Role of stacking fault energy and strain rate in strengthening of Cu and Cu–Al alloys

2014 ◽  
Vol 29 (16) ◽  
pp. 1747-1754 ◽  
Author(s):  
Baozhuang Cai ◽  
Yan Long ◽  
Cuie Wen ◽  
Yulan Gong ◽  
Caiju Li ◽  
...  
Keyword(s):  
Strain Rate ◽  
Al Alloys ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Image Position

Abstract

Role of stacking fault energy (SFE) on the high strain rate deformation of cold sprayed Cu and Cu-Al alloy coatings

2021 ◽  
pp. 141242
Author(s):  
Naveen Manhar Chavan ◽  
P. Sudharshan Phani ◽  
M. Ramakrishna ◽  
L. Venkatesh ◽  
Prita Pant ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Al Alloy ◽  
High Strain Rate Deformation

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.

Grain size effect on deformation twin thickness in a nanocrystalline metal with low stacking-fault energy

2019 ◽  
Vol 34 (13) ◽  
pp. 2398-2405
Author(s):  
Yusheng Li ◽  
Liangjuan Dai ◽  
Yang Cao ◽  
Yonghao Zhao ◽  
Yuntian Zhu
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Deformation Twin ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Grain Size Effect ◽  
Nanocrystalline Metal ◽  
Image Position ◽  
Twin Thickness

Abstract

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.

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