scholarly journals The evolution of coarse grains and its effects on weakened basal texture during annealing of a cold-rolled magnesium AZ31B alloy

2021 ◽  
Author(s):  
Xin Wang ◽  
Dikai Guan
Keyword(s):  
Basal Texture ◽  
Coarse Grains ◽  
Cold Rolled ◽  
Az31b Alloy

Enhancing Strength and Maintaining Ductility of Mg-3%Li-1%Sc Alloy by Equal Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 839-844
Author(s):  
Hua Jie Yang ◽  
X.H. Shao ◽  
S.X. Li ◽  
Shi Ding Wu ◽  
Z.F. Zhang
Keyword(s):  
Tensile Strength ◽  
Tensile Properties ◽  
Equal Channel Angular Pressing ◽  
Basal Texture ◽  
Angular Pressing ◽  
Coarse Grains ◽  
Texture Type ◽  
Shear Type ◽  
Small Grains ◽  
Strong Basal Texture

Equal channel angular pressing (ECAP) has been conducted on as-cast Mg-3%Li-1%Sc alloy for four-passes to study the microstructure uniformity and tensile properties. After ECAP, the microstructure become muddled, contains about 65% of deformed coarse grains with abundant low angle grain boundaries and about 35% of recrystallized small grains. Meanwhile, a strong basal texture is formed in the ECAP sample. The texture type of the recrystallized grains and the deformed grains are the same, however, the texture strength of the recrystallized grains is much lower than the deformed ones. Tensile strength is improved effectively and the elongation is maintained after ECAP. The increment of strength results from the microstructure refinement and residual dislocations produced by ECAP, while the recovery of ductility may be attributed to a shear type texture formed in the alloy during ECAP.

Distribution of Generalized Schmid Factor in Euler Orientation Space and Rollability of AZ31B Alloy with Basal Texture

2020 ◽  
Vol 29 (12) ◽  
pp. 8145-8155
Author(s):  
Baolin Wu ◽  
Linghui Song ◽  
Gang Wan ◽  
Xinghao Du ◽  
Jacques Muller ◽  
...  
Keyword(s):  
Basal Texture ◽  
Orientation Space ◽  
Schmid Factor ◽  
Az31b Alloy

Enhancement of ductility in Mg–3Al–1Zn alloy with tilted basal texture by electropulsing

2009 ◽  
Vol 24 (12) ◽  
pp. 3674-3679 ◽  
Author(s):  
Lei Guan ◽  
Guoyi Tang ◽  
Paul K. Chu ◽  
Yanbin Jiang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Tensile Ductility ◽  
Texture Evolution ◽  
Boundary Motion ◽  
Basal Texture ◽  
Rolled Sample ◽  
Cold Rolled ◽  
Electropulsing Treatment ◽  
Grain Boundary Motion

The microstructure and texture evolution in a cold-rolled AZ31 magnesium alloy during electropulsing treatment (EPT) are investigated and correlated with the mechanical properties. The microstructure is effectively refined, and a tilted basal texture develops gradually during EPT. The yield stress in the treated samples is lower than that in the cold-rolled sample, indicating that texture softening is dominant over strengthening because of grain refinement. The phenomenon is primarily the result of the tilted basal texture. EPT improves the tensile ductility of the EPT samples significantly, albeit slightly compromising the tensile strength. The mechanism of the microstructure evolution during electropulsing is discussed from the viewpoint of grain-boundary motion. Moreover, the ductility enhancement is discussed in terms of the deformation mechanism and texture of the Mg alloy.

scholarly journals Statistical Analysis on Static Recrystallization Texture Evolution in Cold-Rolled AZ31 Magnesium Alloy Sheet

2013 ◽  
Vol 19 (S5) ◽  
pp. 21-24 ◽  
Author(s):  
Jun-Ho Park ◽  
Tae-Hong Ahn ◽  
Hyun-Sik Choi ◽  
Jung-Man Chung ◽  
Dong-Ik Kim ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Thermomechanical Processing ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Alloy Sheet ◽  
Basal Texture ◽  
Rolled Sample ◽  
Az31 Magnesium Alloy Sheet ◽  
Cold Rolled ◽  
Grain Orientation Spread

AbstractCast AZ31B-H24 magnesium alloy, comprising Mg with 3.27 wt% Al and 0.96 wt% Zn, was cold rolled and subsequently annealed. Global texture evolutions in the specimens were observed by X-ray diffractometry after the thermomechanical processing. Image-based microstructure and texture for the deformed, recrystallized, and grown grains were observed by electron backscattered diffractometry. Recrystallized grains could be distinguished from deformed ones by analyzing grain orientation spread. Split basal texture of ca. ±10–15° in the rolling direction was observed in the cold-rolled sample. Recrystallized grains had widely spread basal poles at nucleation stage; strong {0001} basal texture developed with grain growth during annealing.

Characters of Coarse Grains Subdivisions in Rolled Polycrystalline Al

2007 ◽  
Vol 546-549 ◽  
pp. 1033-1036
Author(s):  
Qi Ping Hu ◽  
Yong Zhang ◽  
Yun Lai Deng
Keyword(s):  
High Purity ◽  
Electron Backscatter Diffraction ◽  
Coarse Grains ◽  
Electron Backscatter ◽  
Columnar Grains ◽  
Cold Rolled ◽  
Ebsd Technique ◽  
The Individual ◽  
Individual Grains ◽  
Backscatter Diffraction

Deformation microstructures and micro-orientations of columnar grains with different orientations in a polycrystalline high purity Al cold-rolled up to 65% (thickness reduction) were investigated using electron backscatter diffraction (EBSD) technique. It was found that rotations were Inhomogeneous within the individual grains, the rotation angles of the parts close to the initial boundaries (BPs) were smaller than those remote from the boundaries (IPs), e.g. the deviation angles between the BPs and the IPs were 5-6° in the grains with <001>//RD orientation, leading to the rotation along the α-fiber, while the deviation angles were 5-12° in the grains with <121>//ND orientation rotating toward the β-fiber. These results demonstrated that the microstructures and local rotations of various parts within the rolled individual columnar grains were influenced by their initial orientations and boundaries.

Grain Characteristics of 1235 Aluminum Alloy during Rolling

2020 ◽  
Vol 846 ◽  
pp. 77-81
Author(s):  
Wen Duan Yan ◽  
Gao Sheng Fu ◽  
Xiu Min Zhou ◽  
Dong Dong Chen
Keyword(s):  
Aluminum Alloy ◽  
Hot Rolling ◽  
Lattice Distortion ◽  
High Angle Boundary ◽  
Recrystallization Annealing ◽  
High Angle ◽  
Coarse Grains ◽  
Cold Rolled ◽  
Hot Rolled ◽  
Rolling Deformation

Grain characteristics of rolled 1235 aluminum alloy were studied by EBSD. The effects of hot rolling, cold rolling and rolling deformation on grain boundaries and grain size of the metal were studied as well. The content of high-angle boundaries was low by 16.48 % in 50 % hot-rolled 1235 aluminum alloy. The complete dynamic recrystallization occurred, and grains were coarse. During 90 % hot rolling, the low-angle boundaries turned into high-angle boundaries constantly. The content of high-angle boundaries was higher by 40.16 %. Coarse grains broke into fine grains, and grew into medium grains. In the 90 % cold-rolled alloy, the trace shape of high-angle boundary was irregular. The lattice distortion was large, providing the energy needed in recrystallization during recrystallization annealing.

Recrystallization of Coarse-Grained Nb-Containing AISI-430 Ferritic Stainless Steel

2010 ◽  
Vol 638-642 ◽  
pp. 3009-3014 ◽  
Author(s):  
Rodrigo P. Siqueira ◽  
Hugo Ricardo Zschommler Sandim ◽  
Tarcisio R. Oliveira
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Electron Backscatter Diffraction ◽  
Secondary Recrystallization ◽  
Coarse Grained ◽  
Ferritic Stainless Steels ◽  
Coarse Grains ◽  
Cold Rolled ◽  
Backscatter Diffraction ◽  
Aisi 430

Ferritic stainless steels (FSSs) have excellent corrosion resistance and good mechanical properties. Applications include heaters, houseware, and automotive exhaust systems. Alloying, even in small amounts, affects the recrystallization behavior of FSSs by selective dragging or pinning effects. In the present study, we present the main results regarding the recrystallization of a coarse-grained Nb-containing AISI 430 ferritic stainless steel. The material was processed by hot rolling and further annealed at 1250oC for 2 h to promote secondary recrystallization. Following, the material was cold rolled to a 80% reduction in thickness and annealed at 400-1000oC for 15 min. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) were used to characterize the microstructure. Recrystallization of this steel begins at 700oC. Important orientation effects were observed in both as-rolled and annealed conditions. Recrystallization kinetics was strongly dependent on the initial orientation of the coarse grains. Results show that grain boundaries, transition bands and coarse Nb(C,N) particles are preferential sites for nucleation at moderate annealing temperatures.

Enhancement of Reaction of Zinc on Superficially Nanocrystallized IF Steel by Near Surface-Severe Plasitc Deformation

2006 ◽  
Vol 512 ◽  
pp. 361-366 ◽  
Author(s):  
Yoritoshi Minamino ◽  
Nobuhiro Tsuji ◽  
Yuichiro Koizumi ◽  
Y. Nakamizo ◽  
M. Sato ◽  
...  
Keyword(s):  
Boundary Diffusion ◽  
Volume Diffusion ◽  
Interface Reaction ◽  
Layer Growth ◽  
If Steel ◽  
Layer Width ◽  
Near Surface ◽  
Coarse Grains ◽  
Cold Rolled ◽  
Diffusion Mass

The reaction between the zinc plate (ZP) and the IF steel with near surface ultra fine grains (NSUFG) structure with grain size of about 89 nm was studied in temperature range of 473K to 623K in order to elucidate the temperature dependence of the reactions and its mechanism, by comparison with the reactions of ZP to coarse grains (CG) sheet, superficial cold rolled CG sheet (CG+R) and superficial cold rolled NSUFG sheet (NSUFG+R). It was found that this NSUFG structure considerably affected reactions between IF steel and ZP. There was almost no effect of superficial cold rolling on their reactions, but the NSUFG structure dramatically enhanced the reactions. The incubation times for appearance of the reaction layer and its layer width of ZP /(NSUFG or NSUFG+R) reactions are shorter and thicker than those of the ZP/(CG or CG+R) ones. The activation energy for reaction was 107kJ/mol, which indicates that the volume diffusion in zinc side and the grain boundary diffusion in the iron side play an important role in the reaction. The layer growth up to the layer thickness less than about 10µm was controlled mainly by the interface reaction and it over about 10µm mainly by the diffusion mass transfer.

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