Textures and stretch formability of Mg–6Al–1Zn magnesium alloy sheets rolled at high temperatures up to 793 K

Huang, Xinsheng; Suzuki, Ken; Saito, Naobumi

doi:10.1016/j.scriptamat.2008.12.035

Cited by 156 publications

(58 citation statements)

References 12 publications

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“…The relation between strong basal texture and the anisotropy of mechanical properties in magnesium alloys has been previously observed by many researchers, and the reduction of anisotropy was related to the reduction of a strong basal texture [8,17]. However, in this study, the reduction of mechanical property anisotropy is related to the change of the main texture components and its effect on the activation of twining and pyramidal slip systems.…”

Section: Fig 4 Work-hardening Curves From Tensile Tests Of Investigmentioning

confidence: 47%

“…To enhance the ductility and reduce the anisotropy of the mechanical properties of magnesium alloys by means of weakening the basal texture, the temperature of the process can be increased. Thus, processes like hot rolling or hot extrusion may be applied [8,9]. But the high temperature of processing annihilates the hardening effects of plastic deformation [10].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties and Structure Evolution of the Az91 Magnesium Alloy After Hot Rolling and Annealing

Sułkowski

Boczkal

2015

mafe

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Mechanical properties and structure evolution of the AZ91 magnesium alloy after hot rolling and annealing Właściwości mechaniczne oraz struktura stopu AZ91 po walcowaniu na gorąco i wyżarzaniu AbstractThe AZ91 magnesium alloy was processed up to 87.5% of total thickness reduction in several thermodynamic routes, consisted of hot rolling and intermediate annealing. The hot-rolling process was performed at a high strain rate equal to 1.6 s −1 and at a temperature of 430°C. The intermediate annealing was performed at 430°C for 15 minutes after each route. It was found that, during hot rolling, the hardness of the material increased from 32 HV to 40 HV, and the structure investigations showed a huge amount of twins formed inside the grains (which were not observed after annealing). Tensile tests have shown strong anisotropy in mechanical properties of the "as-rolled" samples dependent on the orientation between tension direction (TD) and rolling direction (RD). The samples with TD perpendicular to RD proved higher ultimate tensile strength (UTS) and (on the other hand) worse plastic properties as compared to the samples with TD parallel to RD. The annealing has an effect on the reduction of mechanical properties anisotropy. X-ray investigations have shown texture changes from the basal type with the additional (0001) <1120> component for "as-rolled" samples to the texture with the main (0001) <1010> component for annealed samples. The texture changes had a great impact on the anisotropy of mechanical properties of the investigated AZ91 magnesium alloy.

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Section: Fig 4 Work-hardening Curves From Tensile Tests Of Investigmentioning

confidence: 47%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Structure Evolution of the Az91 Magnesium Alloy After Hot Rolling and Annealing

Sułkowski

Boczkal

2015

mafe

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“…For the specimen annealed at 623 K for 1 h, equi-axed grains, whose sizes are 6 mm and 7 mm respectively, are observed and the fraction of low angle grain boundaries (LAGB) also decreases, which indicates it is the initial stage of static recrystallization (SRX). 13) Figure 3 shows that the average grain size of specimens is reduced after cross-roll rolling and annealing. It is probable that the grain refinement is due to the recrystallization of the mechanical twins which are formed by warmrolling during annealing.…”

Section: Methodsmentioning

confidence: 99%

Microstructures and Texture Development of the Cross-Roll Rolled AZ31 Alloy Sheet at High Temperature

et al. 2011

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The texture development and microstructural evolution have been investigated for the AZ31 alloys rolled by cross-roll rolling at 823 K. After the AZ31 magnesium sheets were rolled by cross-roll rolling at 823 K, the total reduction in thickness of 65% were achieved after two pass rolling. The resultant microstructures are homogeneous and refined for the surface and center layers. The (0002) basal texture is significantly weakened after annealing at 623 K for 1 h for the cross-roll rolled sheets.

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“…One is improved rolling technologies such as differential speed rolling, [1][2][3] cross rolling 4) and high temperature rolling. 2,3,5,6) The intensity of basal plane texture is reduced by the improved rolling methods, and therefore, the stretch formability of the rolled Mg sheets is enhanced.…”

mentioning

confidence: 99%

Enhancement of Stretch Formability at Room Temperature by Addition of Ca in Mg-Zn Alloy

et al. 2010

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The stretch formability of a rolled Mg-1.5Zn-0.1Ca alloy sheet was investigated at room temperature. The Mg alloy showed a large Erichsen value of 8.2. This is due to a reduction in intensity of basal plane texture and a spreading of the basal poles towards the transverse direction. It is suggested that solid solution of Ca atoms into Mg plays a critical role in the unique texture formation. Activation of non-basal slips by dilute Ca addition was hypothesized to be related to the unique texture formation. [doi:10.2320/matertrans.M2009385] (Received November 18, 2009; Accepted January 18, 2010; Published March 3, 2010) Keywords: magnesium alloys, rolling, texture, stretch formability Magnesium alloys are promising structural light materials because of their high specific strength, high specific stiffness and so on. The use of Mg alloys is expanding, particularly in automobile industry and consumer electronics industry. For their greater applicability, high formability Mg alloy sheets should be developed. However, (0002) basal planes are aligned parallel to the rolling direction (RD) and the intense basal plane texture is formed during rolling, results in poor formability at room temperature in rolled Mg alloy sheets.Recently, Mg alloy sheets showing high stretch formability at room temperature have been developed through two means. One is improved rolling technologies such as differential speed rolling, 1-3) cross rolling 4) and high temperature rolling. 2,3,5,6) The intensity of basal plane texture is reduced by the improved rolling methods, and therefore, the stretch formability of the rolled Mg sheets is enhanced. Huang et al. 2) showed that a large Erichsen value of 9.5 is obtained in AZ31 Mg alloy produced by differential speed rolling at high temperature of 823 K. Addition of special elements such as Ce, Y, Gd and La is another route for enhancement of stretch formability at room temperature in Mg alloys. 7-9) For example, it has been reported that a rolled Mg-1.5 mass%Zn-0.2 mass%Ce alloy sheet shows a large Erichsen value of 9.0 at room temperature. 7) Addition of the special elements gives rise not only to a reduction in intensity of basal plane texture, but also to a spreading of the basal poles towards the RD or the transverse direction (TD). [8][9][10][11][12][13][14] Such unique texture by the addition of special elements is obtained during extruding as well. [15][16][17][18] However, these additional elements are rare and high cost materials. This is a big problem for commercial applications.The present paper describes enhancement of stretch formability at room temperature by very low Ca addition of 0.066 mass% to Mg-1.52 mass%Zn alloy. The rolled Mg-ZnCa alloy exhibited a large Erichsen value of 8.2 at room temperature, while a rolled Mg-Zn alloy showed a low Erichsen value of 3.4 at room temperature. This finding of the enhanced stretch formability by the Ca addition is very interesting in terms of both commercial and scientific aspects.An extruded Mg-1.52 mass%Zn-0.066 mass%Ca alloy (Mg-1.5Z...

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Textures and stretch formability of Mg–6Al–1Zn magnesium alloy sheets rolled at high temperatures up to 793 K

Cited by 156 publications

References 12 publications

Mechanical Properties and Structure Evolution of the Az91 Magnesium Alloy After Hot Rolling and Annealing

Mechanical Properties and Structure Evolution of the Az91 Magnesium Alloy After Hot Rolling and Annealing

Microstructures and Texture Development of the Cross-Roll Rolled AZ31 Alloy Sheet at High Temperature

Enhancement of Stretch Formability at Room Temperature by Addition of Ca in Mg-Zn Alloy

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