Theoretical study on the{1¯012}deformation twinning and cracking in coarse-grained magnesium alloys

The present paper examines the development of grain size during the recrystallization of magnesium alloys and the influence the grain size has on the mechanical response. In magnesium alloys grain refinement improves the strength-ductility balance. This simultaneous increase in both strength and ductility is ascribed to the impact the grain size has on deformation twinning. The mechanisms by which the grain size is established during hot working are shown to be conventional dynamic recrystallization followed by post-dynamic recrystallization. The role of alloying addition on both of these reactions is briefly considered.

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Deformation twinning with zero macroscopic strain in a coarse-grained Ni–Co-based superalloy

Scripta Materialia ◽

10.1016/j.scriptamat.2014.01.030 ◽

2014 ◽

Vol 77 ◽

pp. 71-74 ◽

Cited By ~ 12

Author(s):

Y.J. Xu ◽

K. Du ◽

C.Y. Cui ◽

H.Q. Ye

Keyword(s):

Deformation Twinning ◽

Coarse Grained ◽

Macroscopic Strain

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Twinning Behavior in Magnesium Alloys Processed by Laser Shock Peening

Volume 2: Processes; Materials ◽

10.1115/msec2019-2850 ◽

2019 ◽

Author(s):

Bo Mao ◽

Yiliang Liao ◽

Bin Li

Keyword(s):

Mechanical Properties ◽

Magnesium Alloys ◽

Microstructure Evolution ◽

Laser Intensity ◽

Deformation Twinning ◽

Mg Alloys ◽

Laser Shock Peening ◽

Surface Microstructure ◽

Laser Shock ◽

Shock Peening

Abstract In this paper, the surface microstructure evolution of an AZ31B magnesium (Mg) alloy during laser shock peening (LSP) was investigated. Particular attention was paid to the deformation twinning behavior, which plays an important role in the mechanical properties of Mg alloys. The effect of laser intensity on the twinning distribution was investigated. Twin-twin interactions during LSP process were characterized. The mechanism responsible for the formation of gradient twinning microstructure and twinning-induced hardening effect were discussed.

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Changes in Mechanical and Microstructural Properties of Magnesium Alloys Resulting from Superimposed High Current Density Pulses

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1016.385 ◽

2021 ◽

Vol 1016 ◽

pp. 385-391

Author(s):

Eugen Demler ◽

Alexander Diedrich ◽

Andrej Dalinger ◽

Gregory Gerstein ◽

Sebastian Herbst ◽

...

Keyword(s):

Magnesium Alloys ◽

Current Density ◽

High Current Density ◽

Sheet Material ◽

Compressive Load ◽

Underlying Mechanism ◽

Coarse Grained ◽

High Current ◽

Mechanical And Microstructural Properties ◽

The Impact

Magnesium alloys are important engineering materials due to their good combination of strength and very low densities. However, the low ductility imposed by the hcp-lattice has thus far limited the application of magnesium alloys as sheet material. The use of the electroplastic effect offers a route to increase formability of magnesium alloys while being more energy efficient than conventional hot forming. The underlying mechanism (s) of this effect have not yet been fully understood. This study investigates the impact of high current density electrical pulses on magnesium alloys. Special consideration was given to the effect of the orientation of the applied electric current relative to the mechanical loading of the specimens. The results show that the mechanical properties of coarse-grained materials are more strongly affected by the current pulses than finer grained material. Applying the current parallel to the compressive load shows a more pronounced softening of the material than pulses applied perpendicular to the mechanical stress. Microstructure investigations revealed the formation of twinning solely in the interior of grains even at stresses below the yield point for both configurations.

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Saturation of Deformation Twinning in Magnesium Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.879.2084 ◽

2016 ◽

Vol 879 ◽

pp. 2084-2087 ◽

Cited By ~ 1

Author(s):

Wen Wen Wei ◽

Erwin Povoden-Karadeniz ◽

Ernst Kozeschnik

Keyword(s):

Physical Model ◽

Magnesium Alloys ◽

Deformation Twinning ◽

Mg Alloy ◽

Alloy Az31 ◽

The Mean ◽

Twin Growth

The saturation of primary tensile twins in heavily textured Mg-alloy AZ31 is investigated, and their strain accommodation limit is evaluated. EBSD results suggest that the mean number of twins per grain saturate rapidly, followed by the stop of twin growth. Twinning saturation is included in a physical model of twin evolution.

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