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.

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

scholarly journals Influence of strain rate on deformation behaviour of an AX52 alloy processed by equal channel angular pressing (ECAP)

2018 ◽  
Vol 8 (4) ◽  
pp. 517-523 ◽  
Author(s):  
Z. Trojanová ◽  
K. Halmešová ◽  
J. Džugan ◽  
P. Palček ◽  
P. Minárik ◽  
...  
Keyword(s):  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
Deformation Behaviour ◽  
Angular Pressing

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.

Cavitation Behavior of Ultra-Fine Grained Ti-6Al-4V Alloy Produced by Equal-Channel Angular Pressing

2007 ◽  
Vol 551-552 ◽  
pp. 621-626
Author(s):  
Young Gun Ko ◽  
Yong Nam Kwon ◽  
Jung Hwan Lee ◽  
Dong Hyuk Shin ◽  
Chong Soo Lee
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
Cavity Growth ◽  
Rate Sensitivity ◽  
Theoretical Models ◽  
Coarse Grained ◽  
Fine Grained ◽  
Angular Pressing ◽  
Cavitation Behavior

Cavitation behavior during superplastic flow of ultra-fine grained (UFG) Ti-6Al-4V alloy was established with the variation of grain size and misorientation. After imposing an effective strainup to 8 via equal-channel angular pressing (ECAP) at 873 K, alpha-phase grains were markedly refined from 11 μm to ≈ 0.3 μm, and misorientation angle was increased. Uniaxial-tension tests were conducted for initial coarse grained (CG) and two UFG alloys (ε = 4 and 8) at temperature of 973 K and strain rate of 10-4 s-1. Quantitative measurements of cavitation evidenced that both the average size and the area fraction of cavities significantly decreased with decreasing grain size and/or increasing misorientation. It was also found that, when compared to CG alloy, cavitation as well as diffused necking was less prevalent in UFG alloys, which was presumably due to the higher value of strain-rate sensitivity. Based on the several theoretical models describing the cavity growth behavior, the cavity growth mechanism in UFG alloys was suggested.

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.

scholarly journals Strengthening of Materials by Equal Channel Angular Pressing Using ANSYS

2021 ◽  
pp. 255-265
Author(s):  
Cheran Manoharan ◽  
Dheeran Panneerselvam ◽  
Hajudeen Prem Nazeer ◽  
Kishorekanna Kalyanasundaram ◽  
Mr. R. Vijayaragavan
Keyword(s):  
Equal Channel Angular Pressing ◽  
Deformation Behaviour ◽  
Three Dimensional ◽  
Die Design ◽  
Fine Grained ◽  
Angular Pressing ◽  
Dimensional Finite Element ◽  
Aerospace Medical ◽  
Solid Works ◽  
Three Dimensional Finite Element

Equal channel angular pressing (ECAP) is one of the popular severe plastic deformation processes used to produce bulk nano structured materials. It is well known that large deformation results in microstructures with small grains and extensive dislocation cells development, often leading to corresponding increases in strength. In order to design an equal channel angular pressing (ECAP) die that can be used to process a variety of materials, it is crucial to understand the effect of die design and material parameters on the deformation behaviour, strain distribution and load requirement. In this analysis, the effect of internal die angle (Φ) and number of passes (N) on the strain behaviour of engineering materials and alloys, during ECAP was investigated by using three dimensional finite element analyses. The benefits of ECAE come from its ability to impose intense simple shear deformation through innovative die design. Unlike conventional extrusion processes, the cross section of billets extruded via ECAE is not reduced. Entire work will be carried out with the help of SOLID WORKS, ANSYS. These ultra-fine grained materials can be used in the manufacturing of semi-finished products used in the power, aerospace, medical and automotive industries.

Grain Refinement of Vanadium by Low Temperature Severe Plastic Deformation

2010 ◽  
Vol 638-642 ◽  
pp. 1934-1939 ◽  
Author(s):  
Y.B. Chun ◽  
S.H. Ahn ◽  
D.H. Shin ◽  
S.K. Hwang
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Low Temperature ◽  
Yield Strength ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Tensile Elongation ◽  
Lamellar Microstructure ◽  
Lamellar Thickness ◽  
Angular Pressing

Recent advances in the severe plastic deformation technique have shown that effective refinement of the microstructure can be achieved in pure metals as well as in alloys. Among the various methods of severe plastic deformation, equal channel angular pressing has been the subject of numerous research works. Since the grain refining effect of this technique appears to reach a peak at a level of approximately 200 nm further microstructural changes are sought—deformation at a cryogenic temperature being one of the candidate routes. In the present study, we opted to combine equal channel angular pressing and low temperature plastic deformation to refine the microstructure of commercially pure V. The starting microstructure consisted of equiaxed grains with an average size of 100 micrometers. This microstructure was refined to a 200 nm thick lamellar microstructure by 8 passes of equal channel angular pressing at 350°C. The lamellar thickness was further reduced to 140 nm upon subsequent cryogenic rolling, which resulted in room temperature yield strength of 768 MPa. In the specimens, recrystallization annealed at 850°C, the grain size reached 1000 nm or larger, and the yield strength obeyed the Hall-Petch relationship with that grain size. The tensile elongation value, which was low and insensitive to the grain size in the as-deformed state, increased significantly up to 43% with the recrystallization annealing.

Sign in / Sign up

Export Citation Format

Share Document