Nucleation and preferential growth mechanism of recrystallization texture in high purity binary magnesium-rare earth alloys

Imandoust, Aidin; Barrett, Christopher D.; Oppedal, A.L.; Whittington, W.R.; Paudel, YubRaj; Kadiri, Haitham El

doi:10.1016/j.actamat.2017.07.038

Cited by 202 publications

(42 citation statements)

References 55 publications

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“…Enhanced hc þ ai slip can also create three-dimensional dislocation networks that drive recrystallization, refine grains, and help weaken texture. Not withstanding other mechanisms (7,8), solute-accelerated hc þ ai cross-slip and activity can create favorable conditions for high ductility, with ductility then limited by normal work-hardening mechanisms.…”

mentioning

confidence: 99%

Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Ahmad

Yin

et al. 2018

Science

510

103

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Pure magnesium exhibits poor ductility owing to pyramidal [Formula: see text] dislocation transformations to immobile structures, making this lowest-density structural metal unusable for many applications where it could enhance energy efficiency. We show why magnesium can be made ductile by specific dilute solute additions, which increase the [Formula: see text] cross-slip and multiplication rates to levels much faster than the deleterious [Formula: see text] transformation, enabling both favorable texture during processing and continued plastic straining during deformation. A quantitative theory establishes the conditions for ductility as a function of alloy composition in very good agreement with experiments on many existing magnesium alloys, and the solute-enhanced cross-slip mechanism is confirmed by transmission electron microscopy observations in magnesium-yttrium. The mechanistic theory can quickly screen for alloy compositions favoring conditions for high ductility and may help in the development of high-formability magnesium alloys.

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mentioning

confidence: 99%

Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Ahmad

Yin

et al. 2018

Science

510

103

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“…Secondly, the mold was heated by high temperature box resistance furnace in order to make the alloy smoothly fill the cavity during the casting process. Thirdly, the SG-3-10 type smelting furnace temperature was heated to 750°C and a mixture protective gas of SF 6 and Ar with a volume ratio of 99:1 was introduced into the crucible, and then the pure magnesium bulk was heated to complete melting. After removing the upper scum of the magnesium liquid, the Sn, Zn, and Al metal blocks were respectively added to the magnesium liquid successively.…”

Section: Fabricated Of Cast Mg-6sn-3al-1zn Alloymentioning

confidence: 99%

“…In recent years, many series of magnesium alloys have been reported. For example, magnesium alloys with different rare earth elements [6,7], magnesium alloys with different elements (such as Al, Zn, Sn, Mn, and Li) have exhibited excellent properties [8][9][10]. The mechanical properties of the magnesium alloys can be strengthened by plastic deformation processing such as extrusion or rolling [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of rolling deformation on microstructure and mechanical properties of Mg-6Sn-3Al-1Zn alloy

Wei

Zhang

Shi

et al. 2020

Mater. Res. Express

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The Mg-6Sn-3Al-1Zn alloys treated with the solid solution were induced 25%, 45%, 65% and 85% rolling deformation at 400°C, respectively. The microstructures of as-rolled magnesium alloys were analyzed by XRD, OM, SEM and TEM, the mechanical properties were also measured. The results revealed that the rolled Mg-6Sn-3Al-1Zn alloys were composed of α-Mg matrix phase and Mg 2 Sn second phase, Mg 2 Sn distributed at the grain boundaries and intra-grains. With the increasing of the rolling deformation, the volume fraction of Mg 2 Sn phase distributed at the grain boundaries firstly decreased and then stabilized, the average size of Mg 2 Sn phase firstly increased and then decreased, the Mg 2 Sn phase distributed inside the grains gradually transformed from a rod shape to a spherical shape, the volume fraction of the recrystallized grains gradually increased and the average size of the recrystallized grains early decreased and eventually almost unchanged. When the rolling deformation exceeded 25%, the value of tensile strength and Vickers hardness of the Mg-6Sn-3Al-1Zn alloys increased with the rolling deformation. However, when the rolling deformation exceeded 65%, the elongation of the magnesium alloys diminished, however, the strength of as-rolled magnesium alloys did not increase significantly when the amount of rolling deformation increased from 65% to 85%. The mechanical properties were the best when the amount of rolling deformation reached 65%. Meanwhile, the volume fraction and area of Mg 2 Sn phase distributed on the grain boundaries were 2.9%, 105.5 μm 2 , the volume fraction and average grain size of recrystallized grains were 87% and 2.2 μm, respectively. In addition, it was worth noting that the Mg 2 Sn phase distributed inside the grains was radically converted into a spherical shape, and the tensile strength, elongation, hardness of the alloy were 317 MPa, 13% and 77.52 HV, respectively.

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“…Based on the current application limitations of Mg alloys, most of the findings [11][12][13][14] have been focused on dynamic recrystallization at high temperatures, which is obviously different from the static recrystallization mechanism realized by heat treatment after severe cold deformation. To date, there have been some papers reporting the static recrystallization process of Mg and its alloys after severe cold drawing deformation [9,15,16].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Recrystallized Grain and Texture of Cold-Drawn Pure Mg Wire and Their Effect on Mechanical Properties

et al. 2020

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Static recrystallization plays a key role in the fabrication of thin Mg wires as well as the mechanical properties of the final wires. The effect of annealing parameters on the evolution of the microstructures, textures and mechanical properties of cold-drawn pure Mg wire was studied by means of optical microscopy (OM), electron backscatter diffraction (EBSD), a tensile test and a hardness test. This study shows that the mechanical properties of as-annealed pure thin Mg wire is affected not only by the average grain size, but also the uniformity of the recrystallization grains, including the uniformity of grain size and crystal orientation distribution (more random texture component). With increasing annealing temperature and time, the uniformity of recrystallization grain size first improved and then declined after obvious grain growth. At the same time, the randomness of the basal texture component declined with the development of recrystallization. Annealing at 300 °C for 30 min caused the most uniform grain size and orientation distribution in the microstructures, thus contributing to the best plasticity among all experimental wires. It is reasonable to conclude that more uniform and regular recrystallized grains and a more randomly distributed crystal orientation would be benefit for the mechanical properties of Mg wires.

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Nucleation and preferential growth mechanism of recrystallization texture in high purity binary magnesium-rare earth alloys

Cited by 202 publications

References 55 publications

Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Effect of rolling deformation on microstructure and mechanical properties of Mg-6Sn-3Al-1Zn alloy

Evolution of Recrystallized Grain and Texture of Cold-Drawn Pure Mg Wire and Their Effect on Mechanical Properties

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