scholarly journals Effects of Temperature and Strain Rate on Plastic Deformation of Ultrafine-Grained Copper Prepared by Equal-Channel Angular Pressing

2014 ◽  
Vol 55 (10) ◽  
pp. 1525-1530 ◽  
Author(s):  
Satoshi Okubo ◽  
Hiroki Abe ◽  
Yoji Miyajima ◽  
Toshiyuki Fujii ◽  
Susumu Onaka ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Effects Of Temperature

Deformation Behaviour of an Ultra-Fine Grained Al6082 Alloy

2008 ◽  
Vol 584-586 ◽  
pp. 703-707 ◽  
Author(s):  
Ilchat Sabirov ◽  
Yuri Estrin ◽  
Matthew R. Barnett ◽  
Ilana B. Timokhina ◽  
Peter D. Hodgson
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
Deformation Behaviour ◽  
Tensile Elongation ◽  
Al Alloy ◽  
Fine Grained ◽  
Angular Pressing ◽  
Ultrafine Grained

This work focuses on the effect of strain rate on the deformation behaviour of an ultrafine grained Al alloy 6082 produced by equal channel angular pressing. The uniform tensile elongation was found to increase with decreasing strain rate very substantially. This effect is discussed in terms of the mechanisms that control plastic deformation of the alloy.

Extraordinary High Strain Rate Superplasticity of an Al-Mg-Sc-Zr Alloy Subjected to Equal Channel Angular Pressing

2012 ◽  
Vol 735 ◽  
pp. 295-300
Author(s):  
Elena Avtokratova ◽  
Oleg Sitdikov ◽  
Michael Markushev ◽  
Radik R. Mulyukov
Keyword(s):  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
High Strain ◽  
Strain Rate Range ◽  
Rate Range ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Excess Phases ◽  
Ultrafine Grained Microstructure ◽  
Zr Alloy

Unique superplastic elongations up to 4100% were achieved at 450°C in the strain rate range of 10-2-10-1s-1for Al-Mg-Sc-Zr alloy with a grain size ~1 μm processed by warm-to-hot equal channel angular pressing. Such a behavior is attributed to the synergy of complementary factors resulted in high homogeneity and stability of ultrafine-grained microstructure and superplastic flow, involving large proportion of high-angle grain boundaries, presence of dispersoids of aluminides of transition metals and negligible amount of coarse excess phases.

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.

Long-Length Ultrafine-Grained Titanium Rods Produced by ECAP-Conform

2008 ◽  
Vol 584-586 ◽  
pp. 80-85 ◽  
Author(s):  
Georgy I. Raab ◽  
Ruslan Valiev ◽  
Dmitriy Gunderov ◽  
Terry C. Lowe ◽  
Amit Misra ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Wire Drawing ◽  
Commercial Purity ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
A New Technique ◽  
First Time

A new technique of continuous severe plastic deformation (SPD)-processing, i.e. ECAP (equal channel angular pressing)-Conform is applied for the first time to produce long-length rods of commercial purity Ti with ultrafine-grained structure. The paper reports on the results of investigation of the microstructure and mechanical properties of Ti rods processed by ECAPConform and the following wire drawing.

Influence of Annealing on the Structure and Mechanical Properties of Ultrafine-Grained Alloy Ti-6Al-7Nb, Processed by Severe Plastic Deformation

2010 ◽  
Vol 667-669 ◽  
pp. 943-948 ◽  
Author(s):  
Veronika Polyakova ◽  
Irina P. Semenova ◽  
Ruslan Valiev
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Human Body ◽  
High Strength ◽  
Point Of View ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Strength And Ductility

This work is devoted to enhancement of strength and ductility of the Ti-6Al-7Nb ELI alloy, which is less harmful from medical point of view for human body in comparison to Ti-6Al-4V. It has been demonstrated that formation of an ultrafine-grained structure in the alloy with the help of equal-channel angular pressing in combination with heat and deformation treatments allows reaching high strength (UTS = 1400 MPa) and sufficient ductility (elongation 10 %).

Incremental Equal Channel Angular Pressing for Grain Refinement

2011 ◽  
Vol 674 ◽  
pp. 19-28 ◽  
Author(s):  
Andrzej Rosochowski ◽  
Lech Olejnik
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Angular Pressing ◽  
Process Implementation ◽  
University Of Technology ◽  
Element Simulation ◽  
Ultrafine Grained ◽  
Deformation Processes ◽  
The University

Creating a small amount of ultrafine grained metals by severe plastic deformation, for example using equal channel angular pressing, is possible in many research laboratories. However, industrial production of these materials is lagging behind because of the lack of industrially viable severe plastic deformation processes. One attempt to change this situation is based on the concept of incremental equal channel angular pressing developed by the University of Strathclyde and Warsaw University of Technology. The paper describes the path the researchers took to develop the process starting from finite element simulation, through tool design and process implementation, to material characterisation. Examples of various process configurations, which enable obtaining UFG bars, plates and sheets are given and possible future developments discussed.

Analytical and Numerical Modelling of Strain and Strain Rate in Equal Channel Angular Pressing (ECAP)

2006 ◽  
Vol 306-308 ◽  
pp. 965-970
Author(s):  
Hyoung Seop Kim
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
The Finite Element Method ◽  
Angular Pressing ◽  
Geometric Conditions ◽  
Strain And Strain Rate ◽  
Element Method

Equal channel angular pressing (ECAP) is a convenient forming procedure among various severe plastic deformation processes. It is based on extruding material through specially designed entry and exit channel dies to produce an ultrafine grained microstructure. The properties of the materials obtained depend on the plastic deformation behaviour during ECAP, which is governed mainly by the die geometry, the material itself and the processing conditions. As the mechanical properties of the severely deformed material are directly related to the deformation history, understanding the phenomena associated with strain and strain rate development in the ECAP process is very important. In this study, the results of continuum modelling of ECAP are described in order to understand strain and strain developments. For this purpose, the results of modelling ECAP using the finite element method and analytical solution are presented for various geometric conditions. It was concluded that although deformation is nonuniform due to geometric effects, the strain and strain rate values obtained by the analytical solutions are not much different from the average results of the finite element method.

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.

Equal Channel Angular Pressing in a Pearlitic Structured Steel

2007 ◽  
Vol 539-543 ◽  
pp. 4692-4697
Author(s):  
Jun Xia Huang ◽  
Jing Tao Wang
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Shear Deformation ◽  
Equal Channel Angular Pressing ◽  
Ferrite Matrix ◽  
Nucleation And Growth ◽  
Additional Energy ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Average Grain Size

Equal Channel Angular Pressing (ECAP) in a fully pearlitic structured steel 65Mn was successfully carried out at 923 K via route C in this study. The severe shear deformation of ECAP was accommodated by periodical bending, periodical shearing and shearing fracture etc in the pearlitic lamellae. The cementite in the pearlite has higher plastic deformation capability. Excessive imperfections may be introduced into the cementite, which supplies additional energy driving for the following spheroidization of cementite in subsequent processing. After five ECAP passes, the fully pearlitic lamellae evolved into a microstructure of ultrafine-grained ferrite matrix uniformly dispersed with finer cementite particles. The ferrite matrix is homogeneous with an average grain size of ~0.3 micrometers. Two possible mechanism for the spheroidization of cementite were proposed：heterogeneous growth of the fractured cementite fragments, and the precipitation of new fine spherical cementite particles through nucleation and growth.

Equal Channel Angular Pressing and Torsion (ECAPT) for Densification and Strengthening Properties of Powder Sintered Materials

2010 ◽  
Vol 146-147 ◽  
pp. 101-104 ◽  
Author(s):  
Yong Zhi Li ◽  
Xiao Bo Bai ◽  
Yu Min Xie ◽  
Ke Min Xie
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Full Density ◽  
Forming Process ◽  
Angular Pressing ◽  
Powder Sintering ◽  
Ultrafine Grained ◽  
Twist Extrusion ◽  
Sintered Materials

Severe Plastic Deformation（SPD）methods are hot research techniques of preparation of bulk ultrafine-grained materials and strengthening the material properties currently .Among the various SPD methods, ECAPT that a new method of ECAP （Equal channel angular pressing） organic integrates with TE（Twist extrusion）was key introduced for the frist time ,and experimental study on ECAPT technology for deformation and densification of pure Al and Mo powder sintered materials were carried out and the results were compared with that of ECAP in this paper.The results show that there have more effective and more stronger severe plastic deformation during the process of ECAPT and it improves the ability of material’s plastic deformation and strengthens the material properties.In forming process of ECAPT after three passes,the grain size of powder sintering reduces the average 200%, and there has its nearly full density and comprehensive performance materials to improve overall performance significantly.It is confirmed that there have better comprehensive mechanical properties of strengthening materials and more stronger severe plastic deformation during the process of ECAPT contrast to the ECAP, too.

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