Simultaneous improvements in strength and formability of modified Mg–2Zn alloys by alloying addition and twin-roll casting process

Zhang, Yun; Jiang, Haitao; Wang, Shihong; Wang, Yujiao; Tian, Shiwei; Lin, Hongtao; Xu, Zhe

doi:10.1016/j.msea.2020.140566

Cited by 10 publications

(6 citation statements)

References 97 publications

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“…The alloy was henceforth denoted as TRC-ZA21 based on the content of main alloying elements and casting process. Moreover, as compared to the annealed ZA21 alloy sheets cast by traditional casting process, annealed TRC-ZA21 alloy sheet exhibited higher mechanical properties and higher formability [34]. The yield strength along RD of TRC-ZA21 alloy increased by 19.4% and reached 201.2 MPa.…”

Section: Methodsmentioning

confidence: 90%

“…The related chemical composition of typical particles contained Al, Ca, Gd, Mn elements. Previous investigation demonstrated that these particles belonged to Al-Mn series phase [34]. The occurrence of Ca and Gd elements in Al-Mn series phase was related to the interaction of RE or Ca element with Al and Mn element, which can be seen in some magnesium alloy studies [37,38].…”

Section: Microstructure Evolution During Tensile Deformation Processmentioning

confidence: 85%

“…The annealed alloy sheet was fabricated by TRC process, multi-passes hot rolling process and annealing treatment. The detailed fabrication process of the annealed TRC-ZA21 alloy sheet with 1 mm in thickness can be found in our previous study [34,35]. The alloy was henceforth denoted as TRC-ZA21 based on the content of main alloying elements and casting process.…”

Section: Methodsmentioning

confidence: 99%

“…The influences of strain rate and loading direction are worth revealing the mechanism of texture and CRSS of various deformation mechanisms on microstructure evolution in magnesium alloy containing RE/Ca elements with weakened basal texture. A new TRC-ZA21 magnesium alloy sheet with excellent balance between strength and formability was designed with low contents of Ca and Gd additions and fabricated by twin-roll casting (TRC) and hot rolling [34]. The magnesium alloy sheet exhibited evidently weakened basal texture and significant anisotropy of mechanical property in rolled plane [35].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Evolution during Tensile Deformation in TRC-ZA21 Magnesium Alloy with Different Loading Directions and Strain Rates

Zhang

Jiang

Sun

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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The variation of texture characteristics and activation of deformation mechanism in magnesium alloys can be achieved by addition of RE and Ca elements and subsequently affect the microstructure evolution during deformation process. In this manuscript, the effects of loading direction and strain rate on mechanical properties, microstructural characteristics, texture evolution and deformation mechanism in TRC-ZA21 magnesium alloy sheet were investigated. Moreover, orientation dependence and strain rate sensitivity of deformation mechanism were also discussed. The results showed that evident difference in mechanical properties in TRC-ZA21 alloy exhibited by the changes in loading direction and strain rate. The variations in grain orientation and basal texture characteristic were attributed to the grain rotation behavior during the plastic deformation, dominated by deformation mechanism. Basal slip, extension twinning and prismatic slip played different contributions to plastic deformation behavior and presented orientation dependence and strain rate sensitivity. The activities of prismatic slip and extension twinning both enhance with increasing strain rate. The phenomenon of weakened effect of twinning and promoted role of prismatic slip was presented to coordinate strain compatibility during plastic deformation.

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Section: Methodsmentioning

confidence: 90%

Section: Microstructure Evolution During Tensile Deformation Processmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructural Evolution during Tensile Deformation in TRC-ZA21 Magnesium Alloy with Different Loading Directions and Strain Rates

Zhang

Jiang

Sun

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…The strengthening mechanism and the Portevin-Le Chatelier effect at room temperature are two interesting topics in some alloys. On the one hand, a strengthening mechanism was investigated in some magnesium alloys [ 14 , 15 , 16 ], and some recent relevant reports were documented [ 17 , 18 , 19 , 20 ]. Research on the strengthening mechanism is developing towards the quantification of individual strengthening mechanisms and elucidation from atomic mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Strengthening, Portevin-Le Chatelier Effect, High-Temperature Tensile Deformation Behavior, and Constitutive Modeling in a Lightweight Mg-Gd-Al-Zn Alloy

Cao

Guo

et al. 2023

Materials

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To explore room-temperature strengthening and high-temperature ductility, a lightweight novel Mg-1.85Gd-0.64Al-0.62Zn alloy was fabricated by innovative multidirectional forging and a hot-rolling technique. Microstructures and mechanical properties were studied at room and elevated temperatures with an optical microscope, an X-ray diffractometer, and a tensile tester. An ultimate tensile strength of 260 MPa, yield strength of 171 MPa, and elongation of 20.4% were demonstrated at room temperature. The room-temperature strengthening mechanisms were identified by strengthening the model estimation. A type C Portevin-Le Chatelier effect was discovered and elucidated in this alloy. X-ray diffraction analysis revealed that the phase composition is α-Mg solid solution and (Mg, Al)3Gd, Al7Zn3, and Al2Gd intermetallic compounds. Examination of the microstructure at elevated temperatures revealed that dynamic recrystallization and dynamic grain growth occur. In particular, it was discovered that bimodal microstructures or incomplete dynamic recrystallization microstructures exist in high-temperature deformation. A maximum quasi-superplasticity of 228.4% was demonstrated in this alloy at 673 K and 5.0 × 10−4 s−1. Flow stress curves showed that the present alloy exhibits Sotoudeh–Bate curves or a long intermediate strain-hardening stage followed by a strain-softening stage. A modified Zerilli–Armstrong constitutive equation incorporating the number of dislocations was established. The power-law constitutive equation was established to identify the deformation mechanism. Both constitutive models had good predictability. At 673 K and 5.0 × 10−4 s−1, the stress exponent was 4, and the average deformation activation energy was 104.42 kJ/mol. The number of dislocations inside a grain was 146. This characteristic evidence confirmed that dislocation motion controlled by pipe diffusion dominates the rate-controlling process under this condition.

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Tailoring the Texture and Mechanical Anisotropy of Multi-cross Rolled Mg–Zn–Gd Alloy by Annealing

Yan

Chen

2022

Acta Metall. Sin. (Engl. Lett.)

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The unidirectional rolled Mg-Zn-Gd sheet usually exhibited non-basal texture with two peaks whose tilting angle were about 42° from normal direction to transverse direction (TD), which would cause the mechanical anisotropy. In this study, multi-cross rolling followed by annealing was used to tailor the texture and mechanical anisotropy for Mg-Zn-Gd alloy. With increasing annealing temperature, the rolled basal texture with two peaks gradually transformed into the circle texture with multi-peaks. In order to figure out different texture components evolution during annealing, the basal texture, R-texture and T-texture component were defined and studied. The results showed that the change of R-texture and T-texture component was asynchronous with increasing annealing temperature from 250 to 400 °C. The tilting angle of R-texture component increased slightly, while the tilting angle of T-texture component increased obviously, and this phenomenon was attributed to the preferential nucleation at grain nucleation stage rather than preferential grain growth. The yield strength along TD was more sensitive to annealing temperature compared with that along rolling direction (RD), resulting in different descending slopes and yield strength anisotropy with increasing annealing temperature. Annealing at 300 °C was the best annealing temperature due to low yield strength anisotropy, moderate strength and good elongation among these annealing temperatures. The Schmid factor for basal slip indicated that the activity of basal slip along RD increased slightly, while that along TD increased obviously with increasing annealing temperature from 250 to 400 °C, which should be caused by the asynchronous change of R-texture component and T-texture component, consequently resulting in the transformation from isotropic yield strength to anisotropic yield strength.

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Simultaneous improvements in strength and formability of modified Mg–2Zn alloys by alloying addition and twin-roll casting process

Cited by 10 publications

References 97 publications

Microstructural Evolution during Tensile Deformation in TRC-ZA21 Magnesium Alloy with Different Loading Directions and Strain Rates

Microstructural Evolution during Tensile Deformation in TRC-ZA21 Magnesium Alloy with Different Loading Directions and Strain Rates

Room-Temperature Strengthening, Portevin-Le Chatelier Effect, High-Temperature Tensile Deformation Behavior, and Constitutive Modeling in a Lightweight Mg-Gd-Al-Zn Alloy

Tailoring the Texture and Mechanical Anisotropy of Multi-cross Rolled Mg–Zn–Gd Alloy by Annealing

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