Superplastic behavior of extruded Mg–9RY–4Zn alloy containing long period stacking ordered phase

Leng, Zhe; Zhang, Jinghuai; Lin, Huayi; Fei, Pengfei; Zhang, Li; Liu, Shujuan; Zhang, Milin; Wu, Ruizhi

doi:10.1016/j.msea.2013.04.005

Cited by 18 publications

(5 citation statements)

References 26 publications

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“…9). Cavities tend to grow along FCC grains parallel to the tensile direction and get blocked by B2 and sigma grains 4,45 . The ease of cavity interlinkage is manipulated by the interleaved microstructure of the present HEA, and this has the crucial impact of making it easy to retain quasi-stable plastic flow 46 .…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy

et al. 2020

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Superplasticity describes a material's ability to sustain large plastic deformation in the form of a tensile elongation to over 400% of its original length, but is generally observed only at a low strain rate (~10 −4 s −1), which results in long processing times that are economically undesirable for mass production. Superplasticity at high strain rates in excess of 10 −2 s −1 , required for viable industry-scale application, has usually only been achieved in low-strength aluminium and magnesium alloys. Here, we present a superplastic elongation to 2000% of the original length at a high strain rate of 5 × 10 −2 s −1 in an Al 9 (CoCrFeMnNi) 91 (at%) highentropy alloy nanostructured using high-pressure torsion. The high-pressure torsion induced grain refinement in the multi-phase alloy combined with limited grain growth during hot plastic deformation enables high strain rate superplasticity through grain boundary sliding accommodated by dislocation activity.

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Section: Resultsmentioning

confidence: 99%

Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy

et al. 2020

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“…[ 18 ] The Zr‐rich particles at the grain boundaries can block the cavity growth. [ 100 , 101 ] The microstructure of the present HC‐LRMEA manipulates the cavity interlinkage, which has a significant impact on maintaining quasi‐stable plastic flow. [ 102 ]…”

Section: Resultsmentioning

confidence: 99%

“…[18] The Zr-rich particles at the grain boundaries can block the cavity growth. [100,101] The microstructure of the present HC-LRMEA manipulates the cavity interlinkage, which has a significant impact on maintaining quasi-stable plastic flow. [102] As discussed, this deformation process is denoted as a consecutively triggered "domino" superplastic mechanism (Figure S9, Supporting Information), including a plot of the distinct effects of the consecutive DS, DRX, and GBS mechanisms on the flow stress of the specimen with increasing specimen elongation.…”

Section: Superplasticity Mechanismmentioning

confidence: 99%

Efficient Coarse‐Grained Superplasticity of a Gigapascal Lightweight Refractory Medium Entropy Alloy

Jia

et al. 2023

Advanced Science

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Superplastic metals that exhibit exceptional ductility (>300%) are appealing for use in high‐quality engineering components with complex shapes. However, the wide application of most superplastic alloys has been constrained due to their poor strength, the relatively long superplastic deformation period, and the complex and high‐cost grain refinement processes. Here these issues are addressed by the coarse‐grained superplasticity of high‐strength lightweight medium entropy alloy (Ti43.3V28Zr14Nb14Mo0.7, at.%) with a microstructure of ultrafine particles embedded in the body‐centered‐cubic matrix. The results demonstrate that the alloy reached a high coarse‐grained superplasticity greater than ≈440% at a high strain rate of 10−2 s−1 at 1173 K and with a gigapascal residual strength. A consecutively triggered deformation mechanism that sequences of dislocation slip, dynamic recrystallization, and grain boundary sliding in such alloy differs from conventional grain‐boundary sliding in fine‐grained materials. The present results open a pathway for highly efficient superplastic forming, broaden superplastic materials to the high‐strength field, and guide the development of new alloys.

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“…Figure (10) show the tensile fracture surface at a temperature of 623K of the DSRed specimens which were elongated up to (340, 325 and 205%) and initial strain rate 0.5 x10 -3 , 1.16 x10 -3 and 1.83 x10 -3 s -1 respectively. It is being clearly observed that the specimen is basically fractured intergranularly.…”

Section: Tensile Fracture Surfacementioning

confidence: 99%

“…As observed many of refining grains distributed on fracture surface with originally integrated shapes, which was obviously the result of grain boundary greatly sliding. There were lots of micro cavities coalescences distributed uniformly on fracture surface, these minute cavities experienced the growth, moving and coalescing in the superplastic deformation [10], lastly resulting in materials discontinuity and final failure. Under this combined mechanism, the DSRed AZ31B magnesium alloy obtained the best superplasticity.…”

Section: Tensile Fracture Surfacementioning

confidence: 99%

Effect of Differential Speed Rolling Temperature into Mechanical Properties of AZ31B Magnesium Alloy

Ismail¹,

Hüssein²

2016

ETJ

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The received AZ31B magnesium alloy sheets of 2 mm in thickness were subjected to differential speed rolling (DSR) process performed on a mill, of which the rotation speed ratio of the lower roll and upper one is kept at constant 1.15, by using the different upper and lower roller diameters. The influence of the rolled sheet temperature on the microstructure of the specimens was examined by optical microscopy, and elongation-to-failure of tensile test at temperature 623 K and initial strainrate range between 0.5×10 -3 -1.83×10 -3 s -1 was measured. The present process was found to be effective to refine the grain size. Grain refinement became more marked and uniform. The sheet DSRed at 473K exhibited the highest values of 340% and 0.35 for elongation-to-failure and strain rate sensitivity (m) respectively.

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Superplastic behavior of extruded Mg–9RY–4Zn alloy containing long period stacking ordered phase

Cited by 18 publications

References 26 publications

Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy

Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy

Efficient Coarse‐Grained Superplasticity of a Gigapascal Lightweight Refractory Medium Entropy Alloy

Effect of Differential Speed Rolling Temperature into Mechanical Properties of AZ31B Magnesium Alloy

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