Improvement of the r-value in 5052 aluminum alloy sheets having through-thickness shear texture by 2-pass single-roll drive unidirectional shear rolling

2001 ◽  
Vol 44 (11) ◽  
pp. 2569-2573 ◽  
Author(s):  
Tetsuo Sakai ◽  
Syuichi Hamada ◽  
Yoshihiro Saito
Keyword(s):  
Aluminum Alloy ◽  
Shear Texture ◽  
R Value ◽  
Thickness Shear ◽  
Roll Drive

Formation of Shear Texture and Ultra-Fine Grains during Equal Angular Channel Rolling and Subsequent Annealing in AA 3003 Sheet

2004 ◽  
Vol 449-452 ◽  
pp. 873-876 ◽  
Author(s):  
Moo Young Huh ◽  
J.P. Lee ◽  
Jae Chun Lee ◽  
Jong Woo Park ◽  
Young Hoon Chung
Keyword(s):  
Aluminum Alloy ◽  
Shear Deformation ◽  
Subsequent Annealing ◽  
Recrystallization Annealing ◽  
Shear Texture ◽  
First Passage ◽  
Random Texture ◽  
Constant Shear

The evolution of texture and microstructure during the equal channel angular rolling (ECAR) and subsequent annealing in aluminum alloy 3003 sheets was investigated. The tools of ECAR were designed to provide a constant shear deformation of the order of 0.5 per passage while preserving the original sheet shape. Samples of the aluminum alloy 3003 sheets were repeatedly deformed by ECAR up to twelve passages. Shear textures developed after the first passage of ECAR. However, the intensity of shear texture components decreased with increasing number of ECAR passages. After a large number of ECAR passages, a random texture developed at the expense of shear texture components. Observations by TEM and EBSD revealed that the degree of misorientations within the deformed grains increased with increasing number of ECAR passages. After recrystallization annealing, samples deformed by ECAR displayed pronounced {111}//ND fiber orientations. The annealed sheets comprising of ultra-fine grains were successfully produced in the samples deformed by a large number of ECAR passages.

Texture Evolution of Friction-Stir-Welded 5A30 Aluminum Alloy Plate

2014 ◽  
Vol 599-601 ◽  
pp. 136-139
Author(s):  
Wen Ying Gan ◽  
Zheng Zhou ◽  
Li Xin Wang ◽  
Yong Gang Wu
Keyword(s):  
Aluminum Alloy ◽  
Simple Shear ◽  
Texture Evolution ◽  
Shear Texture ◽  
Alloy Plate ◽  
Friction Stir ◽  
Complete Recrystallization ◽  
Aluminum Alloy Plate

In the present study, the texture of friction-stir-weled 5A30 aluminum alloy was investigated by EBSD technology. Cubic texture {100}<100> is obtained in the shoulder-affected region of NZ due to the complete recrystallization. The dominate texture in the pin-affected region of NZ is the {112}<110> B/ simple shear texture induced by the rotation pin.

334 Texture Control of Aluminum Alloy Sheets by Single-Roll Drive Rolling

2001 ◽  
Vol 2001.9 (0) ◽  
pp. 359-360
Author(s):  
Tetsuo SAKAI ◽  
Hajime INAGAKI ◽  
Yoshihoro SAITO
Keyword(s):  
Aluminum Alloy ◽  
Roll Drive

Microstructure and Texture Control of Al-Mg Alloy Sheets by Differential Speed Rolling

2005 ◽  
Vol 495-497 ◽  
pp. 597-602 ◽  
Author(s):  
Tetsuo Sakai ◽  
K. Yoneda ◽  
S. Osugi
Keyword(s):  
Shear Strain ◽  
Shear Deformation ◽  
Rolling Direction ◽  
Deformation Texture ◽  
Speed Ratio ◽  
Roll Speed ◽  
Shear Texture ◽  
Differential Speed Rolling ◽  
R Value ◽  
Differential Speed

Large shear deformation was successfully introduced in 5182 aluminum alloy sheets by 2-pass differential speed warm rolling under a high friction condition. The roll speed ratio was varied from 1.0 to 2.0. When the roll speed ratio was smaller than 1.4, shear strain increased near the surface, but the strain decreased to zero at the mid-thickness. At a roll speed ratio larger than 1.4, shear strain was introduced even at the mid-thickness, and it increased near the surface. Thus the shear strain increased with the roll speed ratio. After 2-pass differential speed rolling, a large shear strain prevailed throughout the thickness. The rolling direction of the second pass was so selected that the direction of shear deformation introduced in the second pass was similar to (unidirectional shear rolling) or opposite (reverse shear rolling) that in the first pass. A shear texture with main components of {111}<110>, {112}<110> and {001}<110> prevailed throughout the thickness, and conventional rolling textures such as {112}<111> or {123}<634> orientation were not detected in any part of thickness. The rolling direction of the second pass had little effect on the deformation texture. After recrystallization annealing, the shear texture components were retained. The intensity of the shear texture components after recrystallization was almost similar to the deformation texture. The r-value of the annealed sheet was slightly increased and the planar anisotropy of the r-value was decreased by differential speed rolling. Differential speed rolling, by which shear deformation can be introduced throughout the thickness, was thus shown to be a promising process for improving the physical and mechanical properties of rolled and annealed aluminum alloy sheets by texture control.

Control of Through-Thickness Shear Texture by Asymmetric Rolling

2002 ◽  
Vol 396-402 ◽  
pp. 309-314 ◽  
Author(s):  
Taku Sakai ◽  
K. Yoneda ◽  
Yoshiyuki Saito
Keyword(s):  
Asymmetric Rolling ◽  
Shear Texture ◽  
Thickness Shear

A comparison of continuous SPD processes for improving the mechanical properties of aluminum alloy 6111

2009 ◽  
Vol 24 (2) ◽  
pp. 459-469 ◽  
Author(s):  
R. Lapovok ◽  
L.S. Tóth ◽  
M. Winkler ◽  
S.L. Semiatin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Velocity ◽  
Asymmetric Rolling ◽  
Shear Texture ◽  
Angular Pressing ◽  
Grain Structures ◽  
Billet Material ◽  
Conventional Rolling ◽  
Aluminum Alloy 6111

Microstructure evolution, mechanical properties, formability, and texture development were determined for AA6111 samples processed by asymmetric rolling (ASR) with different roll friction, velocity, or diameters, conventional rolling (CR), and equal-channel-angular pressing (ECAP). Highly elongated or sheared grain structures were developed during ASR/CR and ECAP, respectively. ASR led to improved r-values and formability compared with CR primarily as a result of the development of moderate shear-texture components analogous to those developed during ECAP of billet material. ASR based on different roll diameters gave the best combination of strength, ductility, and formability.

Texture and Correlation between R-Value and Formability of Aluminum Alloy Sheet

2011 ◽  
Vol 702-703 ◽  
pp. 356-359
Author(s):  
Ni Tian ◽  
Gang Zhao ◽  
Bo Nie ◽  
Jian Jun Wang ◽  
Liang Zuo ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Pure Aluminum ◽  
Alloy Sheet ◽  
The Other ◽  
Second Phase ◽  
Aluminum Alloy Sheet ◽  
Plastic Strain Ratio ◽  
N Value ◽  
R Value

The texture, microstructure, plastic strain ratio r value, elongation, strain hardening index n, the value of cupping test IE, and the correlation between r value and the other formability indices of two automotive aluminum alloys sheet 6016 and 6181, and commercial pure aluminum sheet were investigated. The results showed that the recrystallization textures of three aluminum alloys sheet are similar to each other, which mainly contain cube component. However, the r and n value, elongation, and IE of three aluminum alloys sheet are different from each other evidently, and there is no correlation between texture and r value, and the other formability indices except the n value. The large quantity of second-phase particles in the aluminum alloy matrix has very important effect on both the r value and the formability of aluminum alloy sheet.

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