The influence of grain size and strain rate on the mechanical behavior of pure magnesium

Figueiredo, Roberto B.; Poggiali, Flávia Spitale Jacques; Silva, Cláudio L. P.; Cetlin, Paulo Roberto; Langdon, Terence G.

doi:10.1007/s10853-015-9612-x

Cited by 74 publications

(54 citation statements)

References 34 publications

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“…Thus, the microstructure is composed essentially of ultrafine grains after 10 turns of HPT which is consistent with earlier reports using TEM analysis [5,24].…”

Section: Microstructures After Hptsupporting

confidence: 92%

“…It is important to note also that these curves exhibit essentially no variation between 2 and 10 turns which suggests that the mechanical behavior of the material is not changed after 2 turns. A similar trend of increasing slope with decreasing grain size was observed in dynamic hardness testing in an earlier report using magnesium in the as-cast condition and processing by equal-channel angular pressing (ECAP) and HPT [5].…”

Section: Dynamic Hardness Testingsupporting

confidence: 83%

“…Nevertheless, excellent ductilities were recorded in pure magnesium with even finer grain structures including an elongation of 230% in a sample with a grain size of 1.2 µm tested at room temperature at a low strain rate of 10 -5 s -1 [7]. Good plasticity at room temperature was observed also in fine-grained magnesium tested at low strain rates [5]. In order to explain this different deformation behavior observed at low strain rates in finegrained magnesium, a mechanism of strain accommodation was proposed based on basal slip and grain boundary rotation [5].…”

Section: Introductionmentioning

confidence: 88%

“…Also, experiments show that the fraction of grains with twinning is independent of the grain area although grain areas smaller than ~21 µm 2 , corresponding to grain diameters of <5.25 µm, were not considered [2]. However, a twinning to slip transition was reported in compression testing when reducing the grain size in an AZ31 magnesium alloy [3] and also in pure magnesium [4,5]. Moreover, there is some limited evidence for a grain boundary sliding contribution in plastic deformation at room temperature [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Good plasticity at room temperature was observed also in fine-grained magnesium tested at low strain rates [5]. In order to explain this different deformation behavior observed at low strain rates in finegrained magnesium, a mechanism of strain accommodation was proposed based on basal slip and grain boundary rotation [5].…”

Section: Introductionmentioning

confidence: 99%

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Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

et al. 2017

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An investigation was conducted to examine the mechanical behavior and microstructure evolution during deformation of ultrafine-grained pure magnesium at low temperatures within the temperature range of 296 -373 K. Discs were processed by high-pressure torsion until saturation in grain refinement. Dynamic hardness testing revealed a gradual increase in strain rate sensitivity up to m ≈ 0.2. High ductility was observed in the ultrafine-grained magnesium including an exceptional elongation of ~360% in tension at room temperature and stable deformation in micropillar compression. Grain coarsening and an increase in frequency of grain boundaries with misorientations in the range 15°  45° occurred during deformation in tension. The experimental evidence, when combined with an analysis of the deformation behavior, suggests that grain boundary sliding plays a key role in low strain rate deformation of pure magnesium when the grain sizes are at and below ~5 µm.

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“…Thus, the microstructure is composed essentially of ultrafine grains after 10 turns of HPT which is consistent with earlier reports using TEM analysis [5,24].…”

Section: Microstructures After Hptsupporting

confidence: 92%

Section: Dynamic Hardness Testingsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

et al. 2017

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Modeling and Optimization Methods in Forming Processes

Pruncu

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Lin

2021

Modeling and Optimization in Manufacturing

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Using Post‐Deformation Annealing to Optimize the Properties of a ZK60 Magnesium Alloy Processed by High‐Pressure Torsion

2017

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A ZK60 magnesium alloy with an initial grain size of %10 mm is processed by high-pressure torsion (HPT) through 5 revolutions under a constant compressive pressure of 2.0 GPa with a rotation speed of 1 rpm. An average grain size of %700 nm is achieved after HPT with a high fraction of highangle grain boundaries. Tensile experiments at room temperature show poor ductility. However, a combination of reasonable ductility and good strength is achieved with post-HPT annealing by subjecting samples to high temperatures in the range of 473-548 K for 10 or 20 min. The grain size and texture changes are also examined by electron back scattered diffraction (EBSD) and the results compared to long-term annealing for 2500 min at 450 K. The results of this study suggest that a post-HPT annealing for a short period of time may be effective in achieving a reasonable combination of strength and ductility.

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The influence of grain size and strain rate on the mechanical behavior of pure magnesium

Cited by 74 publications

References 34 publications

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Modeling and Optimization Methods in Forming Processes

Using Post‐Deformation Annealing to Optimize the Properties of a ZK60 Magnesium Alloy Processed by High‐Pressure Torsion

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