Origin of the twinning to slip transition with grain size refinement, with decreasing strain rate and with increasing temperature in magnesium

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

doi:10.1016/j.actamat.2015.01.032

Cited by 135 publications

(36 citation statements)

References 53 publications

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“…3(d)), in agreement with earlier studies [11,12]. CepedaJiménez et al [11,12] have recently proven by electron backscattered diffraction (EBSD)-assisted slip trace analysis [13] that such bands are mostly populated by ð0001Þb1120 N (basal) dislocations.…”

supporting

confidence: 80%

Onset of room temperature ferromagnetism by plastic deformation in three paramagnetic pure metals

et al. 2016

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supporting

confidence: 80%

Onset of room temperature ferromagnetism by plastic deformation in three paramagnetic pure metals

et al. 2016

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“…Increasing the imposed strain leads to an increase in the fraction of boundaries with angles of ≈30° of misorientation and this preferential misorientation persists up to a saturation in the structure evolution at 10 turns. Slip propagation across grain boundaries with misorientations lower than 35° has been reported in fine‐grained magnesium . Thus, the high frequency of boundaries with misorientations of ≈30° suggests that this slip transfer mechanism takes place during the HPT processing of magnesium.…”

Section: Structure Evolutionmentioning

confidence: 82%

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Figueiredo

Langdon

2018

Adv Eng Mater

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Magnesium and its alloys have attracted significant attention in recent years because they display high strength-to-density ratios, they are biodegradable and they provide a potential for hydrogen storage. Many investigations have examined the effect of high-pressure torsion processing on the microstructures and properties of these materials so that numerous reports are now available. This overview provides a summary of the observations reported to date on the structure and mechanical property evolution including the nature of grain refinement, the grain boundary misorientation distributions, texture evolution, and the minimum grain size. For convenience, the mechanical properties are separated into hardness, tensile behavior, and superplastic properties. It is shown that the mechanism of grain refinement differs from other metallic materials processed by severe plastic deformation but high strength may be achieved in magnesium alloys and exceptional ductility in pure magnesium. Hydrogen storage and corrosion behavior are also examined together with a discussion of recent attempts to produce magnesium-based nanocomposites through processing by high-pressure torsion.

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“…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%

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.

show abstract

Origin of the twinning to slip transition with grain size refinement, with decreasing strain rate and with increasing temperature in magnesium

Cited by 135 publications

References 53 publications

Onset of room temperature ferromagnetism by plastic deformation in three paramagnetic pure metals

Onset of room temperature ferromagnetism by plastic deformation in three paramagnetic pure metals

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

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

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