Effect of rare earth additions on microstructure and texture development of magnesium alloy sheets

Hantzsche, Kerstin; Bohlen, Jan; Wendt, Joachim; Kainer, Karl Ulrich; Yi, Sangbong; Letzig, Dietmar

doi:10.1016/j.scriptamat.2009.12.033

Cited by 673 publications

(269 citation statements)

References 7 publications

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“…[18] However, this transition was not associated with precipitation, since in all cases the critical RE concentration required to produce the texture weakening effect was below the expected bulk solid solubility. [15,18] The role of shear bands in forming the RE texture component on recrystallization has been noted in several studies, with the RE textured grains in binary Mg-RE extrusions clearly resulting from preferential recrystallization in shear bands. [8] More recent work has revealed that the distribution of regions of strain localisation (shear bands or deformation bands) is influenced directly by RE additions.…”

Section: Understanding the Rare-earth Effect: Backgroundmentioning

confidence: 95%

“…[16,17] Once a critical level of RE is achieved, further texture weakening does not occur with more RE addition. [18] It was also shown that the potency of an element in weakening the strong basal texture scales inversely with the solubility of the element; i.e., for elements with a higher solubility, more RE is needed to produce a texture change. [18] However, this transition was not associated with precipitation, since in all cases the critical RE concentration required to produce the texture weakening effect was below the expected bulk solid solubility.…”

Section: Understanding the Rare-earth Effect: Backgroundmentioning

confidence: 99%

“…[18] It was also shown that the potency of an element in weakening the strong basal texture scales inversely with the solubility of the element; i.e., for elements with a higher solubility, more RE is needed to produce a texture change. [18] However, this transition was not associated with precipitation, since in all cases the critical RE concentration required to produce the texture weakening effect was below the expected bulk solid solubility. [15,18] The role of shear bands in forming the RE texture component on recrystallization has been noted in several studies, with the RE textured grains in binary Mg-RE extrusions clearly resulting from preferential recrystallization in shear bands.…”

Section: Understanding the Rare-earth Effect: Backgroundmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

Robson

2013

Metall Mater Trans A

188

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Magnesium alloys that contain certain rare-earth (RE) additions are known to have improved formability and this can be partly attributed to the different texture they display after recrystallization. Previous experimental work has identified segregation of RE to grain boundaries and dislocations as being potentially important in producing this change in behavior. In the present paper, two classical models (Langmuir-McClean and Cahn-Lu¨cke-Stu¨we) are used to explore the likely effect of RE additions on grain boundary solute concentration and drag. It is demonstrated that a wide range of RE elements are predicted to segregate strongly to grain boundaries due to the large atomic size misfit with magnesium. The maximum level of segregation is produced for elements such as Y or Gd that combine a high misfit and high bulk solubility. Segregated Y is predicted to produce a solute drag pressure on migrating boundaries several orders of magnitude greater than that obtained by Al or Zn additions. It is demonstrated that while this drag is predicted to be insufficient to strongly retard static recrystallization under typical annealing conditions, it is expected to suppress dynamic recrystallization by any mechanism requiring boundary migration.

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Section: Understanding the Rare-earth Effect: Backgroundmentioning

confidence: 95%

Section: Understanding the Rare-earth Effect: Backgroundmentioning

confidence: 99%

Section: Understanding the Rare-earth Effect: Backgroundmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

Robson

2013

Metall Mater Trans A

188

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“…[2,3] Although there has been considerable progress in understanding the role that RE plays in producing this enhancement, a complete explanation for all the observed effects remains elusive. This is partly because RE additions have a complex influence on several microstructural mechanisms that ultimately control formability, and it is a combination of these effects that appears to give the desirable macroscopic behavior.…”

Section: Introductionmentioning

confidence: 99%

“…RE textures in rolled Mg-RE binary alloys are best described as weak deformation textures. [2] In rolled sheet, such textures are usually characterized by a spread or split in basal poles toward the rolling direction (RD). This type of texture is seen in both RE and non-RE containing rolled sheet, the effect of RE being to weaken the texture but to retain an RD spread in basal poles.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Strain Path on Rare Earth Recrystallization Textures in a Magnesium-Zinc-Rare Earth Alloy

Griffiths

Davis²,

Robson

2017

Metall Mater Trans A

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In this study, the effect of strain path on texture evolution during cold rolled and annealing of hot rolled Mg-Zn-Rare-Earth (RE) alloy (ZEK100) sheet has been investigated. Strain path during cold rolling has been varied by changing rolling direction with respect to the original hot rolling (HR) direction of the sheet. Cold rolling either parallel or perpendicular to the HR direction leads to spread and split of basal poles in the transverse direction (TD) during annealing, characteristic of Mg-Zn-RE alloys. However, when the sheet is continuously rotated between cold rolling passes, this texture spread is not produced. It is demonstrated that a change in dislocation activity, as predicted by crystal plasticity modeling, cannot explain the unusual textures developed in Mg-Zn-RE alloys. Instead, the role of strain path in determining shear band evolution is considered to be critical. When shear bands are suppressed by continuously rotating the specimen, the distinct Zn-RE texture is not produced. Furthermore, it is demonstrated the dominance of the TD spread grains emerges gradually during recrystallization, leading to the final observed texture.

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Texture Weakening Effect of Y in Mg‐Zn‐Y System

Farzadfar¹,

Sanjari²,

Jung³

et al. 2011

Magnesium Technology 2011

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Effect of rare earth additions on microstructure and texture development of magnesium alloy sheets

Cited by 673 publications

References 7 publications

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

The Influence of Strain Path on Rare Earth Recrystallization Textures in a Magnesium-Zinc-Rare Earth Alloy

Texture Weakening Effect of Y in Mg‐Zn‐Y System

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