Great room temperature stretch formability of fine-grained Mg-Mn alloy

Somekawa, Hidetoshi; Kinoshita, Akihito; Kato, Akira

doi:10.1016/j.msea.2017.05.012

Cited by 48 publications

(15 citation statements)

References 49 publications

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“…Ca results are consistent with moderate ductility at 0.036 and 0.3 at % Ca in largegrain-size alloys (200 to 400 mm) (17,18) and with the observed DPRD texture (19). For Mn, the ductility condition is reached at c ≈ 0.3 at %, in agreement with observed ductility and formability at 0.35 at % and 18-mm grain size (20). For Zn and Ag, c < 0 at all concentrations, so these solutes are not predicted to create favorable conditions for ductility or for DPRD texture, consistent with experiments (19).…”

supporting

confidence: 86%

Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Ahmad

Yin

et al. 2018

Science

492

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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supporting

confidence: 86%

Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Ahmad

Yin

et al. 2018

Science

492

103

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“…Extrusions of Mg-0.83wt pct Mn alloy exhibited super-formability at room temperature when they had fine grains. [281] After extrusion at 150°C with an extrusion ratio of 32:1, the alloy plate had fully recrystallized grains with an average grain size of 2.5 lm and a strong basal texture. Under an extraordinarily low forming rate, 10 À5 mm s À1 , at room temperature, the formability of the plate [281] was as good as that of aluminum alloy 5083.…”

Section: Mg-mn-based Alloysmentioning

confidence: 98%

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Nie

Shin

Zeng

2020

Metall Mater Trans A

145

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Pure magnesium (Mg) develops a strong basal texture after conventional processing of hot rolling or extrusion. Consequently, it exhibits anisotropic mechanical properties and is difficult to form at room temperature. Adding appropriate alloying elements can weaken the basal texture or even change it, but the improvement in formability and mechanical properties is still far from expectations. Over the past 20 years, considerable efforts have been made and significant progress has been made on wrought Mg alloys at the fundamental and technological levels. At the fundamental level, textures formed in sheets and extrusions of different alloy compositions and produced under different strain paths or thermomechanical processing conditions are relatively well established, with the assistance of the advanced characterization technique of electron backscatter diffraction. At the technological level, room temperature formability of sheet has been significantly improved, and tension-compression yield asymmetry of extrusion is also remarkably reduced or eliminated. This paper starts with an overview of dislocations, stacking faults and twins, and deformation of single crystals of pure Mg along different orientations and under different loading conditions, followed by a review of microstructure (texture and grain size) and deformation of polycrystalline pure Mg with different textures, grain sizes, and loading conditions. With this information as a base, texture, grain size, and deformation of polycrystalline Mg alloy sheets and extrusions produced under different processing conditions are systematically examined and compared. Remaining and emerging scientific and technology issues are then highlighted and discussed in the context of texture and grain size. The need for better-resolution diffraction and spectroscopy techniques is also discussed in the relationship between texture change and grain boundary solute segregation.

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“…lean alloy) Mg alloys. The enhancement in ductility and formability made by this approach is so significant that samples exhibit a total elongation of more than 100% or nearly infinite compressive formability [16][17][18][19][20][21][22][23]. These findings provide a new approach for designing and developing highly formable products from Mg and its dilute alloys.…”

Section: Introductionmentioning

confidence: 88%

Deformation modes during room temperature tension of fine-grained pure magnesium

et al. 2021

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Great room temperature stretch formability of fine-grained Mg-Mn alloy

Cited by 48 publications

References 49 publications

Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Deformation modes during room temperature tension of fine-grained pure magnesium

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