scholarly journals Influence of Uniaxial Deformation on Texture Evolution and Anisotropy of 3104 Al Sheet with Different Initial Microstructure

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1729
Author(s):  
Sofia Papadopoulou ◽  
Vasilis Loukadakis ◽  
Zisimos Zacharopoulos ◽  
Spyros Papaefthymiou
Keyword(s):  
Tensile Testing ◽  
Thermomechanical Processing ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Alloy Sheet ◽  
Microstructural Parameters ◽  
Cold Rolled ◽  
Underlying Mechanisms ◽  
Microstructural Anisotropy

Optimum mechanical behavior is achieved by means of controlling microstructural anisotropy. The latter is directly related to the crystallographic texture and is considerably affected by thermal and mechanical processes. Therefore, understanding the underlying mechanisms relating to its evolution during thermomechanical processing is of major importance. Towards that direction, an attempt to identify possible correlations among significant microstructural parameters relating to texture response during deformation was made. For this purpose, a 3104 aluminum alloy sheet sample (0.5 mm) was examined in the following states: (a) cold rolled (with 90% reduction), (b) recovered and (c) fully recrystallized. Texture, anisotropy as well as the mechanical properties of the samples from each condition were examined. Afterwards, samples were subjected to uniaxial loading (tensile testing) while the most deformed yet representative areas near the fractured surfaces were selected for further texture analysis. Electron backscatter diffraction (EBSD) scans and respective measurements were conducted in all three tensile test directions (0°, 45° and 90° towards rolling direction (RD)) by means of which the evolution of the texture components, their correlation with the three selected directions as well as the resulting anisotropy were highlighted. In the case of the cold-rolled and the recovered sample, the total count of S2 and S3 components did not change prior to and after tensile testing at 0° towards RD; however, the S2 and S3 sum mostly consisted of S3 components after tensile testing whereas it mostly consisted of S2 components prior to tensile testing. In addition, the aforementioned state was accompanied by a strong brass component. The preservation of an increased amount of S components, and the presence of strain-free elongated grains along with the coexistence of a complex and resistant-to-crack-propagation substructure consisting of both high-angle grain boundaries (HAGBs) and subgrain boundaries (SGBs) led into an optimal combination of Δr and rm parameters.

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.

Microstructure and Texture Evolution in Cold Rolled Interstitial Free (IF) Steel Sheet during Annealing under AC Magnetic Field

2010 ◽  
Vol 638-642 ◽  
pp. 2781-2786
Author(s):  
Chang Shu He ◽  
Sadahiro Tsurekawa ◽  
Hiroyuki Kokawa ◽  
Xiang Zhao ◽  
Liang Zuo
Keyword(s):  
Magnetic Field ◽  
Steel Sheet ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Recrystallization Annealing ◽  
Interstitial Free ◽  
If Steel ◽  
Ac Magnetic Field ◽  
Cold Rolled ◽  
If Steel Sheet

An AC magnetic field (0.5Tesla) is applied with the field direction perpendicular to the rolling direction during annealing of a 76% cold-rolled IF steel sheet. Microstructure and texture evolution in the as-annealed specimens were determined using SEM based OIM technique. It is found that the recrystallization is noticeably retarded by AC magnetic field annealing. At the early stage of recrystallization (annealing at 650°C for 30min), the development of (111) <123> orientations was favored by the AC magnetic field. With progress of recrystallization (annealing at 700°C and 750°C for 30min), the applied AC magnetic field suppressed the development of γ-fiber recrystallization textures to some extent.

Texture Evolution during Hot Rolling Deformation in Al-5wt%Mg Alloy

2007 ◽  
Vol 345-346 ◽  
pp. 89-92
Author(s):  
Shi Hoon Choi ◽  
Y.S. Song ◽  
Jong Kweon Kim ◽  
Hyoung Wook Kim ◽  
Suk Bong Kang
Keyword(s):  
Hot Rolling ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Surface Region ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Strip Cast ◽  
Hot Rolled ◽  
Backscatter Diffraction ◽  
Rolling Deformation

Evolution of crystallographic texture by hot rolling deformation at the temperature of 200°C was investigated by hot rolling tests on as-cast Al-5wt%Mg alloy fabricated by a new strip cast technology. Texture variation through the thickness direction in the Al-5wt%Mg alloy was examined experimentally. Macrotexture and microtexture measurements were conducted using X-ray diffractometer and electron backscatter diffraction (EBSD), respectively. Experimental investigation reveals that the evolution of texture and microstructure is strongly dependent on a distance from center of the Al-5wt%Mg alloy sheet. It was found that the shear texture components tend to be increased at the surface region of the hot-rolled specimen.

Effect of Electric Current Direction on Texture Evolution in a Cold Rolled Fe-3%Si Steel under Electric Current Pulses Treatment

2012 ◽  
Vol 706-709 ◽  
pp. 2366-2371 ◽  
Author(s):  
Xin Li Wang ◽  
Hong Ming Zhao ◽  
Wen Bin Dai ◽  
Xiang Zhao
Keyword(s):  
Electric Current ◽  
Recrystallization Texture ◽  
Current Flow ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Current Direction ◽  
Goss Texture ◽  
Current Pulses ◽  
Electric Current Pulses ◽  
Cold Rolled

The effect of electric current on the recrystallization texture evolution with the rolling direction both parallel and perpendicular to the current flow during electric current pulses (ECP) treatment was investigated. The results showed that the exerted current direction played a great role on the formation of recrystallization texture {111}<112> and Goss texture {011}<100> at the primary stage of recrytallization induced by ECP treatment. However, with the current density increasing, the effect of current direction on texture evolution almost could be ignored and the final texture components in the two cases all are Goss texture.

Relating Grain Misorientation to the Corrosion Behaviour of Low Copper 7xxx Aluminium Alloys

2013 ◽  
Vol 765 ◽  
pp. 623-628
Author(s):  
Alexander Cassell ◽  
George E. Thompson ◽  
Xiao Rong Zhou ◽  
Teruo Hashimoto ◽  
Geoff Scamans
Keyword(s):  
Aluminium Alloys ◽  
Thermomechanical Processing ◽  
Electron Backscatter Diffraction ◽  
Corrosion Behaviour ◽  
High Strength ◽  
Alloy Sheet ◽  
Orientation Relationships ◽  
Accelerated Corrosion ◽  
Boundary Precipitate ◽  
Grain Misorientation

High strength aluminium alloys provide benefits in vehicle efficiency and reduced energy consumption. Weldable, low copper 7xxx aluminium alloys are being developed for body-in-white production. Here, the influences of thermomechanical history on microstructure and, consequently, on the corrosion behaviour of lean 7xxx aluminium alloy sheet have been investigated. Cold worked microstructures in the alloys studied are susceptible to sub-surface cracking after accelerated corrosion testing. High resolution transmission electron microscopy (HAADF) with allied EDX analysis of a warm rolled alloy has revealed significant differences between some grain boundaries, showing differences in grain boundary precipitate distribution, which is influenced by grain misorientation and thermomechanical processing history. Possible relationships between the previously described phenomena are being sought. Electron backscatter diffraction has been employed to provide crystallographic information concerning grain orientation relationships from specific areas surrounding the attacked microstructure.

Orientation Dependence of the Texture Evolution in Cold-Rolled Thin Foils of Ni3Al Single Crystals

2002 ◽  
Vol 753 ◽  
Author(s):  
Kyosuke Kishida ◽  
Masahiko Demura. Yozo Suga ◽  
Toshiyuki Hirano
Keyword(s):  
Single Crystals ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Rolling Texture ◽  
Orientation Dependence ◽  
Microstructure Observation ◽  
Thin Foils ◽  
Cold Rolled ◽  
Macroscopic Shape ◽  
Initial Crystal

ABSTRACTTexture evolutions of cold-rolled thin foils of binary stoichiometric Ni3Al single crystals were examined as a function of the initial crystal orientation. In the cases of the initial rolling direction (RD) close to <001>, the rolling texture above 90% reduction is composed of two {110}<112> textures, which resulted from the formation of the banded structure with two types of differently oriented matrix bands. The macroscopic shape of these cold-rolled foils is straight and simply elongated along RD keeping their rectangular shape. In contrast, when the initial RD is close to <112>, the texture and the microstructure are rather uniform but the foils are curved, twisted, and eventually cracked from the side edge of the samples. Based on the analysis of the texture evolution and the microstructure observation, the operative slip systems were determined.

Strain-Hardening Behavior of Mg-Li-Zn Alloy Thin Sheets under Tension

2010 ◽  
Vol 146-147 ◽  
pp. 1361-1364 ◽  
Author(s):  
Horng Yu Wu ◽  
Pin Hou Sun ◽  
Chui Hung Chiu ◽  
Geng Zhong Zhou
Keyword(s):  
Strain Hardening ◽  
Room Temperature ◽  
Rolling Direction ◽  
Tensile Tests ◽  
Alloy Sheet ◽  
Stage Ii ◽  
Cold Rolled ◽  
Strain Hardening Behavior ◽  
Zn Alloy ◽  
Li Content

This work examined the effects of Li content on the strain-hardening behaviors of three varieties of Mg−Li−Zn alloys containing approximately 6 wt%, 9 wt%, and 10 wt% of Li. Tensile tests were carried out on specimens in the directions of 0, 45 and 90° to the rolling direction. Kocks–Mecking type plots were constructed to illustrate different stages of strain-hardening. The cold-rolled Mg−6Li−1Zn (designated as LZ61) alloy sheet showed stage II and stage III strain-hardening behaviors at room temperature. The specimens of Mg−9Li−1Zn (designated as LZ91) and Mg−10Li−1Zn (designated as LZ101) alloy sheets did not show stage II strain-hardening. Higher initial strain-hardening rates were observed in the 90° direction for these alloys as a result of the cold-rolled fibrous structure affording stronger barriers to dislocation movements in this direction.

scholarly journals The Edge Crack, Texture Evolution, and Mechanical Properties of Mg-1Al-1Sn-Mn Alloy Sheets Prepared Using On-Line Heating Rolling

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 860 ◽  
Author(s):  
Qiang Liu ◽  
Jiangfeng Song ◽  
Fusheng Pan ◽  
Jia She ◽  
Shuo Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Rolling Temperature ◽  
Line Heating ◽  
Basal Pole ◽  
On Line ◽  
Edge Cracks ◽  
Conventional Rolling

A series of Mg-1Al-1Sn-Mn magnesium alloy sheets were rolled from 3 mm to 1 mm under temperatures of 150 °C, 200 °C, and 250 °C in four rolling passes using on-line heating rolling. The conventional rolling was also performed for comparison. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) technologies were utilized to characterize the edge cracks as well as the microstructure of rolled thin sheets. The result revealed that the number of edge cracks decreased dramatically with the increase of rolling temperature. No visible edge cracks were found on the surface of sheets rolled at 250 °C by on-line heating rolling, while the conventional rolling at the same temperature still resulted in severe edge cracks. The intensity of the basal texture for on-line rolled sheets increased from 4.982 to 9.596 as the rolling temperature increased from 150 °C to 250 °C, which was related to the reorientation of new grains and deformation grains remained after rolling. The direction of the basal pole slightly tilted towards the rolling direction (RD), which may be mainly attributed to the activation of a pyramidal slip, as well as the tension imposed on the samples. Moreover, mechanical properties were improved after rolling on the basis of the strong texture and grain refinement. The highest yield strength (YS), ultimate tensile strength (UTS), and the maximum elongation of the rolled sheets were 148 MPa, 298 MPa, and 14.6% along the RD, respectively.

Sign in / Sign up

Export Citation Format

Share Document