Exceptional high-strain-rate superplasticity in Mg–Gd–Y–Zn–Zr alloy with long-period stacking ordered phase

Yang, Qiang; Xiao, B.L.; Zhang, Q.; Zheng, M.Y.; Ma, Z.Y.

doi:10.1016/j.scriptamat.2013.09.001

Cited by 70 publications

(21 citation statements)

References 25 publications

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“…Nevertheless, most of the investigations of the Mg-Gd alloys reported superplasticity after simple extrusion [5,6] or friction stir processing (FSP) [7][8][9] and the minimum grain sizes attained by these methods were of the order of 3 m [8]. This suggests that it may be advantageous to evaluate the occurrence of superplasticity in these alloys after processing using severe plastic deformation (SPD) processes where there is a capability of achieving an even greater level of grain refinement.…”

Section: Introductionmentioning

confidence: 99%

Superplasticity of a nano-grained Mg–Gd–Y–Zr alloy processed by high-pressure torsion

Alizadeh

Mahmudi

Ngan

et al. 2016

Materials Science and Engineering: A

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While most of the reports on Mg-Gd-Y-Zr alloys report superplasticity after extrusion or friction stir processing, it is important to investigate superplasticity in these alloys after other severe plastic deformation processes having greater grain refinement capability. Accordingly, superplasticity was studied in an Mg-9Gd-4Y-0.4Zr (GW94) alloy after different high-pressure torsion (HPT) conditions. The HPT was performed at room temperature under an applied pressure of 6.0 GPa for up to 16 turns. TEM microstructural characterization revealed that the grain size was reduced from an initial value of ~8.6 m in the extruded condition to ~95 ± 10 and ~85 ± 10 nm after 8 and 16 turns, respectively. A shear punch testing method was used for evaluation of superplasticity at 573, 623, 673 and 723 K. Maximum strain rate sensitivities of ~0.51 ± 0.05 and ~0.48 ± 0.05 were obtained at 623 K for the material processed through 16 and 8 turns, respectively. This strain rate sensitivity and an activation energy of ~100 ± 5 kJ mol -1 suggests the occurrence of grain boundary sliding in the superplastic region.

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Section: Introductionmentioning

confidence: 99%

Superplasticity of a nano-grained Mg–Gd–Y–Zr alloy processed by high-pressure torsion

Alizadeh

Mahmudi

Ngan

et al. 2016

Materials Science and Engineering: A

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“…2 and 4. FSP can significantly cause grain refinement, elimination of cast porosity, dissolution and breakup of coarse second phases, which play important roles in the mechanical behavior of metallic materials [28,29]. After FSP, microstructure of BM is modified into fine-grained α-Mg with small intermetallic phase particles distributed on the matrix.…”

Section: Microstructure Evolution Of Cast Mg-nd-y Alloy During Differmentioning

confidence: 99%

“…Researches on FSP of conventional magnesium alloys, such as AZ91 [12,22], ZK60 [23] and AZ31 [24], have been widely carried out, and it is found that FSP is effective for elimination of cast porosity, grain refinement and breakup of coarse second phases, resulting in significantly enhanced mechanical properties. Recently, FSP of Mg-RE alloys have drawn great interests [25][26][27][28][29]. Several kinds of Mg-RE alloys, including Mg-Gd-Y-Zr alloy [2,25,26], Mg-Y-RE alloy [27], Mg-Zn-Zr-Nd-Gd alloy [28] and Mg-Gd-Y-Zn-Zr alloy [29], have been treated by FSP for microstructure modification.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, FSP of Mg-RE alloys have drawn great interests [25][26][27][28][29]. Several kinds of Mg-RE alloys, including Mg-Gd-Y-Zr alloy [2,25,26], Mg-Y-RE alloy [27], Mg-Zn-Zr-Nd-Gd alloy [28] and Mg-Gd-Y-Zn-Zr alloy [29], have been treated by FSP for microstructure modification. The influence of FSP on the cast Mg-Gd-Y-Zr alloy was investigated systematically, and the mechanical properties were improved due to grain refinement, with the maximum superplasticity of 1110% at 1×10 -3 s -1 and a medium temperature of 415 ℃ [25,26].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure evolution and mechanical properties of Mg–Nd–Y alloy in different friction stir processing conditions

Cao

Zhang

et al. 2015

Journal of Alloys and Compounds

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“…Accordingly, there are many investigations reporting superplasticity in fine grained Mg-Gd alloys with average grain sizes in the range of 1-10 m processed by extrusion [15][16][17][18], friction stir processing (FSP) [19,20] and rolling [21,22]. However, only limited reports are available to date documenting superplasticity in these alloys after processing by ECAP [23,24] or HPT [25].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and superplasticity in an Mg–Gd–Y–Zr alloy after processing by different SPD techniques

Alizadeh

Mahmudi

Pereira

et al. 2017

Materials Science and Engineering: A

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Mg-Gd-Y-Zr alloys have attracted much attention recently due to their ability to exhibit stable fine-grained microstructures and their potential superplastic behavior. However, the microstructure and superplasticity of these alloys processed by severe plastic deformation (SPD) methods remain less understood. In this work, the microstructure and superplastic behavior of an Mg-5Gd-4Y-0.4Zr (GW54) alloy were investigated after processing using extrusion and the SPD processes of equal-channel angular pressing (ECAP) and high-pressure torsion (HPT).Microstructural characterization by transmission electron microscopy and electron backscattered diffraction showed that nano-sized grains of ~72 ± 5 nm were obtained after 8 HPT turns whereas the grain sizes were about ~4.6 ± 0.2 and ~2.2 ± 0.2 m after extrusion and 4 ECAP passes, respectively. Shear punch tests revealed that the optimum temperature for superplasticity is 623 K for the HPT samples and 723 K for the ECAP and extrusion samples, at which the strain rate sensitivity were measured as about 0.42 ± 0.05, 0.46 ± 0.05 and 0.50 ± 0.05 for the extrusion, ECAP and HPT samples, respectively, and the corresponding activation energies were about 117, 101 and110 ± 5 kJ/mol for these three processing conditions. These results suggest that grain boundary sliding controlled by grain boundary diffusion is the dominant mechanism of deformation at the optimum temperatures for superplastic flow.

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Exceptional high-strain-rate superplasticity in Mg–Gd–Y–Zn–Zr alloy with long-period stacking ordered phase

Cited by 70 publications

References 25 publications

Superplasticity of a nano-grained Mg–Gd–Y–Zr alloy processed by high-pressure torsion

Superplasticity of a nano-grained Mg–Gd–Y–Zr alloy processed by high-pressure torsion

Microstructure evolution and mechanical properties of Mg–Nd–Y alloy in different friction stir processing conditions

Microstructural evolution and superplasticity in an Mg–Gd–Y–Zr alloy after processing by different SPD techniques

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