Excellent superplastic properties achieved in Mg–4Y–3RE alloy in high strain rate regime

Vávra, Tomáš; Minárik, Peter; Veselý, Jozef; Král, Róbert

doi:10.1016/j.msea.2020.139314

Cited by 24 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the range 300-400 • C, an approximate value of 180 kJ/mol is obtained for the activation energy for creep in the R14r05v material, although in the range 400-450 • C, the value becomes negative, without physical meaning, due to the change in deformation mechanism. Temperature-dependent activation energy values were also found for a similar fine-grained Mg-Y-Nd alloy [26]. However, the value obtained, although slightly high, is not far from that corresponding to lattice self-diffusion of magnesium, 135 kJ/mol [27,28], and may be regarded as typical of reinforced magnesium alloys.…”

Section: Discussionmentioning

confidence: 57%

High Strain Rate Superplasticity of WE54 Mg Alloy after Severe Friction Stir Processing

Álvarez-Leal¹,

Carreño²,

Orozco‐Caballero³

et al. 2020

Metals

View full text Add to dashboard Cite

Friction stir processing (FSP) was used on coarse-grained WE54 magnesium alloy plates of as-received material. These were subjected to FSP under two different cooling conditions, refrigerated and non-refrigerated, and different severe processing conditions characterized by low rotation rate and high traverse speed. After FSP, ultrafine equiaxed grains and refinement of the coarse precipitates were observed. The processed materials exhibited high resistance at room temperature and excellent superplasticity at the high strain rate of 10−2 s−1 and temperatures between 300 and 400 °C. Maximum tensile superplastic elongation of 726% was achieved at 400 °C. Beyond 400 °C, a noticeable loss of superplastic response occurred due to a loss of thermal stability of the grain size. Grain boundary sliding is the operative deformation mechanism that can explain the high-temperature flow behavior of the ultrafine grained FSP-WE54 alloy, showing increasing superplasticity with increasing processing severity.

show abstract

Section: Discussionmentioning

confidence: 57%

High Strain Rate Superplasticity of WE54 Mg Alloy after Severe Friction Stir Processing

Álvarez-Leal¹,

Carreño²,

Orozco‐Caballero³

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…The homogenized material was characteristic of coarse grains with grain size of 400 µm, and few twins were detected (Figure 1). X-ray diffraction results show that the homogenized material has a nearly random texture (Figure 2), the relative intensities of the ( 0002 successfully carried out on Mg-Al-Zn [4,5], Mg-Zn-Zr [6,7], Mg-RE [8,9] alloys and pure magnesium [10]. These research studies reported that high strain rate facilitates high density twinning which subsequently induces dynamic recrystallization (DRX); the twinning and DRX can release stress and consume strain energy induced by plastic deformation, and consequently results in remarkable improvement in the formability of the alloys.…”

Section: Methodsmentioning

confidence: 99%

“…Accordingly, low strain rate is adopted for magnesium alloys during the deformation, and as a result, it is costly and inefficient to produce magnesium alloy applications with traditional deformation processes [3]. In recent research, high strain rate deformation was successfully carried out on Mg-Al-Zn [4,5], Mg-Zn-Zr [6,7], Mg-RE [8,9] alloys and pure magnesium [10]. These research studies reported that high strain rate facilitates high density twinning which subsequently induces dynamic recrystallization (DRX); the twinning and DRX can release stress and consume strain energy induced by plastic deformation, and consequently results in remarkable improvement in the Materials 2020, 13, 3050 2 of 12 formability of the alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Texture and Mechanical Properties of AZ31 Magnesium Alloy Fabricated by High Strain Rate Biaxial Forging

Ji-zhao

Deng

et al. 2020

Materials

View full text Add to dashboard Cite

High strain rate biaxial forging (HSRBF) was performed on AZ31 magnesium alloy to an accumulated strain of ΣΔε = 1.32, the related microstructure, texture and mechanical properties were investigated. It was found that the microstructure evolution can be divided into two steps during HSRBF. In the early forging processes, the refinement of the grain is obvious, the size of ~10 μm can be achieved; this can be attributed to the unique mechanisms including the formation of high density twins ({101(-)2} extension twin and {101(-)1}-{101(-)2} secondary twin) and subsequently twining induced DRX (dynamic recrystallization). The thermal activated temperature increases with the increase of accumulated strain and results in the grain growth. Rolling texture is the main texture in the high strain rate biaxial forged (HSRBFed) alloys, the intensity of which decreases with the accumulated strain. Moreover, the basal pole rotates towards the direction of forging direction (FD) after each forging pass, and a basal texture with basal pole inclining at 15–20° from the rolling direction (RD) is formed in the full recrystallized HSRBFed alloys. The grain refinement and tiled texture are attributed to the excellent strength and ductility of HSRMBFed alloys with full recrystallized structure. As the accumulated strain is ΣΔε = 0.88, the HSRMBFed alloy displays an outstanding combination of mechanical properties, the ultimate tensile strength (UTS) is 331.2 MPa and the elongation is 25.1%.

show abstract

“…This suggests that the GBS is dominant in the early stages of deformation. Vávra et al [23] fabricated an ultrafine-grained Mg-4Y-3RE alloy through ECAP and reported superplasticity (~1230%) at temperatures of 350 • C and 400 • C under a strain rate of 0.01 s −1 . They also reported excellent superplasticity (~1000%) at a very high strain rate of 0.1 s −1 but at a relatively higher temperature of 400 • C.…”

Section: Elongation To Fracture and Deformation Mechanismmentioning

confidence: 99%

Microstructure Features and Superplasticity of Extruded, Rolled and SPD-Processed Magnesium Alloys: A Short Review

Malik

Chaudry

Hamad

et al. 2021

Metals

View full text Add to dashboard Cite

In this study, an overview of microstructure features such as grain size, grain structure, texture and its impact on strain rate sensitivity, strain hardening index, activation energy and thermal stability for achieving superplasticity of Mg alloys are presented. The deformation behavior under different strain rates and temperatures was also elaborated. For high elongation to fracture grain boundary sliding, grain boundary diffusion is the dominant deformation mechanism. In contrast, for low-temperature and high strain rate superplasticity, grain boundary sliding and solute drag creep mechanism or viscous glide dislocation followed by GBS are the dominant deformations. In addition, the results of different studies were compared, and optimal strain rate and temperature were diagnosed for achieving excellent high strain rate superplasticity.

show abstract

Excellent superplastic properties achieved in Mg–4Y–3RE alloy in high strain rate regime

Cited by 24 publications

References 31 publications

High Strain Rate Superplasticity of WE54 Mg Alloy after Severe Friction Stir Processing

High Strain Rate Superplasticity of WE54 Mg Alloy after Severe Friction Stir Processing

Microstructure, Texture and Mechanical Properties of AZ31 Magnesium Alloy Fabricated by High Strain Rate Biaxial Forging

Microstructure Features and Superplasticity of Extruded, Rolled and SPD-Processed Magnesium Alloys: A Short Review

Contact Info

Product

Resources

About