Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micropillars

Liu, Yue; Li, N.; Kumar, M. Arul; Pathak, Siddhartha; Wang, Jyhpyng; McCabe, Rodney J.; Mara, Nathan A.; Tomé, Carlos N.

doi:10.1016/j.actamat.2017.06.008

Cited by 98 publications

(51 citation statements)

References 47 publications

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“…(c-d) Effect of micropillar dimension on the CRSS for twin nucleation and growth for pure Mg. Results from this investigation and from the literature[17,26,28,30,31,35].A size effect of the type 'smaller is stronger' was found in the CRSS for twin nucleation in the micropillars of 3x3 µm 2 of Mg and Mg-9 at.%Al. Nevertheless, the values of + were similar for micropillars of 5x5 µm 2 and 7x7 µm 2 , regardless of the Al content.…”

supporting

confidence: 49%

“…It is well-known that critical stress for dislocation slip [21,[30][31][32]35,46] as well as twin nucleation and growth [17, 26, 28-31, 35, 47-50] increase as the micropillar size decrease. Thus, the analysis of this size effect is mandatory to assess the ability of the micropillar compression tests to provide accurate information about the influence of the solute atoms on the critical stress for twin nucleation and growth.…”

Section: Effect Of the Micropillar Size On The Crss For Twin Nucleatimentioning

confidence: 99%

“…For instance, micropillar compression tests were performed in pure Mg along the a-axis [17,26,28,30,31,35] to explore the effect of the micropillar size on the mechanisms of {1012} twin deformation and on the CRSS for twin growth. Using these techniques, they estimated CRSSs for twin growth of ~7 MPa [26] and 29 MPa [35] in pure Mg.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys

2020

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The effect of Al atoms in solid solution on the critical resolved shear stress for twin nucleation and growth was analyzed by means of the combination of diffusion couples with compression tests in micropillars oriented for twinning. The critical resolved shear stress for twin nucleation was higher than that for twin growth and both increased by the same amount with the Al content. Nevertheless, the increase was small (≈ 10 MPa) for 4 at.%Al but large (up to 60-70 MPa) for 9 at.%Al. These results were in agreement with Labusch-models based on first principles calculations in the dilute regime (< 5 at.%Al) [51]. Comparison with recent data in the literature showed that Al atoms are more effective in increasing the critical resolved shear stresses for twin nucleation and growth than for basal slip [21]. Finally, compression tests in micropillars oriented along [0001] showed the critical shear stress for pyramidal slip increased rapidly with the Al content from 98 MPa in pure Mg to 250 MPa in Mg-9 at.%Al. Thus, the addition of Al increased the plastic anisotropy of Mg alloys.

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supporting

confidence: 49%

Section: Effect Of the Micropillar Size On The Crss For Twin Nucleatimentioning

confidence: 99%

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Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys

2020

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“…The activation of cleavage in the micropillars of Ti 2 AlC MAX phase with low values of μ α max is in contrast to the observed deformation of micropillars of hcp metals with similar values of μ α max . For example, the micropillars of titanium with low values of μ α max undergoes deformation by prismatic slip [27] while under similar circumstances twinning is observed in magnesium [28].…”

Section: Resultsmentioning

confidence: 98%

Non-classical crystallographic slip in a ternary carbide – Ti₂AlC

Zhan

Chen

Radović

et al. 2020

Materials Research Letters

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Herein, we report on mechanical deformation of single-crystal Ti 2 AlC MAX phase using compression testing of micropillars with a range of crystallographic orientations. Our results show that depending on the crystallographic orientation, the Ti 2 AlC micropillars either undergo only non-classical (non-Schmid) crystallographic slip, non-classical crystallographic slip followed by cleavage or cleavage without any appreciable crystallographic slip. The non-classical crystallographic slip is found to be a result of the strong dependence of crystallographic slip on both, the resolved shear stress and the stress normal to the slip plane.

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“…For instance, the CRSS for basal slip measured by K. Eswar Prasad et al [25] in pure Mg micropillars of 3 µm in diameter was six times higher than the one measured in square specimens of 3 x 3 mm 2 cross-section. Another study focused in the compression of micropillars of pure Mg with different diameters concluded that micropillars of at least 10 µm in diameter should be used to avoid size effects [24]. Due to these limitations, nobody has tried to determine the influence of the solute content on the CRSS for basal slip in Mg in the past.…”

Section: Introductionmentioning

confidence: 99%

Effect of solute content and temperature on the deformation mechanisms and critical resolved shear stress in Mg-Al and Mg-Zn alloys

Wang

Alizadeh

et al. 2019

Acta Materialia

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The influence of solute atoms (Al and Zn) on the deformation mechanisms and the critical resolved shear stress for basal slip in Mg alloys at 298 K and 373 K was ascertained by micropillar compression tests in combination with high-throughput processing techniques based on the diffusion couples. It was found that the presence of solute atoms enhances the size effect at 298 K as well as the localization of deformation in slip bands, which is associated with large strain bursts in the resolved shear stress ( "## )-strain (e) curves. Deformation in pure Mg and Mg alloys was more homogeneous at 373 K and the influence of the micropillar size on the critical resolved shear stress was much smaller. In this latter case, it was possible to determine the effect of solute content on the critical resolved shear stress for basal slip in Mg-Al and Mg-Zn alloys.

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Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micropillars

Cited by 98 publications

References 47 publications

Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys

Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys

Non-classical crystallographic slip in a ternary carbide – Ti₂AlC

Effect of solute content and temperature on the deformation mechanisms and critical resolved shear stress in Mg-Al and Mg-Zn alloys

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Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micropillars

Cited by 98 publications

References 47 publications

Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys

Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys

Non-classical crystallographic slip in a ternary carbide – Ti2AlC

Effect of solute content and temperature on the deformation mechanisms and critical resolved shear stress in Mg-Al and Mg-Zn alloys

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Product

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Non-classical crystallographic slip in a ternary carbide – Ti₂AlC