Deformation Texture and Microstructure Evolution in Nickel and Nickel-Cobalt Alloys

2014 ◽  
Vol 783-786 ◽  
pp. 2597-2601
Author(s):  
R. Madhavan ◽  
Ranjit K. Ray ◽  
Satyam Suwas
Keyword(s):  
Texture Evolution ◽  
True Strain ◽  
Shear Banding ◽  
Shear Bands ◽  
Rolling Texture ◽  
Cobalt Content ◽  
Pure Nickel ◽  
Cobalt Alloys ◽  
Goss Texture ◽  
Nickel Cobalt

Rolling texture evolution of pure nickel, and nickel – cobalt alloys containing 20wt.%, 40wt.%, 60wt.% cobalt content has been studied to very large true strain (ε ~ 4). The texture evolution in pure nickel and Ni-20Co was very similar, and resulted in typical Cu-type rolling texture. Microstructural analyses showed that the deformation was mostly slip dominated up to 95% beyond which it shear bands. Deformation twinning was a major deformation mechanism up to 50% reduction, and at higher strains, microstructure showed extensive shear banding. The evolution of final Goss texture in low SFE Ni-Co alloys could be explained based on the twin fraction and shear band volumes which showed grains preferably oriented towards Goss.

Shear Banding in Polycrystalline Aluminium and Copper Pre-Deformed by ECAP and Subsequently Plane Strain Compressed

2016 ◽  
Vol 716 ◽  
pp. 240-247
Author(s):  
Henryk Paul ◽  
Magdalena M. Miszczyk
Keyword(s):  
Crystal Lattice ◽  
Grain Boundaries ◽  
Texture Evolution ◽  
Shear Banding ◽  
Shear Bands ◽  
Shear Plane ◽  
Lattice Rotation ◽  
Pure Aluminium ◽  
Electron Backscattered Diffraction ◽  
Angular Pressing

The microstructure and texture evolution in commercially pure aluminium (AA1050 alloy) and copper have been characterized after change in strain path to elucidate the mechanisms of shear bands (SBs) formation and propagation across grain boundaries. Samples were pre-deformed in equal channel angular pressing (ECAP) and further compressed in a channel-die to form two sets of macro-SBs. The deformation-induced sub-structures and local changes in crystallographic orientations were characterized by scanning electron microscopy equipped with a high-resolution electron backscattered diffraction facility. It was found that the mechanism of micro-/macro-SBs formation is strictly crystallographic. In all the grains of the sheared zone a strong tendency to strain-induced re-orientation could be observed. Their crystal lattice rotated in such a way that one of the {111} slip planes became nearly parallel to the shear plane and the <011> (or <112>) direction became parallel to the direction of maximum shear. This crystal lattice rotation led to the formation of specific SBs components which facilitates slip propagation across grain boundaries without any visible variation in the slip direction.

scholarly journals Microstructure and Texture Evolution of Aluminum in the Al-Nb/Ti/Ni Composite Fabricated by the ARB Process

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Nan Ye ◽  
Xueping Ren
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Texture Evolution ◽  
Shear Bands ◽  
Rolling Texture ◽  
Shear Texture ◽  
Electron Backscattered Diffraction ◽  
Transmission Electron ◽  
Average Grain Size ◽  
Ebsd Technique

The Al-Nb/Ti/Ni composite was fabricated from pure Al, Ni, Ti, and Nb sheets by the ARB technology. The microstructure evolution was observed by scanning electron microscopy, x-ray diffraction, and transmission electron microscopy. The evolution was evaluated by the electron backscattered diffraction (EBSD) technique. A couple of results we obtained showed that the microstructure of Al changed from equiaxed grains to a lamellar structure, and the grain size in the ND decreased gradually. Finally, the average grain size in the ND was 0.31 μm. Additionally, the fraction of HAGBs increased after the third pass, resulting from the dynamic recovery and the shear bands. The texture evolution was tested by electron backscattered diffraction. After the fourth pass, the Al exhibited a combination texture of rolling texture and shear texture. The rolling texture components were composed of Copper{112}<111>, Dillamore{4 4 11}<11 11 8>, S{123}<634>, and Brass{011}<211>, and the shear texture components were Rotated Cube {001}<110> and {111}//ND. The microhardness of Ni, Ti, Nb, and Al was improved in the ARB process and finally reached 226.4, 246.3, 187.2, and 44.2 HV, respectively.

scholarly journals Effect of Slab Reheating Temperature on Cold Rolling Texture Evolution of Nb-Containing Grain-Oriented Silicon Steel

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1478
Author(s):  
Liguang Wang ◽  
Shuhuan Wang ◽  
Jie Li ◽  
Jinyu Liang ◽  
Yunli Feng
Keyword(s):  
Cold Rolling ◽  
Texture Evolution ◽  
Cube Texture ◽  
Rolling Texture ◽  
Rolling Process ◽  
Silicon Steel ◽  
Single Stage ◽  
Two Stage ◽  
Goss Texture ◽  
Key Factor

Texture control of grain-oriented silicon steel is the key factor to ensure the magnetic properties of the finished product. Nb-containing grain-oriented silicon steel with different slab reheating temperatures was hot rolled followed by single-stage or two-stage cold rolling, and the textures were also analyzed. In the single-stage cold rolling process, as the slab reheating temperature is reduced, the intensity of the rotating cube texture {100}<011> and Goss texture {011}<100> drops, and that of the {111}<112> texture increases. In the two-stage cold rolling process, with the decrease in the slab reheating temperature, the intensity of the {111}<112> texture increases from 4.958 to 6.809. At the same slab reheating temperature, the intensity of the rotating cube texture declines more significantly in the two-stage cold rolling process. Finally, two-stage cold rolling with the slab reheating temperature of 1220 °C is found to be more beneficial for the formation of a sharp Goss texture during the second recrystallization. The magnetic induction intensity B800 of the final product is 1.87T, and the iron loss P1.7/50 is 1.36 W/kg.

Goss Texture Evolution in a Grain-Oriented Fe-6.5wt%Si Steel Processed by Strip-Casting

2021 ◽  
Vol 1016 ◽  
pp. 1653-1658
Author(s):  
Xiang Liu ◽  
Hai Jie Xu ◽  
Zhen Yu Gao ◽  
Yun Bo Xu ◽  
Jing Yu ◽  
...  
Keyword(s):  
Texture Evolution ◽  
Shear Bands ◽  
Secondary Recrystallization ◽  
Strip Casting ◽  
Goss Texture ◽  
Abnormal Growth ◽  
Core Losses ◽  
The Matrix ◽  
Columnar Grains ◽  
Rolling Route

Fe-6.5wt%Si steel is an excellent soft magnetic material due to the near-zero magnetostriction and low core losses. In this study, a 0.3 mm-thick grain-oriented 6.5wt%Si steel sheet was produced by a novel strip casting and two-stage rolling. The microstructure and texture evolution were investigated with a special emphasis on the nucleation and growth of Goss grains. The thin normalized strip was composed of large columnar grains and small equiaxed grains. During intermediate annealing, Goss grains nucleated in the shear bands of the deformed <111>//ND grains, and the deformed {111}<112> grains provided most of the nucleation sites. After primary annealing, the Goss grains distributed across the entire thickness, which was different from the conventional rolling route. The fraction of high-angle boundaries (20°-45°) surrounding the Goss grains was apparently higher than those of the matrix grains, which promoted the abnormal growth of the Goss grains during secondary recrystallization.

MAGNETIC PROPERTIES OF NICKEL-COPPER AND NICKEL-COBALT ALLOYS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1937-C8-1938 ◽  
Author(s):  
D. C. Jiles ◽  
T. T. Chang ◽  
D. R. Hougen ◽  
R. Ranjan
Keyword(s):  
Magnetic Properties ◽  
Cobalt Alloys ◽  
Nickel Cobalt ◽  
Nickel Copper

scholarly journals O2 evolution on nickel-cobalt alloys

1986 ◽  
Vol 31 (12) ◽  
pp. 1541-1551 ◽  
Author(s):  
J. Haenen ◽  
W. Visscher ◽  
E. Barendrecht
Keyword(s):  
O2 Evolution ◽  
Cobalt Alloys ◽  
Nickel Cobalt
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