plastic deformation provides an opportunity for achieving exceptional grain refinement to the submicrometer or even the nanometer range. This paper examines the characteristics of metals processed by equal-channel angular pressing with special emphasis on the levels of ductility that may be attained. It is shown that the amount of ductility is dependent not only upon the composition of the material but also, and to a major extent, upon the testing temperature. Specifically, the ductilities are often low at ambient temperatures where the strength of the as-processed material is relatively high but, by contrast, exceptionally high superplastic ductilities may be achieved over short ranges of strain rate when testing at elevated temperatures.

Research on Cu-Cr Alloy Produced by Equal Channel Angular Pressing

2013 ◽  
Vol 455 ◽  
pp. 131-136
Author(s):  
Xiu Qing Zhang ◽  
Ge Chen ◽  
Xiao Na Chen
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Copper Alloy ◽  
Room Temperature ◽  
Metallographic Analysis ◽  
Micro Hardness ◽  
Angular Pressing ◽  
Sem And Tem ◽  
Processed Material

Cu-7.5wt%Cr alloy was subjected to severe plastic deformation at room temperature using the procedure of equal channel angular pressing. Microstructures of the processed material were investigated by metallographic analysis, SEM and TEM. The results show that grains size of the processed materials was obviously fined. Cr precipitated in matrix was distributed uniformly. And micro-hardness of the copper alloy increased a lot.

A Study on the Aluminum Alloy AA1050 Severely Deformed by Non-Equal Channel Angular Pressing

2013 ◽  
Vol 651 ◽  
pp. 442-447 ◽  
Author(s):  
G.Y. Deng ◽  
C. Lu ◽  
L.H. Su ◽  
J.T. Li ◽  
H.T. Zhu ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Equal Channel Angular Pressing ◽  
Deformation Behavior ◽  
Dead Zone ◽  
Equivalent Plastic Strain ◽  
Exit Channel ◽  
Outer Corner ◽  
Angular Pressing

In order to improve the efficiency of grain refinement, a study on the modified process (called Non-equal channel angular pressing) from the conventional equal channel angular pressing has been conducted. The deformation behavior of aluminum alloy AA1050 deformed by the Non-equal channel angular pressing which has a smaller width in the exit channel than the entry channel was examined based on the finite element simulations. The results revealed that a smaller ratio of dE and dI (dE/dI) leads to a larger equivalent plastic strain. It is not only beneficial to enhance the plastic deformation but also very helpful to get rid of the development of dead zone in the outer corner of die by decreasing the exit channel width by comparing with the conventional process.

Three Dimensional Numerical Investigation of Equal Channel Multi-Angular Pressing

2006 ◽  
Vol 503-504 ◽  
pp. 931-936
Author(s):  
Quang Pham ◽  
Seung Chae Yoon ◽  
Sun Ig Hong ◽  
Hyoung Seop Kim
Keyword(s):  
Plastic Deformation ◽  
Deformation Behavior ◽  
Effective Strain ◽  
Three Dimensional ◽  
Workpiece Material ◽  
Angular Pressing ◽  
Commercial Code ◽  
Plastic Deformation Behavior ◽  
Central Regions ◽  
Global Deformation

Plastic deformation behavior during equal channel multi-angular pressing (ECMAP) was analyzed using the three dimensional finite volume method of the commercial code MSC.Superforge. In order to understand local and global deformation characteristics, effective strain and pressing load histories were investigated. The predicted plastic deformation behavior of the workpiece material during ECMAP of route A, route B and route C with a theoretical total strain of ~2.2 upon a single pass at three different friction factors (m=0, 0.1 and 0.2) was compared. The predicted strain results show different values in outside and similar values in central regions of the processed workpieces with different friction and forming routes. The pressing loads are higher under higher friction condition, showing almost no difference with three different pressing routes.

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