Influence of stacking fault energy on twin spacing of Cu and Cu–Al alloys

2014 ◽  
Vol 83 ◽  
pp. 33-36 ◽  
Author(s):  
Leonardo Velasco ◽  
Mikhail N. Polyakov ◽  
Andrea M. Hodge
Keyword(s):  
Al Alloys ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Twin Spacing

scholarly journals Correlation of Grain Size, Stacking Fault Energy, and Texture in Cu-Al Alloys Deformed under Simulated Rolling Conditions

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Ehab A. El-Danaf ◽  
Mahmoud S. Soliman ◽  
Ayman A. Al-Mutlaq
Keyword(s):  
Grain Size ◽  
Strain Hardening ◽  
Mechanical Twinning ◽  
Al Alloys ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Wide Range ◽  
Orientation Density ◽  
Pure Cu ◽  
Strain Hardening Rate

The effect of grain size and stacking fault energy (SFE) on the strain hardening rate behavior under plane strain compression (PSC) is investigated for pure Cu and binary Cu-Al alloys containing 1, 2, 4.7, and 7 wt. % Al. The alloys studied have a wide range of SFE from a low SFE of 4.5 mJm−2for Cu-7Al to a medium SFE of 78 mJm−2for pure Cu. A series of PSC tests have been conducted on these alloys for three average grain sizes of ~15, 70, and 250 μm. Strain hardening rate curves were obtained and a criterion relating twinning stress to grain size is established. It is concluded that the stress required for twinning initiation decreases with increasing grain size. Low values of SFE have an indirect influence on twinning stress by increasing the strain hardening rate which is reflected in building up the critical dislocation density needed to initiate mechanical twinning. A study on the effect of grain size on the intensity of the brass texture component for the low SFE alloys has revealed the reduction of the orientation density of that component with increasing grain size.

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.

scholarly journals Nanoscale Twinned Ti-44Al-4Nb-1.5Mo-0.007Y Alloy Promoted by High Temperature Compression with High Strain Rate

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 619 ◽  
Author(s):  
Wenqi Guo ◽  
Haitao Jiang ◽  
Shiwei Tian ◽  
Guihua Zhang
Keyword(s):  
Strain Rate ◽  
High Strain ◽  
Aerospace Industry ◽  
Dynamic Strength ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Tial Alloys ◽  
Partial Dislocations ◽  
Dynamic Mechanical Behavior ◽  
Twin Spacing

In order to investigate the dynamic mechanical behavior of TiAl alloys and promote their application in the aerospace industry, uniaxial compression of Ti-44Al-4Nb-1.5Mo-0.007Y (at %) alloy was conducted at a temperature range from 25 to 400 °C with a strain rate of 2000 s‒1. Twinning is found to be the dominating deformation mechanism of the γ phase at all temperatures, and the addition of Nb and Mo has a chemical impact on the alloy and reduces the stacking fault energy of the γ phase. The decreased stacking fault energy increases the twinnability; thus, the deformation is dominated by twinning, which increases the dynamic strength of the alloy. With the temperature increasing from 25 to 400 °C, the average spacing of twins in the γ phase increases from 32.4 ± 2.9 to 88.1 ± 9.2 nm. The increased temperature impedes the continuous movement of partial dislocations and finally results in an increased twin spacing in the γ phase.

An x-ray diffraction study of the effect of stacking fault energy on the wear behavior of Cu-Al alloys

Wear ◽  
1983 ◽  
Vol 92 (2) ◽  
pp. 213-229 ◽  
Author(s):  
J.J. Wert ◽  
S.A. Singerman ◽  
S.G. Caldwell ◽  
D.K. Chaudhuri
Keyword(s):  
Diffraction Study ◽  
Wear Behavior ◽  
Al Alloys ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Ductility Sensitivity to Stacking Fault Energy and Grain Size in Cu–Al Alloys

2016 ◽  
Vol 4 (2) ◽  
pp. 112-117 ◽  
Author(s):  
Yanzhong Tian ◽  
Akinobu Shibata ◽  
Zhefeng Zhang ◽  
Nobuhiro Tsuji
Keyword(s):  
Grain Size ◽  
Al Alloys ◽  
Stacking Fault ◽  
Stacking Fault Energy
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