Influence of outer corner angle (OCA) on the plastic deformation and texture evolution in equal channel angular pressing

2014 ◽  
Vol 81 ◽  
pp. 79-88 ◽  
Author(s):  
Guanyu Deng ◽  
Cheng Lu ◽  
Lihong Su ◽  
Anh Kiet Tieu ◽  
Jintao Li ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Texture Evolution ◽  
Corner Angle ◽  
Outer Corner ◽  
Angular Pressing

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.

The Influence of ECAP Geometry on the Effective Strain Distribution

2015 ◽  
Vol 1127 ◽  
pp. 135-141 ◽  
Author(s):  
Robert Kočiško ◽  
Tibor Kvačkaj ◽  
Andrea Kováčová ◽  
Michal Zemko
Keyword(s):  
Plastic Deformation ◽  
Transverse Direction ◽  
Effective Strain ◽  
Corner Angle ◽  
Average Value ◽  
Outer Corner ◽  
Angular Pressing ◽  
Strain Homogeneity ◽  
Deform Program ◽  
High Degree

Equal channel angular pressing (ECAP) is one of the most well-known severe plastic deformation (SPD) method for formation the UFG (ultrafine-grained) structures. This method provides very high strains leading to the extreme work hardening and microstructural refinement. To increase the efficiency of ECAP method, there is necessary to design the geometry of ECAP die with focus on high degree of plastic deformation homogeneity. The present study deals with the influence of channel angle on the deformation behavior and strain homogeneity in the transverse direction of sample after two ECAP passes. This analysis was carried out through finite element simulations in the Deform program. In the simulation, three main factors such as an intersecting angle of Ф = 90°, 100°, 110° a 120°, outer corner angle R (ψ) and inner corner angle (r) were being varied. The equation describing the dependence of R and r on average value of the effective plastic strain for different channel angles was established. Moreover, strain inhomogeneity index (Ci) in the transverse direction of sample was also calculated. The results from simulations have indicated that if the outer corner angle increases, mean effective strain decreases. After two ECAP passes (route C), there was seen the increase in strain homogeneity of the sample's cross section.

Estimation of Average Strain Rate during Equal-Channel Angular Pressing

2016 ◽  
Vol 850 ◽  
pp. 419-425 ◽  
Author(s):  
Fan Liu ◽  
Ying Liu ◽  
Jing Tao Wang
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
Present Model ◽  
Volume Flow Rate ◽  
Average Strain ◽  
Channel Angle ◽  
Corner Angle ◽  
Angular Pressing ◽  
Average Strain Rate

In plastic deformation, the strain rate is a crucial factor to influence the constitutive behavior of materials such as the flow stress evolution, dislocation slipping, and deformation heat generation. In the present work, a formula based on the volume flow rate rule in plastic deformation was proposed to estimate the average strain rate of materials during equal-channel angular pressing (ECAP). It has been found that both the deformation parameters (channel angle Φ, corner angle Ψ, channel width d, and pressing speed v) and material characteristics (strain hardening behavior) can influence the average strain rate during ECAP. The present model was compared with two other models for estimating the strain rate and numerical values calculated by four different finite element methods (FEM). The result of the present model is in good agreement with the numerical strain rate values by FEM at various values for channel angle Φ and corner angle Ψ.

Texture Evolution as Determined by In situ Neutron Diffraction During Annealing of Iron Deformed by Equal Channel Angular Pressing

2014 ◽  
Vol 45 (10) ◽  
pp. 4235-4246 ◽  
Author(s):  
H. R. Z. Sandim ◽  
R. E. Bolmaro ◽  
R. A. Renzetti ◽  
M. J. R. Sandim ◽  
K. T. Hartwig ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Equal Channel Angular Pressing ◽  
Texture Evolution ◽  
Angular Pressing ◽  
In Situ Neutron Diffraction

scholarly journals PERUBAHAN NILAI KEKERASAN DAN KONDUKTIVITAS LISTRIK ALUMINIUM AKIBAT PROSES EQUAL CHANNEL ANGULAR PRESSING (ECAP)

ROTASI ◽  
2014 ◽  
Vol 16 (4) ◽  
pp. 41
Author(s):  
Rusnaldy Rusnaldy ◽  
Norman Iskandar ◽  
Muhammad Khairul Rais ◽  
Wisnu Tri Erlangga
Keyword(s):  
Electrical Conductivity ◽  
Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Hardness Test ◽  
Hardness Measurement ◽  
Optical Microscope ◽  
Pure Aluminium ◽  
Angular Pressing ◽  
Ecap Process ◽  
Number Of Passes

In current study, Equal Channel Angular Pressing (ECAP) process was applied to pure aluminium rod. The effect of the number of passes on hardness and electrical conductivity ECAP samples was investigated. The dimensions of ECAP die for 12 mmm diameter workpieces are designed with intersect angle of 120o. The experiments were carried out by using samples cut from an ingot and a rod and machined to a size of 12 mm in diameter and 50 mm in length. The workpiece was pressed into the ECAP die up to 7 passes at room temperature.After deformation, all samples were subjected to a hardness test, an electrical conductivity test and for optical microscope study. The hardness measurement of the ECAP samples suggested that enhanced hardness would be obtained by repeating ECAP process.Increasing the electrical conductivity of the ECAP samples indicatesthat there is no dislocation formation due to increasing plastic deformation in ECAP process

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