Solid solution softening in dislocation-starved Mg–Al alloys

Nitol, Mashroor; Adibi, Sara; Barrett, Christopher D.; Wilkerson, Justin

doi:10.1016/j.mechmat.2020.103588

Cited by 19 publications

(9 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The desired Al-Mg alloys are constructed by replacing a selected percentage of Al atoms with the same ratio of Mg atoms at the same locations, [31,32] as shown in Fig. 2(a).…”

Section: Model and Simulation Methodsmentioning

confidence: 99%

“…These results agree well with those of Samiri et al [45] and Kumar et al [46] on the mechanical properties of Al-Mg alloys. The reason for the phenomenon opposite to macroscopic solid solution strengthening may be the transition from plastic deformation dominated by dislocation slippage at macroscopic quasi-static low strain rates to dislocation nucleation dominated failure mechanism at microscopic extreme high rates, [31] which was reported by Nitol et al [31] In dislocation-starved nanoporous alloys, the distortion of the host lattice by solute atoms can retard dislocation glide, but aid dislocation nucleation. Compared with pure Al, the yield stress and Young's modulus of Al-5%Mg alloy drop by 10.5% and 7%, respectively.…”

Section: Effect Of Mg Contents On Mechanical Propertiesmentioning

confidence: 97%

See 1 more Smart Citation

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Wei

Shi

et al. 2022

Chinese Phys. B

View full text Add to dashboard Cite

The plastic deformation properties of cylindrical pre-void Aluminum-Magnesium (Al-Mg) alloy under uniaxial tension are explored using molecular dynamics simulations with embedded atom method (EAM) potential. The factors of Mg content, void size, and temperature are considered. The results show that the void fraction decreases with increasing Mg in the plastic deformation, and it is almost independent of Mg content when Mg is beyond 5%. Both Mg contents and stacking faults around the void affect the void growth. These phenomena are explained by the dislocation density of the sample and stacking faults distribution around the void. The variation trends of yield stress caused by void size are in good agreement with Lubarda model. Moreover, temperature effects are explored, the yield stress and Young's modulus obviously decrease with temperature. Our results may enrich and facilitate the understanding of the plastic mechanism of Al-Mg with defects or other alloys.

show abstract

“…The desired Al-Mg alloys are constructed by replacing a selected percentage of Al atoms with the same ratio of Mg atoms at the same locations, [31,32] as shown in Fig. 2(a).…”

Section: Model and Simulation Methodsmentioning

confidence: 99%

Section: Effect Of Mg Contents On Mechanical Propertiesmentioning

confidence: 97%

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Wei

Shi

et al. 2022

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…This “solute softening” effect was observed in recent MD simulations of Fe-Ni nanowires 17 and was attributed to local pressure fluctuations near the surface. Similarly, MD simulations of an isolated spherical pore in Mg have shown a decrease in the spall strength with the addition of Al atoms 18 . This spall softening effect was explained by atomic misfit stresses promoting the dislocation nucleation at the pore surface.…”

Section: Introductionmentioning

confidence: 89%

The impact of alloying on defect-free nanoparticles exhibiting softer but tougher behavior

Bisht

Koju

et al. 2021

Nat Commun

View full text Add to dashboard Cite

The classic paradigm of physical metallurgy is that the addition of alloying elements to metals increases their strength. It is less known if the solution-hardening can occur in nano-scale objects, and it is totally unknown how alloying can impact the strength of defect-free faceted nanoparticles. Purely metallic defect-free nanoparticles exhibit an ultra-high strength approaching the theoretical limit. Tested in compression, they deform elastically until the nucleation of the first dislocation, after which they collapse into a pancake shape. Here, we show by experiments and atomistic simulations that the alloying of Ni nanoparticles with Co reduces their ultimate strength. This counter-intuitive solution-softening effect is explained by solute-induced local spatial variations of the resolved shear stress, causing premature dislocation nucleation. The subsequent particle deformation requires more work, making it tougher. The emerging compromise between strength and toughness makes alloy nanoparticles promising candidates for applications.

show abstract

“…This "solute softening" e↵ect was observed in recent MD simulations of Fe-Ni nanowires [17] and was attributed to local pressure fluctuations near the surface. Similarly, MD simulations of an isolated spherical pore in Mg have shown a decrease in the spall strength with the addition of Al atoms [18]. This spall softening e↵ect was explained by atomic misfit stresses promoting the dislocation nucleation at the pore surface.…”

mentioning

confidence: 90%

Softer but tougher: The impact of alloying on defect-free nanoparticles

Bisht

Koju

et al. 2021

Preprint

View full text Add to dashboard Cite

The classic paradigm of physical metallurgy is that the addition of alloying elements to metals increases their strength. It is less known if the solution-hardening can occur in nano-scale objects, and it is totally unknown how alloying can impact the strength of defect-free faceted nanoparticles. Purely metallic defect-free nanoparticles exhibit an ultra-high strength approaching the theoretical limit. Tested in compression, they deform elastically until the nucleation of the first dislocation, after which they collapse into a pancake shape. Here, we show by experiments and atomistic simulations that the alloying of Ni nanoparticles with Co reduces their ultimate strength. This counter-intuitive solution-softening effect is explained by solute-induced local spatial variations of the resolved shear stress, causing premature dislocation nucleation. At the same time, the subsequent deformation of the particle requires more work, making it tougher. The emerging compromise between strength and toughness can make alloy nanoparticles promising candidates for applications.

show abstract

Solid solution softening in dislocation-starved Mg–Al alloys

Cited by 19 publications

References 43 publications

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

The impact of alloying on defect-free nanoparticles exhibiting softer but tougher behavior

Softer but tougher: The impact of alloying on defect-free nanoparticles

Contact Info

Product

Resources

About