Effects of dislocation slip mode on high-cycle fatigue behaviors of ultrafine-grained Cu–Zn alloy processed by equal-channel angular pressing

2013 ◽  
Vol 68 (6) ◽  
pp. 389-392 ◽  
Author(s):  
Z.J. Zhang ◽  
X.H. An ◽  
P. Zhang ◽  
M.X. Yang ◽  
G. Yang ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
High Cycle Fatigue ◽  
Dislocation Slip ◽  
Slip Mode ◽  
Cycle Fatigue ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Zn 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.

Effect of Equal Channel Angular Pressing and Annealing on Corrosion Resistance of Cu-Zn Alloy

2013 ◽  
Vol 706-708 ◽  
pp. 78-81 ◽  
Author(s):  
D.R. Fang ◽  
F.F. Liu ◽  
Chun Liu
Keyword(s):  
Corrosion Resistance ◽  
Low Temperature ◽  
Equal Channel Angular Pressing ◽  
Annealing Treatment ◽  
Coarse Grained ◽  
Nacl Solution ◽  
Angular Pressing ◽  
Low Temperature Annealing ◽  
Ultrafine Grained ◽  
Zn Alloy

Cu-32wt.%Zn alloy was subjected to equal channel angular pressing (ECAP) and subsequent low temperature annealing treatment, and the corrosion resistance of the samples was investigated by potentiodynamic polarization measurements in 3.5% NaCl solution. The results show that the corrosion rate of the ultrafine-grained alloy decreases, in comparison with the coarse-grained alloy. Meanwhile, it is noted that the corrosion resistance of the sample subjected to ECAP can be further improved by relief annealing.

Texture, Microstructure, and Ductility of Mg-Al-Zn Alloy after Equal Channel Angular Pressing

2009 ◽  
Vol 633-634 ◽  
pp. 365-372
Author(s):  
Vladimir Serebryany ◽  
Sergey V. Dobatkin ◽  
V.I. Kopylov ◽  
D.I. Nikolayev ◽  
Heinz Günter Brokmeier
Keyword(s):  
Yield Strength ◽  
Equal Channel Angular Pressing ◽  
Texture Evolution ◽  
Axial Texture ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Texture Modification ◽  
Grain Formation ◽  
Strength And Plasticity ◽  
Zn Alloy

Equal channel angular pressing (ECAP) was used for grain refinement and texture modification in the initial pressed Mg-Al-Zn alloy to study the possibility to enhance the low-temperature deformability of the material. The effect of different ECAP regimes by routes A, C, and BC on the submicrocrystalline grain formation, texture evolution, and plasticity of the alloy have been investigated. The ECAP of the alloy results in the formation of ultrafine grained structure with a grain size of 0.8-3.5 µm independent of pressing routes and regimes. The ECAP also drastically changes the axial texture by splitting the initial texture characterized by a sharp basal component to several more scattered orientations. The degree of the orientation scattering depends on the ECAP regime and route. It is proposed to estimate the effect of the texture on the yield strength and plasticity of the alloy after ECAP through generalized Schmid factors. The comparable calculated and experimental results are obtained only for yield strength.

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.

Relationship between Grain Growth and Formation of Fracture Surface of Ultrafine Grained Cu in High-Cycle Fatigue

2016 ◽  
Vol 713 ◽  
pp. 147-150
Author(s):  
M. Goto ◽  
Seung Zeon Han ◽  
Takaei Yamamoto ◽  
J. Kitamura ◽  
Kamil Kusno ◽  
...  
Keyword(s):  
Fracture Surface ◽  
High Cycle Fatigue ◽  
Crack Tip ◽  
Plastic Zone Size ◽  
Fatigue Tests ◽  
Growth Behavior ◽  
Cycle Fatigue ◽  
Zone Size ◽  
Angular Pressing ◽  
Ultrafine Grained

Fatigue tests were conducted on specimens of ultrafine grained copper produced by equal channel angular pressing. The growth behavior of a fatal crack was monitored successively. The morphological features of the crack growth paths and fracture surfaces were influenced by variation of grain size and damaged areas of the crack tip, depending on the stage of progress of the fatigue damage. The change in fracture surface was discussed by considering the interrelation between the reversible plastic zone size at the crack tip and the microstructure evolved during cyclic stressing.

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