Texture and microstructure development during hot deformation of ME20 magnesium alloy: Experiments and simulations

Li, X.; Al‐Samman, Talal; Mu, Sijia; Gottstein, Günter

doi:10.1016/j.msea.2011.07.010

Cited by 59 publications

(46 citation statements)

References 20 publications

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“…In agreement with previous publications, the coarse precipitates which are observed in the ME21 alloy are dominated by the Mg 12 Ce phase. [15,16] Additionally, finer Mn containing precipitates of an equivalent diameter of 100 to 300 nm were observed. The precipitate density is considerably lower in case of the WE54 alloys.…”

Section: A Microstructure and Texture Developmentmentioning

confidence: 97%

Analysis of the Deformation Behavior of Magnesium-Rare Earth Alloys Mg-2 pct Mn-1 pct Rare Earth and Mg-5 pct Y-4 pct Rare Earth by In Situ Energy-Dispersive X-ray Synchrotron Diffraction and Elasto-Plastic Self-Consistent Modeling

Lentz

Klaus

Coelho

et al. 2014

Metall Mater Trans A

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The deformation behavior of the Mg-RE alloys ME21 and WE54 was investigated. Although both alloys contain rare earth elements, which alter and weaken the texture, the flow curves of the alloys deviate significantly, especially in uniaxial compression test. Apart from the higher strength of the WE54 alloy, the compression flow curve does not exhibit the typical sigmoidal shape, which is associated with tension twinning. However, optical microscopy, X-ray texture measurements, and EBSD analysis reveal the activity of tension twinning. The combination of in situ energy-dispersive X-ray synchrotron diffraction and EPSC modeling was used to analyze these differences. The investigation reveals that twin propagation is decelerated in the WE54 alloy, which requires a change of the twinning scheme from the 'finite initial fraction' to the 'continuity' assumption. Furthermore, an enhanced activity of the hc+ai pyramidal slip system was observed in case of the WE54 alloy.

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Section: A Microstructure and Texture Developmentmentioning

confidence: 97%

Analysis of the Deformation Behavior of Magnesium-Rare Earth Alloys Mg-2 pct Mn-1 pct Rare Earth and Mg-5 pct Y-4 pct Rare Earth by In Situ Energy-Dispersive X-ray Synchrotron Diffraction and Elasto-Plastic Self-Consistent Modeling

Lentz

Klaus

Coelho

et al. 2014

Metall Mater Trans A

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“…One appealing approach of achieving this goal is via alloy composition adjustment, e.g., addition of rare-earth (RE) elements into Mg alloys. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] These RE-Mg alloys possess quite random initial crystallographic texture which leads to improved ductility and strength at both room and elevated temperatures via solid solution strengthening and precipitation strengthening. [31,32] It was reported that an RE element alternates the bonding energy between the Mg atom and the RE atom, thus increasing the possibility of non-basal slip and inhibiting the basal slip and f1012g twinning.…”

Section: Introductionmentioning

confidence: 99%

“…[32] In other words, RE elements such as Gd, Nd, Ce, and La can work as effective texture modifiers for Mg alloys, and they are able to produce the so-called ''RE texture component'' even at low alloying levels. [18][19][20]23,26,27,33] Recent studies reported that due to certain RE concentrations and extrusion parameters there was a shift in the orientation peak of the extrusion textures in the REcontaining alloys from h10À10i to new positions of h11À21i, h11À22i or h20À21i parallel to extrusion direction, which were termed as ''RE texture component''. [19,20,33] The components were well oriented for basal slip when tested in the appropriate orientation (where it is difficult to deform, resulting in high flow stresses, and modest work hardening [34] ), which results in a considerable gain of ductility and a reduction of the tension-compression asymmetry present in the conventional wrought Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Mirza

Chen

et al. 2014

Metall Mater Trans A

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The present study was aimed at evaluating strain-controlled cyclic deformation behavior of a rareearth (RE) element containing Mg-10Gd-3Y-0.5Zr (GW103K) alloy in different states (as-extruded, peak-aged (T5), and solution-treated and peak-aged (T6)). The addition of RE elements led to an effective grain refinement and weak texture in the as-extruded alloy. While heat treatment resulted in a grain growth modestly in the T5 state and significantly in the T6 state, a high density of nano-sized and bamboo-leaf/plate-shaped b¢ (Mg 7 (Gd,Y)) precipitates was observed to distribute uniformly in the a-Mg matrix. The yield strength and ultimate tensile strength, as well as the maximum and minimum peak stresses during cyclic deformation in the T5 and T6 states were significantly higher than those in the as-extruded state. Unlike RE-free extruded Mg alloys, symmetrical hysteresis loops in tension and compression and cyclic stabilization were present in the GW103K alloy in different states. The fatigue life of this alloy in the three conditions, which could be well described by the Coffin-Manson law and Basquin's equation, was equivalent within the experimental scatter and was longer than that of RE-free extruded Mg alloys. This was predominantly attributed to the presence of the relatively weak texture and the suppression of twinning activities stemming from the fine grain sizes and especially RE-containing b¢ precipitates. Fatigue crack was observed to initiate from the specimen surface in all the three alloy states and the initiation site contained some cleavage-like facets after T6 heat treatment. Crack propagation was characterized mainly by the characteristic fatigue striations.

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“…al. [22] who related it with improved formability. They reported that the deformation was carried out primarily by basal slip assisted by prismatic and <c + a> pyramidal slip.…”

Section: Methodsmentioning

confidence: 99%

Multi-passes warm rolling of AZ31 magnesium alloy, effect on evaluation of texture, microstructure, grain size and hardness

Kamran

Hasan

Tariq

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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Multi-passes warm rolling of AZ31 magnesium alloy, effect on evaluation of texture, microstructure, grain size and hardness Abstract. In this study the effect of multi-passes warm rolling of AZ31 magnesium alloy on texture, microstructure, grain size variation and hardness of as cast sample (A) and two rolled samples (B & C) taken from different locations of the as-cast ingot was investigated. The purpose was to enhance the formability of AZ31 alloy in order to help manufacturability. It was observed that multi-passes warm rolling (250°C to 350°C) of samples B & C with initial thickness 7.76mm and 7.73 mm was successfully achieved up to 85% reduction without any edge or surface cracks in ten steps with a total of 26 passes. The step numbers 1 to 4 consist of 5, 2, 11 and 3 passes respectively, the remaining steps 5 to 10 were single pass rolls. In each discrete step a fixed roll gap is used in a way that true strain per step increases very slowly from 0.0067 in the first step to 0.7118 in the 26th step. Both samples B & C showed very similar behavior after 26th pass and were successfully rolled up to 85% thickness reduction. However, during 10 th step (27 th pass) with a true strain value of 0.772 the sample B experienced very severe surface as well as edge cracks. Sample C was therefore not rolled for the 10th step and retained after 26 passes. Both samples were studied in terms of their basal texture, microstructure, grain size and hardness. Sample C showed an equiaxed grain structure after 85% total reduction. The equiaxed grain structure of sample C may be due to the effective involvement of dynamic recrystallization (DRX) which led to formation of these grains with relatively low misorientations with respect to the parent as cast grains. The sample B on the other hand showed a microstructure in which all the grains were elongated along the rolling direction (RD) after 90 % total reduction and DRX could not effectively play its role due to heavy strain and lack of plastic deformation systems. The microstructure of as cast sample showed a near-random texture (mrd 4.3), with average grain size of 44 µm & micro-hardness of 52 Hv. The grain size of sample B and C was 14µm and 27µm respectively and mrd intensity of basal texture was 5.34 and 5.46 respectively. The hardness of sample B and C came out to be 91 and 66 Hv respectively due to reduction in grain size and followed the well known Hall-Petch relationship.

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Texture and microstructure development during hot deformation of ME20 magnesium alloy: Experiments and simulations

Cited by 59 publications

References 20 publications

Analysis of the Deformation Behavior of Magnesium-Rare Earth Alloys Mg-2 pct Mn-1 pct Rare Earth and Mg-5 pct Y-4 pct Rare Earth by In Situ Energy-Dispersive X-ray Synchrotron Diffraction and Elasto-Plastic Self-Consistent Modeling

Analysis of the Deformation Behavior of Magnesium-Rare Earth Alloys Mg-2 pct Mn-1 pct Rare Earth and Mg-5 pct Y-4 pct Rare Earth by In Situ Energy-Dispersive X-ray Synchrotron Diffraction and Elasto-Plastic Self-Consistent Modeling

Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Multi-passes warm rolling of AZ31 magnesium alloy, effect on evaluation of texture, microstructure, grain size and hardness

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