Ductility improvement of Mg alloys by solid solution: Ab initio modeling, synthesis and mechanical properties

Sandlöbes, Stefanie; Pei, Zongrui; Friák, Martin; Zhu, Li; Wang, Fulin; Zaefferer, Stefan; Raabe, Dierk; Neugebauer, Jörg

doi:10.1016/j.actamat.2014.02.011

Cited by 266 publications

(99 citation statements)

References 56 publications

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“…Combining them with the developed dislocation-based ductility descriptors (e.g., 26,27 ) will allow for a more comprehensive description of the deformation mechanisms active in Mg and Mg alloys.…”

Section: Discussionmentioning

confidence: 99%

Atomic structures of twin boundaries in hexagonal close-packed metallic crystals with particular focus on Mg

et al. 2017

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We have investigated twin boundaries in double-lattice hexagonal close-packed metallic materials, focusing on their atomic geometry. Combining accurate ab-initio methods and large-scale atomistic simulations we address the following two fundamental questions: (i) What are the possible intrinsic twin boundary structures in hcp crystals? (ii) Are these structures stable against small distortions? In order to help end a decade-long controversy over the experimental observations of the atomic structures of twin boundaries, we have determined the energetics, spectra, and transition mechanisms of the twin boundaries. Our results confirm that the mechanical stability controls structures which are observed.

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Section: Discussionmentioning

confidence: 99%

Atomic structures of twin boundaries in hexagonal close-packed metallic crystals with particular focus on Mg

et al. 2017

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“…owing to the back-stresses induced by the neighboring grains [24]), the further deformation is substantiated by activation of a new mechanism. The dislocation slip in the second order ({1122} 11 23 ) pyramidal plane, accommodating strain along the crystal c−axis and oering ve independent slip systems is the possibility, which was found out and studied both experimentally [7,25] and theoretically [26]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of Loading Mode on the Evolution of the Dislocation Structure in Magnesium

et al. 2015

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The evolution of the dislocation structure in randomly textured cast magnesium as a function of loading mode is studied using whole neutron diraction pattern line prole analysis and elasto-plastic self-consistent modeling. Both the experimental results and the theoretical data indicate the onset of basal slip at low stresses and the key role of prismatic slip in the macroscopic yield. Dependence of the second-order pyramidal slip on the loading mode is revealed.

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“…This change in behaviour itself has been attributed to an increased activity of c-axis compression (f10-11g) twinning and pyramidal slip. 25,53 This, in turn, can be explained by a reduction in the I 1 stacking fault energy in magnesium when RE is added, 22,54 which is predicted to be even more pronounced when zinc is also present. 54 The changes in SFE combined with the tendency for RE to segregate to dislocations and boundaries are therefore the fundamental underlying factors that are necessary to explain all the other phenomena that emerge when RE additions are present.…”

Section: Texture Modificationmentioning

confidence: 99%

“…17,18 Recent atomistic modelling work has helped greatly in understanding the effect of different alloying elements on solid solution strengthening potency. [19][20][21][22] Atomistic calculations allow the influence of different solutes on stacking fault energy (SFE) and cross-slip to be computed from first principles, which can be used to predict the influence on the CRSS for basal and prismatic slip. Solutes that enhance basal to prismatic cross-slip lead to the solute softening effect and reduce the CRSS difference between these modes.…”

Section: Effect Of Solute and Precipitates On Anisotropymentioning

confidence: 99%

Critical Assessment 9: Wrought magnesium alloys

Robson¹

2015

Materials Science and Technology

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This assessment is focussed on wrought magnesium alloys for lightweight applications, particularly in the transport sector. The challenges to their wider use are summarised, including poor low temperature formability, corrosion issues, dissimilar metal joining, and limited precipitation strengthening. The fundamental origins of these challenges, and current research to address them, are highlighted. Key developments such as the use of dilute rare earth additions to manipulate texture for improved formability are discussed. Opportunities to exploit the unique properties of wrought magnesium alloys where further research is required are identified.

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Ductility improvement of Mg alloys by solid solution: Ab initio modeling, synthesis and mechanical properties

Cited by 266 publications

References 56 publications

Atomic structures of twin boundaries in hexagonal close-packed metallic crystals with particular focus on Mg

Atomic structures of twin boundaries in hexagonal close-packed metallic crystals with particular focus on Mg

Effect of Loading Mode on the Evolution of the Dislocation Structure in Magnesium

Critical Assessment 9: Wrought magnesium alloys

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