Improvement of high-cycle fatigue life in a 6061 Al alloy produced by equal channel angular pressing

2002 ◽  
Vol 337 (1-2) ◽  
pp. 39-44 ◽  
Author(s):  
C.S. Chung ◽  
J.K. Kim ◽  
H.K. Kim ◽  
W.J. Kim
Keyword(s):  
Fatigue Life ◽  
Equal Channel Angular Pressing ◽  
High Cycle Fatigue ◽  
Al Alloy ◽  
Cycle Fatigue ◽  
Angular Pressing ◽  
6061 Al Alloy

High cycle fatigue behavior of Al1070 alloy severely deformed by equal channel angular pressing process

2016 ◽  
Vol 232 (6) ◽  
pp. 514-519 ◽  
Author(s):  
Mohammad Bagher Limooei ◽  
Morteza Zandrahimi ◽  
Ramin Ebrahimi
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Equal Channel Angular Pressing ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Pure Aluminum ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Angular Pressing ◽  
Pressing Process

In the present work, equal channel angular pressing of commercial pure aluminum 1070 was performed up to 4 passes using route Bc. For equal channel angular pressing operation, a suitable die set was designed and manufactured. X-ray diffraction analysis was used to determine the microstructure of the equal channel angular pressing-ed material. The fracture surface morphology and microstructure after fatigue were investigated by scanning electron microscopy. Mechanical properties of the equal channel angular pressing-ed material were evaluated by hardness and tension tests. Also, cyclic deformation behavior of severe plastic deformation Al1070 has been studied and results show a significant variation in hardness, ultimate strength and fatigue properties in high cycle fatigue life. Coefficient of fatigue strength σ′f and Bridgman correction factor have been obtained by S-N curve and tension test specimens, respectively, and compared before and after equal channel angular pressing process. Also an useful relation has been derived between fatigue life ( Nf) and stress amplitude ( σa) in high cycle fatigue region. Results indicated that there was not clear relation between fatigue strength coefficient and true corrected fracture stress in this case.

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

Effect of Trace Impurities on High-Cycle Fatigue Damage of Ultrafine Grained Copper Processed by Equal Channel Angular Pressing

2008 ◽  
Vol 584-586 ◽  
pp. 809-814
Author(s):  
Masahiro Goto ◽  
N. Teshima ◽  
Seung Zeon Han ◽  
T. Yakushiji ◽  
Sang Shik Kim
Keyword(s):  
Equal Channel Angular Pressing ◽  
Fatigue Damage ◽  
High Cycle Fatigue ◽  
Surface Damage ◽  
Cycle Fatigue ◽  
Trace Impurities ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Two Samples ◽  
Formation Behavior

In order to study the effect of trace impurities on high-cycle fatigue damage of ultrafine grained (UFG) copper, fatigue tests were carried out for two samples: oxygen-free copper (OFC, 99.99 wt% Cu) and deoxidized low-phosphorous copper (DLP, 99.95 wt% Cu). After the processing by equal channel angular pressing (ECAP) using eight passes, equiaxed grains with an average size of 250 nm were formed for both the samples. Fatigue strength of UFG copper was enhanced by the impurities. The formation behavior of surface damage and the change in surface hardness was monitored. A close relationship was observed between the change in hardness and the formation behavior of surface damage. The physical background of the effect of trace impurities on the fatigue damage was discussed from the viewpoints of surface damage formation behavior.

Processing of High Purity Titanium by Equal Channel Angular Pressing at Cryogenic Temperature

2019 ◽  
Vol 960 ◽  
pp. 85-90 ◽  
Author(s):  
Hong Fei Wang ◽  
Si Tong Liu ◽  
Chun Yan Ban ◽  
Nan Nan Zhao ◽  
Yi Yao Kang ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
High Purity ◽  
Cryogenic Temperature ◽  
Shear Bands ◽  
Deformation Twinning ◽  
Al Alloy ◽  
Angular Pressing ◽  
Ram Speed ◽  
6061 Al Alloy ◽  
Purity Titanium

Experiments show that high purity titanium (HP-Ti) samples have been successfully processed by equal channel angular pressing (ECAP) using a 120 degree die and a relatively slow ram speed at cryogenic temperature when the HP-Ti rods were trapped with 6061 Al alloy tubes. Optical microscopy (OM) and transmission electron microscopy (TEM) were utilized to investigate the deformed microstructure of the material. Typical microstructures of shear bands and deformation twinning were found in the deformed microstructure of ECAPed HP-Ti. Furthermore, the SAED pattern analysis of the twinning structures revealed that the deformation twinning occurred on {112} planes. Keywords: High purity titanium; ECAP; TEM; Deformation twinning; Cryogenic temperature.

Effects of Equal Channel Angular Pressing and Heat Treatment on Low Cycle Fatigue Properties of 6005 Al Alloy

2008 ◽  
Vol 385-387 ◽  
pp. 721-724
Author(s):  
W.H. Kim ◽  
H.H. Cho ◽  
J.H. Cha ◽  
S.I. Kwun ◽  
Dong Hyuk Shin
Keyword(s):  
Heat Treatment ◽  
Equal Channel Angular Pressing ◽  
Low Cycle Fatigue ◽  
Cyclic Hardening ◽  
Cyclic Softening ◽  
Fatigue Properties ◽  
Al Alloy ◽  
Cycle Fatigue ◽  
Angular Pressing ◽  
Aging Conditions

The effects of equal channel angular pressing (ECAP) and subsequent heat treatment on the low cycle fatigue properties of 6005 Al alloy were investigated. The ECAPed specimens showed cyclic softening, whereas the peak aged specimens showed cyclic hardening at all strain amplitudes. After ECAP, artificial aging was performed at 175°C to observe the change of the low cycle fatigue properties due to precipitation. The fatigue life and behavior of the unECAPed and ECAPed 6005 Al alloys were discussed in terms of the microstructural changes and aging conditions.

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