Journal ArticleDOI
The influence of temperature on twinning behavior of a Mg-Gd-Y alloy during hot compression
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In this article, the microstructure evolution and plastic deformation mechanism of Mg-6.58Gd-5.55Zr alloy were investigated by uniaxial compression at temperatures ranging from 300°C to 450°C and with an initial strain rate of 0.1Abstract:
The microstructure evolution and plastic deformation mechanism of Mg-6.58Gd-5.7Y-0.55Zr alloy were investigated by uniaxial compression at temperatures ranging from 300 °C to 450 °C and with an initial strain rate of 0.1 s−1, and characterized by optical microscope (OM), scanning electron microscope (SEM) and electron back-scattering diffraction (EBSD). The effect of temperature on twinning behavior was focused in detail. At relatively low temperature, such as 300 °C, multiple twin variant pairs can be activated in one grain, and the twining process was dominated by nucleation. However, at high temperature, most of the twins activated in one grain belong to the single twin variant pair with the highest Schmid Factor (SF), and twin growth seems to represent the twinning behavior at 450 °C. The twinning behavior of Mg-6.58Gd-5.7Y-0.55Zr alloy at temperatures ranging from 300 °C to 450 °C basically follows Schmid law, and can be well understood in terms of variation of stress state and activated deformation modes with compression temperature.read more
Citations
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Journal ArticleDOI
Reasonable utilization of {10-12} twin for optimizing microstructure and improving mechanical property in a Mg-Gd-Y alloy
TL;DR: Wang et al. as mentioned in this paper proposed a yield isotropy high-strength Mg alloy with an ultimate tensile strength of 354 MPa after multi-directional impact forging (MDIF) of 110 passes.
Journal ArticleDOI
The effect of twinning on dynamic recrystallization behavior of Mg-Gd-Y alloy during hot compression
TL;DR: In this article, the effects of twinning on the dynamic recrystallization (DRX) of the Mg-6.58Gd-5.7Y-0.55Zr alloy were investigated through uniaxial compression tests at 400 and 450°C with an initial strain rate of 0.001 and 0.1 s −1.
Journal ArticleDOI
Effects of precipitate type on twin/slip activity in ZK60 alloys and yield asymmetry
TL;DR: In this paper, the strengthening effects of different precipitates in ZK60 alloys on prismatic slip and extension twinning were studied by experimental work and Visco-Plastic Self Consistent (VPSC) modeling.
Journal ArticleDOI
Microstructure and mechanical properties of large-scale Mg-Gd-Y-Zn-Mn alloys prepared through semi-continuous casting
Kui Wang,Jingfeng Wang,Xiaoxu Dou,Yuanding Huang,Norbert Hort,Sarkis Gavras,Shijie Liu,Yanwu Cai,Jinxing Wang,Fusheng Pan +9 more
TL;DR: In this article, a large-scale Mg-8Gd-4Y-1Zn-Mn (wt.%) alloy ingot with a diameter of 315 mm and a length of 2410 mm was prepared through semi-continuous casting.
Journal ArticleDOI
Microstructure and texture optimization by static recrystallization originating from {10-12} extension twins in a Mg-Gd-Y alloy
TL;DR: In this paper, the effect of {10-12} extension twin on SRX behavior has been investigated by annealing treatment at 450 °C using optical microscopy (OM) and quasi-in-situ electron back-scattering diffraction (EBSD).
References
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Journal ArticleDOI
Twinning and the ductility of magnesium alloys Part I: “Tension” twins
TL;DR: In this article, a series of tensile test results are reported for the common wrought alloy AZ31 and a simple constitutive model is employed to argue that View the MathML source twinning (which gives extension along the c-axis) can increase the uniform elongation in tensile tests.
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Twinning and the ductility of magnesium alloys: Part II. “Contraction” twins
TL;DR: In this paper, a series of tensile and compression tests results are reported for common wrought alloys: AZ31, ZK60 and ZM20, and these data are combined with EBSD analysis and simple flow stress models to argue the following: (i) contraction double twinning (which enables contraction along the c axis) can decrease the uniform elongation, and (ii) compression double twinening can also account for shear failure at low strains.
Journal ArticleDOI
Role of {10–12} twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy
TL;DR: In this paper, the activation of specific twin variants depending on the strain path induced a significant difference in twinning characteristics, such as twin morphology, volume fraction of twins with strain, and twin texture, and consequently gave rise to a totally different effect on the deformation.
Journal ArticleDOI
Modeling the temperature dependent effect of twinning on the behavior of magnesium alloy AZ31B sheet
A. Jain,Sean R. Agnew +1 more
TL;DR: In this paper, the critical resolved shear strengths (CRSS) and hardening behaviors of deformation mechanisms were modelled using a viscoplastic self-consistent polycrystal model to model the changes in the flow stress profile, the strain anisotropy, and texture evolution.
Journal ArticleDOI
Sensitivity of deformation twinning to grain size in titanium and magnesium
Alireza Ghaderi,Matthew Barnett +1 more
TL;DR: In this article, the impact of grain size on deformation twinning in commercial purity titanium and magnesium alloy Mg-3Al-1Zn (AZ31) was investigated.