Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Strip Produced by Twin Roll Casting

Nakaura, Yusuke; Watanabe, Akira; Ohori, Koichi

doi:10.2320/matertrans.47.1743

Cited by 31 publications

(14 citation statements)

References 4 publications

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“…The TRC that combines casting and in situ warm rolling produces a unique combination of cast and deformed structure. The structure of the TRC AZ31 sheet consists of a chilled-zone close to the sheet surface, followed by columnar-grains formed as a result of directional solidification [5,[21][22][23][24][25]. Equiaxed grains observed in the central region of the TRC sheet can be attributed to constitutional undercooling.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and texture studies on twin-roll cast AZ31 (Mg–3wt.%Al–1wt.%Zn) alloy and the effect of thermomechanical processing

Masoumi

Zarandi

Pekguleryuz

2011

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Microstructure and texture studies on twin-roll cast AZ31 (Mg–3wt.%Al–1wt.%Zn) alloy and the effect of thermomechanical processing

Masoumi

Zarandi

Pekguleryuz

2011

Materials Science and Engineering: A

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“…The number of rolling passes for the fabrication of a thin sheet can be decreased by procurement of the raw material in as thin a form as possible and/or through the use of a higher reduction ratio per pass. A raw material with a thin thickness can be produced economically by optimization of the horizontal continuous casting process of a plate (not a slab) and in a twin-roll casting process [4,5]. A higher reduction ratio per pass is a more effective than a reduction of the number of rolling passes, but an excessive reduction ratio can lead to defects such as cracking and alligatoring [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of the reduction ratio per pass on the microstructure of a hot-rolled AZ31 magnesium alloy sheet

Yim

Seo²,

You

2009

Met. Mater. Int.

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The effect of the reduction ratio per pass on the microstructural evolution of an AZ31 gravity cast plate during hot rolling was evaluated systematically. {1012} extension twinning was observed in large grains after an earlier rolling pass, but it disappeared upon a subsequent rolling pass due to the reorientation of the grains in an unfavorable direction caused by repetitive rolling. The finer grains were newly formed at the boundaries of the original large grains and twin boundaries by dynamic recrystallization. The grain size distribution was changed from a bimodal distribution upon a small total reduction to a homogeneous distribution upon a large total reduction due to the formation of finer grains that continued at the grain boundaries of large grains by repetitive hot rolling. The size and distribution of the grains were affected not only by the reduction ratio per pass but also by the total reduction (number of rolling passes).

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“…Energy dispersive x-ray spectroscopy data shown in Figure 4c, indicates that these phases are Mn rich, which is consistent with its dominance in the AZ31 composition at ~0.44% wt. These particles are most likely some form of Al-Mn intermetallic that has been predicted and observed in similar AZ alloys [50][51][52]. The precipitate areal density was estimated to 0.98% based on measuring the total area of secondary phases in the images and with spacing as great as ~675 nm.…”

Section: Pyramidal Slip Orientation: (0001)mentioning

confidence: 99%

The effect of size, orientation and alloying on the deformation of AZ31 nanopillars

Aitken

Fan

El‐Awady

et al. 2015

Journal of the Mechanics and Physics of Solids

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The effect of size, orientation and alloying on the deformation of AZ31 nanopillars, Journal of the Mechanics and Physics of Solids, http://dx.doi.org/10.1016/j.jmps. 2014.11.014 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractWe conducted uniaxial compression of single crystalline Mg alloy, AZ31 (Al 3% wt. and Zn 1% wt.) nanopillars with diameters between 300-5000 nm with two distinct crystallographic orientations: (1) along the [0001] c-axis and (2) at an acute angle away from the c-axis, nominally oriented for basal slip. We observe single slip deformation for sub-micron samples nominally oriented for basal slip with the deformation commencing via a single set of parallel shear offsets. Samples compressed along the c-axis display an increase in yield strength compared to basal samples as well as significant hardening with the deformation being mostly homogeneous. We find that the "smaller is stronger" size effect in single crystals dominates any improvement in strength that may have arisen from solid solution strengthening. We employ 3D-discrete dislocation dynamics (DDD) to simulate compression along the [0001] and directions to elucidate the mechanisms of slip and evolution of dislocation microstructure. These simulations show qualitatively similar stress strain signatures to the experimentally obtained stress-strain data. Simulations of compression parallel to the direction reveal the activation and motion of only -type dislocations and virtually no dislocation junction formation. Computations of compression along [0001] show the activation and motion of both and dislocations along with a significant increase in the formation of junctions corresponding to the interaction of intersecting pyramidal planes. Both experiments and simulation show a size effect, with a differing exponent for basal and pyramidal slip. We postulate that this anisotropy in size effect is a result of the underlying anisotropic material properties only. We discuss these findings in the context of the effective resolved shear stress relative to the unit Burgers vector for each type of slip, which reveal that the mechanism that governs size effect in this Mg-alloy is equivalent in both orientations.

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Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Strip Produced by Twin Roll Casting

Cited by 31 publications

References 4 publications

Microstructure and texture studies on twin-roll cast AZ31 (Mg–3wt.%Al–1wt.%Zn) alloy and the effect of thermomechanical processing

Microstructure and texture studies on twin-roll cast AZ31 (Mg–3wt.%Al–1wt.%Zn) alloy and the effect of thermomechanical processing

Effect of the reduction ratio per pass on the microstructure of a hot-rolled AZ31 magnesium alloy sheet

The effect of size, orientation and alloying on the deformation of AZ31 nanopillars

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