Effect of grain size on slip activity in pure magnesium polycrystals

Cepeda-Jiménez, C.M.; Molina-Aldareguia, J.M.; Pérez‐Prado, M.T.

doi:10.1016/j.actamat.2014.10.001

Cited by 204 publications

(73 citation statements)

References 67 publications

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“…It should be noted that the frequency of misorientations >80° decreases during tensile deformation up to 50% elongation which suggests twinning does not play a major role during deformation since the twinning in magnesium is expected to promote a rotation of ~86° of the lattice [30]. This is in agreement with the reduced activity of twinning in fine-grained magnesium reported elsewhere [9].…”

Section: Microstructural Evolution During Tensile Testingsupporting

confidence: 80%

“…This suggests rotation of grains towards a preferential orientation. It has been shown that basal slip can propagate through grain boundaries with misorientations <35º in pure magnesium with fine grain sizes [9]. Hence, the present results suggest grain boundaries with low misorientations are more stable during deformation in fine grained magnesium.…”

Section: Microstructural Evolution During Tensile Testingsupporting

confidence: 52%

“…The accommodation of plastic deformation was attributed to a mechanism of strain propagation through boundaries with misorientations of <35°. Thus, the ductility of a sample with a grain size of 5 µm was lower than in samples with grain sizes of 19 and 36 µm and this was due directly to the limited strain accommodation by this mechanism [9]. 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].…”

Section: Introductionmentioning

confidence: 99%

“…A recent report showed that the contribution of twinning and non-basal slip decreases with decreasing grain size in magnesium and there is slip propagation in basal planes through grain boundaries with misorientations <35º [9]. Therefore, most plastic deformation in finegrained magnesium takes place by basal slip along bands of grains with low misorientations but this mechanism can only accommodate a limited amount of deformation [9].…”

Section: Analysis Of Creep Mechanisms Operating In Magnesiummentioning

confidence: 99%

“…It was shown recently that non-basal slip and twinning are severely hindered during tensile testing at 323 K when the grain size is reduced to ~5 µm and this was interpreted in terms of an increase with grain refinement in the ratio of the critical resolved shear stress for non-basal to basal slip [9]. The accommodation of plastic deformation was attributed to a mechanism of strain propagation through boundaries with misorientations of <35°.…”

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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Section: Microstructural Evolution During Tensile Testingsupporting

confidence: 80%

Section: Microstructural Evolution During Tensile Testingsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Analysis Of Creep Mechanisms Operating In Magnesiummentioning

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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Tailoring Microstructure and Properties of Fine Grained Magnesium Alloys by Severe Plastic Deformation

2017

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Modern wrought magnesium alloys have poor formability at room temperature, which impedes the wider uptake of these alloys by the industry. Over the last decades, research activities in the area of magnesium alloy development have grown enormously and have produced a pallet of exciting findings, which the authors summarize in this concise review focused on the effect of the microstructure, primarily of grain size, on room temperature ductility of wrought Mg-based alloys. Well-established paths and modern strategies to control over the grain size distribution are discussed. It is demonstrated that the use of severe plastic deformation techniques for ultimate grain refinement in magnesium alloys opens new windows for improving their mechanical properties profile by managing both strength and ductility in a wide range. However, it is shown that grain size alone cannot be regarded as a key parameter controlling the mechanical behavior of Mg alloys. The effect of texture is of paramount importance for the overall mechanical response of Mg alloys and this may supersede the influence of grain size.

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Effect of Numbers of Turns of High‐Pressure Torsion on the Development of Exceptional Ductility in Pure Magnesium

2019

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The low ductility of magnesium at room temperature is usually attributed to an insufficient number of independent slip systems. Recent research has shown that refining the grain structure of pure magnesium promotes a breakdown in the Hall-Petch relationship at low strain rates and may lead to the development of exceptional ductilities. The report describes the evolution of microstructure and the mechanical behaviour of pure magnesium using different amounts of imposed plastic deformation by high pressure torsion (HPT). It is shown that the initial coarse grains undergo twinning followed by a gradual grain refinement. The flow stress at low strain rates decreases as the grain size is reduced, thereby confirming an inverse Hall-Petch behaviour. The elongation to failure increases with grain refinement and elongations over 300% are achieved after 1/2 turn of HPT. These experimental data agree with a model for the low temperature deformation behaviour of fine-grained pure magnesium.

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Effect of grain size on slip activity in pure magnesium polycrystals

Cited by 204 publications

References 67 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

Tailoring Microstructure and Properties of Fine Grained Magnesium Alloys by Severe Plastic Deformation

Effect of Numbers of Turns of High‐Pressure Torsion on the Development of Exceptional Ductility in Pure Magnesium

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