Influence of Grain Boundaries on Plastic Deformation in Pure Mg and AZ31 Mg Alloy Polycrystals

Ono, Nagato; Nakamura, Kengo; Miura, S.

doi:10.4028/www.scientific.net/msf.419-422.195

Cited by 36 publications

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“…The first effect indicates the strong dependence of the contribution of twinning in compression on the grain size. The latter effect has also been reported by Ono et al [24] who explain it by solution strengthening due to aluminium. Post -stress relaxation effects [25] also indicate that solid solution strengthening due to aluminium is important for the deformation behaviour of AZ alloys.…”

Section: Discussionsupporting

confidence: 56%

On the influence of the grain size and solute content on the AE response of magnesium alloys tested in tension and compression

Bohlen¹,

Dobroň

Swiostek³

et al. 2007

Materials Science and Engineering: A

159

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Tensile and compression tests were conducted for AZ31, AZ61 and AZ80 alloys. The distinctive tension/compression asymmetry in the yield behaviour was analysed for textured samples from extruded bars with various grain sizes. Parallel measurements of the acoustic emission were carried out to gather information about the relative activity of twinning and dislocation glide during deformation. The acoustic emission data are used to elaborate on the possible roles of grain size and aluminium content on the deformation behaviour.

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Section: Discussionsupporting

confidence: 56%

On the influence of the grain size and solute content on the AE response of magnesium alloys tested in tension and compression

Bohlen¹,

Dobroň

Swiostek³

et al. 2007

Materials Science and Engineering: A

159

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“…After hot rolling, the grain size of AZ31 is generally of the order of 10 to 40 m, [7,8,9] with sizes closer to ϳ5 m reported in some instances. [10,11] If the grain size of the AZ31 billet received for use in the present work (ϳ380 m) is typical (and our experience suggests that it is), grain refinement by a factor of 10 to 80 times commonly occurs during hot rolling.…”

Section: Introductionmentioning

confidence: 98%

Microstructural features of rolled Mg-3Al-1Zn

Barnett

Keshavarz

Nave

2005

Metall Mater Trans A

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The microstructures of hot-and cold-rolled Mg-3Al-1Zn (AZ31) are examined using scanning electron and optical microscopy. It is shown that the microstructures following multipass hot rolling and annealing are more uniform than those formed by heavy single pass rolling and annealing. The importance of twins in producing intragranular recrystallization is evident, although the most dominant nucleation site is grain boundaries. The cold-rolled structure after a rolling reduction of 15 pct is dominated by the presence of deformation twins. Twin trace analysis suggests that approximately two thirds of the twins are a form of "c-axis compression" twin. A number of "c-axis tension" twins were also observed and additional in-situ scanning electron microscopy experiments were performed to confirm earlier observations that suggest these twins can form after deformation, during unloading.

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“…[16][17][18] First, the strong dependence of both parameters on orientation texture affects r o and k in opposite directions. [9,19] Second, both parameters depend on the deformation mode (slip or twinning) and, therefore, on the proportions of each, [20][21][22][23] this being especially important in pure Mg. [24][25][26] Third, the strain at which the yield strength is determined [10,27,28] can depend on the individual investigator. Fourth, solid solution effects on both r o and k are important and are yet to be quantified, as explained in more detail below.…”

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confidence: 99%

Grain Size Hardening in Mg and Mg-Zn Solid Solutions

Cáceres

Mann

Griffiths

2011

Metall Mater Trans A

129

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Cast specimens of Mg and of several Mg-Zn binary alloys with a wide range of grain sizes were deformed in tension and compression. The k values calculated from the Hall-Petch (H-P) plots of the tensile 0.2 pct proof stress increased with the Zn content, from 0.24 MPa m 1/2 for pure Mg to~0.66 MPa m 1/2 for the 2.3 at. pct Zn alloy; k values measured from compression tests were larger, typically by 0.05 MPa m 1/2 . When the strength measurements were corrected for the pseudoelastic strain resulting from elastic twinning, the k values generally increased, and the difference between tension and compression was eliminated. This showed that the larger k values obtained in compression using uncorrected data were an artifact of the pseudoelastic effect. The apparent friction stress varied between about 14 MPa for pure Mg to very low or negative values for the most dilute alloy, increasing again to about 8 MPa for the most concentrated alloy. The use of strength data corrected for pseudoelasticity effects is necessary for a consistent analysis of the grain size hardening.

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Influence of Grain Boundaries on Plastic Deformation in Pure Mg and AZ31 Mg Alloy Polycrystals

Cited by 36 publications

References 0 publications

On the influence of the grain size and solute content on the AE response of magnesium alloys tested in tension and compression

On the influence of the grain size and solute content on the AE response of magnesium alloys tested in tension and compression

Microstructural features of rolled Mg-3Al-1Zn

Grain Size Hardening in Mg and Mg-Zn Solid Solutions

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