Superplasticity in high temperature magnesium alloy WE43

Kandalam, Sahithya; Sabat, R.K.; Bibhanshu, Nitish; Avadhani, G. S.; Kumar, Shakti; Suwas, Satyam

doi:10.1016/j.msea.2016.12.129

Cited by 48 publications

(12 citation statements)

References 34 publications

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“…In this case, the structure caused by MAD is rather homogeneous, which positively affects the stability of the final properties. It is also worth noting that the effect of MAD on the structure and properties of alloy WE43 was already considered in [12,21,29,30]. However, according to these articles, the authors failed to achieve the formation of a UFG structure in the alloy investigated.…”

Section: Introductionmentioning

confidence: 98%

“…This procedure has been widely used, for example, to improve the properties of aluminum [18,19] and titanium [20] alloys. In addition, the effectiveness of using this processing method for grain refinement in magnesium alloys down to the UFG state was demonstrated in [12,21,22,23,24,25,26,27,28,29,30]. Thus, Li et al [26] showed that the application of MAD to alloy Mg-2%Zn-2%Gd allows attaining a very fine microstructure with the average grain size of ~500 nm.…”

Section: Introductionmentioning

confidence: 99%

“…However, according to these articles, the authors failed to achieve the formation of a UFG structure in the alloy investigated. The grain size attained through MAD processing in these cases was 4.8 µm [12] and 6 µm [30]. This relatively low degree of grain refinement can be associated with the high processing temperature, which prevented the accumulation of a sufficiently high dislocation density.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

et al. 2019

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In this work, the effect of an ultrafine-grained (UFG) structure obtained by multiaxial deformation (MAD) on the mechanical properties, fatigue strength, biodegradation, and biocompatibility in vivo of the magnesium alloy WE43 was studied. The grain refinement down to 0.93 ± 0.29 µm and the formation of Mg41Nd5 phase particles with an average size of 0.34 ± 0.21 µm were shown to raise the ultimate tensile strength to 300 MPa. Besides, MAD improved the ductility of the alloy, boosting the total elongation from 9% to 17.2%. An additional positive effect of MAD was an increase in the fatigue strength of the alloy from 90 to 165 MPa. The formation of the UFG structure also reduced the biodegradation rate of the alloy under both in vitro and in vivo conditions. The relative mass loss after six weeks of experiment was 83% and 19% in vitro and 46% and 7% in vivo for the initial and the deformed alloy, respectively. Accumulation of hydrogen and the formation of necrotic masses were observed after implantation of alloy specimens in both conditions. Despite these detrimental phenomena, the desired replacement of the implant and the surrounding cavity with new connective tissue was observed in the areas of implantation.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

et al. 2019

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“… Alloy Processing method T/°C Strain rate/s −1 δ/% Ref. Mg-1Zn-3Gd (wt%) Extrusion + ECAP 400 3.3 × 10 −3 s −1 800 32 Mg-4Gd-7Y-1Zn (wt%) Extrusion 470 1.7 × 10 −4 s −1 700 33 Mg-4.3Zn-0.7Y (wt%) 8 passes ECAP 350 1.5 × 10 −4 s −1 600 34 Mg-4.3Zn-0.7Y (wt%) Hot rolling 300 1 × 10 −3 s −1 120 16 Mg-13Zn-1.55Y (wt%) High speed rolling 250 1 × 10 −3 s −1 1021 35 Mg-5.8Zn-1Y-0.48Zr (wt%) Extrusion + ECAP 350 1.7 × 10 −3 s −1 800 11 Mg-7.12Zn-1.2Y-0.84Zr (wt%) Hot rolling + FSP 450 1 × 10 −2 s −1 1110 12 Mg-7Zn-5Gd-0.6Zr (wt%) Extrusion 250 1.67 × 10 −3 s −1 863 this work …”

Section: Discussionmentioning

confidence: 99%

Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime

Yin

Zhang

et al. 2019

Sci Rep

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Mg-7Zn-5Gd-0.6Zr (wt%) alloy strengthened with quasicrystal phase (I-Mg3Zn6Gd phase) is prepared through hot extrusion and subsequent heat treatments. The low temperature (range from 25 °C to 250 °C) superplastic deformation behavior of the as-extruded, aging treated (T5) and solution and aging treated (T6) alloys are investigated. The results reveal that a superior superplastic elongation of 863% is obtained at 250 °C and strain rate of 1.67 × 10−3 s−1 and the elongation of this alloy increases with the increasing tensile temperature. Detailed microstructural analyses show that I-Mg3Zn6Gd phase and W-Mg3Gd2Zn3 phase are crushed into small particles during extrusion. A high density of nanoscale I-phase precipitates after T5 treatment. Dynamic recrystallization occurs in as-extruded Mg-7Zn-5Gd-0.6Zr alloy. The T5-treated Mg-7Zn-5Gd-0.6Zr alloy shows a relatively weak basal texture intensity, a large number fraction of high angle boundaries and a very finer grain structure (3.01 μm). During superplastic deformation, the nanoscale I-phase is slightly elongated and the microstructure is still equiaxed grains. The superplastic mechanism of the alloy is grain boundary sliding (GBS) accommodated by dislocation movement and static recrystallization. The cavity nucleation at the nanoscale I-phase/α-Mg matrix boundaries or grain boundaries and the cavity stringer formation leads to final fracture.

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“…Superplastic forming is a novel deformation technique for fabrication of varied and complicated shaped components due to utilizing low force, large plastic strains and few energy costs [4]. Accordingly, numerous investigations on superplastic deformation of materials have been studied, such as aluminum [5,6,7], titanium [8,9,10], magnesium alloy [11,12,13], high-entropy alloy [14,15] and nickel-base superalloys [16,17,18,19]. Specific mechanisms to superplastic behavior are: (i) grain boundary diffusion, (ii) grain rotation and rearrangement, (iii) grain boundary sliding and slip accommodation and finally migration of the grain boundaries [20].…”

Section: Introductionmentioning

confidence: 99%

Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151

Jia

et al. 2019

Materials

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The superplastic deformation of a hot-extruded GH4151 billet was investigated by means of tensile tests with the strain rates of 10−4 s−1, 5 × 10−4 s−1 and 10−3 s−1 and at temperatures at 1060 °C, 1080 °C and 1100 °C. The superplastic deformation of the GH4151 alloy was reported here for the first time. The results reveal that the uniform fine-grained GH4151 alloy exhibited an excellent superplasticity and high strain rate sensitivity (exceeded 0.5) under all experimental conditions. It was found that the increase of strain rate resulted in an increased average activation energy for superplastic deformation. A maximum elongation of 760.4% was determined at a temperature of 1080 °C and strain rate of 10−3 s−1. The average activation energy under different conditions suggested that the superplastic deformation with 1 × 10−4 s−1 in this experiment is mainly deemed as the grain boundary sliding controlled by grain boundary diffusion. However, with a higher stain rate of 5 × 10−4 s−1 and 1 × 10−3 s−1, the superplastic deformation is considered to be grain boundary sliding controlled by lattice diffusion. Based on the systematically microstructural examination using optical microscope (OM), SEM, electron backscatter diffraction (EBSD) and TEM techniques, the failure and dynamic recrystallization (DRX) nucleation mechanisms were proposed. The dominant nucleation mechanism of dynamic recrystallization (DRX) is the bulging of original grain boundaries, which is the typical feature of discontinuous dynamic recrystallization (DDRX), and continuous dynamic recrystallization (CDRX) is merely an assistant mechanism of DRX. The main contributions of DRX on superplasticity elongation were derived from its grain refinement process.

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Superplasticity in high temperature magnesium alloy WE43

Cited by 48 publications

References 34 publications

Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime

Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151

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