Fracture locus characteristics of Al alloy 5083 processed by equal channel angular pressing using miniaturized specimens

2021 ◽  
pp. 161675
Author(s):  
Daniel Melzer ◽  
Ivan Smirnov ◽  
Ondřej Lukáš ◽  
Jaromír Dlouhý ◽  
Alexey Evstifeev ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Al Alloy ◽  
Fracture Locus ◽  
Angular Pressing

Enhancement of strength and superplasticity in a 6061 Al alloy processed by equal-channel-angular-pressing

2002 ◽  
Vol 33 (10) ◽  
pp. 3155-3164 ◽  
Author(s):  
W. J. Kim ◽  
J. K. Kim ◽  
T. Y. Park ◽  
S. I. Hong ◽  
D. I. Kim ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Al Alloy ◽  
Angular Pressing ◽  
6061 Al Alloy

Influence of stacking-fault energy on the accommodation of severe shear strain in Cu-Al alloys during equal-channel angular pressing

2009 ◽  
Vol 24 (12) ◽  
pp. 3636-3646 ◽  
Author(s):  
Xianghai An ◽  
Qingyun Lin ◽  
Shen Qu ◽  
Gang Yang ◽  
Shiding Wu ◽  
...  
Keyword(s):  
Shear Strain ◽  
Equal Channel Angular Pressing ◽  
Shear Bands ◽  
Al Alloys ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Dislocation Slip ◽  
Al Alloy ◽  
Angular Pressing ◽  
Inherent Deformation

X-ray diffraction (XRD) and transmission electron microscope (TEM) investigations have been carried out to decode the influence of stacking-fault energy (SFE) on the accommodation of large shear deformation in Cu-Al alloys subjected to one-pass equal-channel angular pressing. XRD results exhibit that the microstrain and density of dislocations initially increased with the reduction in the SFE, whereas they sharply decreased with a further decrease in SFE. By systematic TEM observations, we noticed that the accommodation mechanism of intense shear strain was gradually transformed from dislocation slip to deformation twin when SFE was lowered. Meanwhile, twin intersections and internal twins were also observed in the Cu-Al alloy with extremely low SFE. Due to the large external plastic deformation, microscale shear bands, as an inherent deformation mechanism, are increasingly significant to help carry the high local plasticity because low SFE facilitates the formation of shear bands.

Processing of eutectic Zn–5% Al alloy by equal-channel angular pressing

2004 ◽  
Vol 148 (3) ◽  
pp. 279-287 ◽  
Author(s):  
Gencaga Purcek ◽  
Burhanettin S. Altan ◽  
Ibrahim Miskioglu ◽  
Pey H. Ooi
Keyword(s):  
Equal Channel Angular Pressing ◽  
Al Alloy ◽  
Angular Pressing

Equal Channel Angular Pressing of Al Alloy AA2219

2009 ◽  
Vol 67 ◽  
pp. 53-58
Author(s):  
V. Anil Kumar ◽  
M.K. Karthikeyan ◽  
Rohit Kumar Gupta ◽  
P. Ramkumar ◽  
P.P. Sinha
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
High Strength ◽  
Dark Field ◽  
Grain Structure ◽  
Al Alloy ◽  
Angular Pressing

Severe plastic deformation processes (SPD) are gaining importance as advanced materials processing techniques and hold immense potential in obtaining ultra fine-grained high strength materials. Among the SPD techniques, Equal channel angular pressing (ECAP) has its own merits to produce materials with ultra fine grains in bulk with better mechanical properties. The material deforms with high level of plastic strain inside the channel resulting in grain refinement of the output material with improvement in mechanical properties. A very viable die configuration was conceptualized and die was made with 1200 channel angle. Processing of 25 mm dia. of Al alloy AA2219 at room temperature was successfully carried out and grain refinement was observed. The mechanism of grain refinement has been studied using optical and transmission electron microscopy (TEM). It was observed that low energy dislocation structure (LEDS) forms concurrently with sub-grain structure due to dislocation rearrangements, which provide stability to the evolving sub-grain structure. Dislocation mobility is hindered by the presence of precipitates and / or intermetallic dispersoids present in the matrix and results in presence of dislocations in grain interiors. The pile up of dislocations at intermetallic dispersoids was confirmed from the dark field TEM micrographs. Present paper describes the experimental procedure and followed to attain severe plastic deformation through ECAP. Increase in hardness as well as refinement in the grain size after 5-passes have been discussed in light of extensive optical and TEM. The mechanisms of grain refinement to achieve nano-grained structure and strengthening accrued from the grain refinement through ECAP has been discussed.

Effect of post equal-channel-angular-pressing aging on the modified 7075 Al alloy containing Sc

2008 ◽  
Vol 450 (1-2) ◽  
pp. 222-228 ◽  
Author(s):  
W.J. Kim ◽  
J.K. Kim ◽  
H.K. Kim ◽  
J.W. Park ◽  
Y.H. Jeong
Keyword(s):  
Equal Channel Angular Pressing ◽  
Al Alloy ◽  
Angular Pressing ◽  
7075 Al Alloy

Structural evolution of a strip-cast al alloy sheet processed by continuous equal-channel angular pressing

2002 ◽  
Vol 33 (3) ◽  
pp. 665-673 ◽  
Author(s):  
Jae-Chul Lee ◽  
Young-Hoon Chung ◽  
Hyun-Kwang Seok ◽  
Jin-Yoo Suh ◽  
Jun-Hyun Han
Keyword(s):  
Equal Channel Angular Pressing ◽  
Structural Evolution ◽  
Alloy Sheet ◽  
Al Alloy ◽  
Angular Pressing ◽  
Strip Cast
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