Thermal-activation parameters for asymmetric {211} slip in Li-Mg alloy crystals

Saka, Hiroyasu; Taylor, Graham K.

doi:10.1080/01418618208240911

Cited by 7 publications

(1 citation statement)

References 7 publications

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“…They measured the temperature dependence of the flow stresses and found that slip occurred at low temperatures in <111> directions on {211} planes. Saka and Taylor [44] interpreted these results in terms of the Peierls barrier. This mechanism is active up to approximately 200 K. At higher temperatures, the thermally activated mechanism seems different.…”

Section: Mg12li (β Phase) Mg8li (α + β) Phasementioning

confidence: 95%

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg–Li Metal-Matrix Composites

Trojanová

Drozd

Lukáč

et al. 2021

Metals

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Stress-relaxation tests were performed during plastic deformation at room temperature of three magnesium Mg–Li alloys reinforced with 10 vol% of short Saffil fibers. For comparison, the composite with the Mg matrix was studied. The time dependencies of the stress decrease were analyzed with the aim to determine the activation volume and the main types of thermally activated processes occurring during plastic flow. The Mg4Li matrix alloy exhibited the hcp structure, while the composite with the Mg12Li matrix alloy had the bcc structure. The third alloy, Mg8Li, combined both phases, hcp and bcc. The stress acting in the matrix was divided into two components: the internal stress and the effective stress. Activation volume and stress-sensitivity parameters were determined as a function of effective stress and strain. While the values of the activation volume depending on the effective stress lay on one “master” curve, the strain dependence was different for all materials. The main thermally activated process in the hcp structure was the dislocation motion in the noncompact planes, while in the bcc structure, massive recovery processes connected with an increase in dislocations were identified.

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Section: Mg12li (β Phase) Mg8li (α + β) Phasementioning

confidence: 95%

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg–Li Metal-Matrix Composites

Trojanová

Drozd

Lukáč

et al. 2021

Metals

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Influence of Interaction Range on Computed Peierls Stress and Dislocation Displacement in B.C.C. Lithium

Beauchamp¹,

Prévost²

1983

Physica Status Solidi (b)

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The simple form of interaction between [ l l l ] rows deduced from pseudo-potential theory is used to compute the core structure, the Peierls stress and the glide plane of a a/2 [lll] screw dislocation a t 0 K in b.c.c. lithium. Particular attention is given to the influence of the cut-off radius of the row interaction. It is found that the unstressed core structure and the stresses producing a movement of the dislocation are only weakly dependent on the cut-off radius. The glide plane is either (112) twinning or (112) antitwinning depending on the range of row interaction so that one cannot forecast what it could be if interactions are taken into account completely.On a utilise la forme simple de l'interaction entre rangees [lll] deduite de la thborie des pseudopotentiels pour calculer, dans le lithium cubique centre, la structure de coeur, la contrainte de Peierls et le plan de glissement de la dislocation vis a/2 [lll], 8. 0 K. One s'est particulihrement int6ressC 8. 'influence du rayon de coupure de I'interaction entre rangees. On trouve que la structure de coeur en l'absence de contrainte et les contraintes produisant un mouvement de la dislocation dependent pen du rayon de coupure. Le plan de glissement est soit (112) maclage, soit (112) anti-maclage suivant la port4e des interactions entre rangees, si bien qu'on ne peut pas prevoir ce qu'il serait en tenant compte compl6tement des interactions.

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Thermally-activated deformation of BCC metals and alloys

Taylor¹

1992

Progress in Materials Science

219

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Thermal-activation parameters for asymmetric {211} slip in Li-Mg alloy crystals

Cited by 7 publications

References 7 publications

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg–Li Metal-Matrix Composites

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg–Li Metal-Matrix Composites

Influence of Interaction Range on Computed Peierls Stress and Dislocation Displacement in B.C.C. Lithium

Thermally-activated deformation of BCC metals and alloys

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