Some factors affecting the creep behaviour of metallic materials processed by equal-channel angular pressing

2009 ◽  
Vol 100 (6) ◽  
pp. 762-766 ◽  
Author(s):  
Václav Sklenička ◽  
Jiří Dvořák ◽  
Petr Král ◽  
Milan Svoboda ◽  
Ivan Saxl
Keyword(s):  
Equal Channel Angular Pressing ◽  
Creep Behaviour ◽  
Metallic Materials ◽  
Factors Affecting ◽  
Angular Pressing

Effect of Equal-Channel Angular Pressing (ECAP) on Creep in Aluminium Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 2904-2909 ◽  
Author(s):  
Vàclav Sklenička ◽  
Jiří Dvořák ◽  
Marie Kvapilová ◽  
Milan Svoboda ◽  
Petr Král ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Aluminium Alloys ◽  
Creep Resistance ◽  
Room Temperature ◽  
Creep Behaviour ◽  
Coarse Grained ◽  
Pure Aluminium ◽  
Creep Tests ◽  
Angular Pressing ◽  
Compression Creep

This paper examines the effect of equal-channel angular pressing (ECAP) on creep behaviour of pure aluminium, binary Al-0.2wt.%Sc alloy and ternary Al-3wt.%Mg-0.2wt.%Sc alloy. The ECAP was conducted at room temperature with a die that had a 90° angle between the channels and 8 repetitive ECAP passes followed route BC. Constant stress compression creep tests were performed at 473 K and stresses ranging between 16 to 80 MPa on ECAP materials and, for comparison purposes, on the initial coarse-grained materials. The results showed that the creep resistance of the ECAP processed Al-Sc and Al-Mg-Sc alloys was markedly deteriorated with respect to unpressed coarse-grained materials.

Grain Refinement of Aluminum using Equal-Channel Angular Pressing

1999 ◽  
Vol 601 ◽  
Author(s):  
Z. Horita ◽  
M. Furukawa ◽  
M. Nemoto ◽  
T.G. Langdon
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Processing Technique ◽  
Polycrystalline Materials ◽  
Factors Affecting ◽  
Angular Pressing ◽  
Development And Evolution

AbstractUsing the technique of equal-channel angular (ECA) pressing, it is possible to reduce the grain size of polycrystalline materials to the submicrometer level. Thus, this processing technique has the potential for producing materials which may exhibit superplasticity. This paper describes various factors affecting the development and evolution of the microstructure produced by ECA pressing. Optimization of such factors is then presented for the advent of superplasticity.

Grain Refinement of Copper Alloys by Equal Channel Angular Pressing

2004 ◽  
Vol 449-452 ◽  
pp. 177-180 ◽  
Author(s):  
Cha Yong Lim ◽  
Jae Hyuck Jung ◽  
Seung Zeon Han
Keyword(s):  
Grain Size ◽  
Equal Channel Angular Pressing ◽  
Copper Alloys ◽  
Metallic Materials ◽  
Fine Grained ◽  
Angular Pressing ◽  
Fine Grain ◽  
Transmission Electron ◽  
Ultrafine Grained ◽  
Average Grain Size

The equal channel angular pressing (ECAP) is one of the methods to refine the grain size of metallic materials. This study investigates the effect of ECAP process on the formation of the fine grain size in oxygen free Cu and Cu alloys. The average grain size has been refined from 150 µm before ECAP to 300 nm. Microstructure was analyzed by transmission electron micrography (TEM). The diffraction pattern of the selected area confirmed the formation of ultrafine-grained structure with high angle grain boundaries after 8 cycles of ECAP. Mechanical properties such as microhardness and tensile properties of the ultra-fine grained copper materials have been investigated.

Effect of Equal-Channel Angular Pressing on the Creep Resistance of Precipitation-Strengthened Alloys

2010 ◽  
Vol 667-669 ◽  
pp. 897-902 ◽  
Author(s):  
Vàclav Sklenička ◽  
Petr Král ◽  
Jiří Dvořák ◽  
Marie Kvapilová ◽  
Megumi Kawasaki ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Creep Resistance ◽  
Creep Behaviour ◽  
Intensive Research ◽  
Angular Pressing ◽  
Factors Influencing ◽  
Zr Alloys

Despite intensive research efforts in precipitation-strengthened alloys processed by equal-channel angular pressing (ECAP), so far only a few investigations have been conducted on their creep behaviour and the results from these studies are controversial. This paper examines these differences and evaluates some factors influencing the creep resistance of the binary Al-0.2%Sc and Cu-0.2% Zr alloys processed by ECAP.

Factors Affecting Grain Refinement in Equal-Channel Angular Pressing

2000 ◽  
Vol 331-337 ◽  
pp. 607-612 ◽  
Author(s):  
Daisuke Yamaguchi ◽  
Z. Horita ◽  
Takayoshi Fujinami ◽  
Minoru Nemoto ◽  
Terence G. Langdon
Keyword(s):  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Factors Affecting ◽  
Angular Pressing

Inhomogeneity of Microstructure and Creep of ECAP Aluminium

2006 ◽  
Vol 503-504 ◽  
pp. 245-250 ◽  
Author(s):  
Vàclav Sklenička ◽  
Petr Král ◽  
L. Ilucová ◽  
Ivan Saxl ◽  
Jiří Dvořák ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
High Purity ◽  
Creep Behaviour ◽  
Pure Aluminium ◽  
Mesoscopic Scale ◽  
Angular Pressing

High purity (99.99%) pure aluminium processed by equal channel angular pressing (ECAP) was examined in terms of the ECAP microstructure inhomogeneity and its creep behaviour. The results indicate that an inhomogeneity of the ECAP microstructure in mesoscopic scale may influence the creep behaviour of the pressed material.

Microstructure Stability and Creep Behaviour of a Cu-0.2wt.%Zr Alloy Processed by Equal-Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 821-826 ◽  
Author(s):  
Jiří Dvořák ◽  
Petr Král ◽  
Marie Kvapilová ◽  
Milan Svoboda ◽  
Vàclav Sklenička
Keyword(s):  
Electron Microscopy ◽  
Equal Channel Angular Pressing ◽  
Creep Behaviour ◽  
Tensile Creep ◽  
Creep Tests ◽  
Creep Properties ◽  
Angular Pressing ◽  
Microstructure Stability ◽  
Transmission Electron ◽  
Zr Alloy

A dispersion-strengthened Cu-0.2 wt.% Zr alloy was subjected to equal-channel angular pressing (ECAP) at room temperature for up to 12 passes through route BC using a die having a channel angle of 90°. The microstructural investigations were performed using both transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Tensile creep tests were conducted at temperature 673 K and at the applied stress in the range from 80 to 180 MPa. The migration of boundaries and subsequent grain growth were restricted by Cu9Zr2 precipitates. The study was performed in order to evaluate the effects of severe plastic deformation and precipitation on creep behaviour and microstructure of the pressed alloy. It was found that creep behaviour is strongly dependent on number of ECAP passes. The pressed alloy after up to 4 ECAP passes exhibited a considerable improvement in creep properties in comparison with the unpressed alloy.

A Simulation and Study on Strain Uniformity of Equal Channel Angular Pressing

2007 ◽  
Author(s):  
Xiaojing Xu ◽  
Jinqi Cao
Keyword(s):  
Nanostructured Materials ◽  
Equal Channel Angular Pressing ◽  
Processing Condition ◽  
Ecap Processing ◽  
Factors Affecting ◽  
Channel Angle ◽  
Fine Grained ◽  
Finite Element Software ◽  
Angular Pressing ◽  
Good Strain

The preparation of dense bulk nanostructured materials is becoming an important research subject with the development of nanostructured materials. Equal Channel Angular Pressing (ECAP) is thought to be one of the major technologies to prepare bulk nanostructured or ultra-fine grained metals, which can improve the mechanical property of materials considerably, but its processing effect was affected by many factors, such as press route, angle of channels, etc. Since some questions in the procedure of ECAP were not understood clearly, the researchers have different judgments on these factors affecting the result of ECAP processing. There were few reports about the processing condition that affect the strain uniformity, most of which deal with only 1 and 2 passes of ECAP. In present paper, a model dealing with four connective channels which can implement the continuous 4 passes ECAP processing was established firstly, the finite element software, DEFORM-3D, was used to simulate the processing of ECAP to study how the processing condition (press route and structure of die such as the channel angle and inner-arc radius) to affect the strain uniformity. Results show that the influence of press route is associated with pressing passes. In term of 4 passes pressing, route Bc has a most uniform distribution of strain, while in term of 2 passes pressing, route C can get a good strain uniformity. In addition, with the increase of channel angle and inner-arc radius, the strain uniformity was also improved considerably. So to get the best strain uniformity all the above factors should be taken into consideration.

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