Effect of Li addition on the mechanical behavior and texture of the as-extruded AZ31 magnesium alloy

Li, Ruihong; Pan, Fusheng; Jiang, Bin; Dong, Hanwu; Yang, Qingshan

doi:10.1016/j.msea.2012.11.032

Cited by 103 publications

(29 citation statements)

References 38 publications

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“…The high strains could inhibit the growth of the grains. So the size and volume fraction of dynamic recrystallizations of fined grains are inversely proportional to the accumulation strains [27,28].…”

Section: Optical Microstructuresmentioning

confidence: 99%

Comparisons of microstructures and texture and mechanical properties of magnesium alloy fabricated by compound extrusion and direct extrusion

Huang

Yuan

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TIn this study, microstructure evolution, textures and mechanical properties of AZ61 magnesium alloy were investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and tensile tests. The samples were processed by a new compound extrusion (CE) which combines direct extrusion (DE) and two steps of equal channel anger extrusion (ECAE). The results show that CE process can refine the microstructure more effectively than the DE process. The CE-fabricated samples have a weaker texture (0002), and a more fine and homogeneous microstructures, which attributes to the additional two steps of ECAE in CE process. In CE process, twin dynamic recrystallization and rotational dynamic recrystallization occurred, which enhances the refinement of the grains and weakening of the texture. In addition, the samples fabricated by CE process display a higher tensile properties (yield strength, tensile strength and elongation) with an excellent balance of strength and tensile ductility. Based on this study, severe plastic deformation (SPD) techniques combining conventional DE and two steps ECAE into a single process are feasibility to improve the mechanical properties of AZ61 Mg alloy.

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Section: Optical Microstructuresmentioning

confidence: 99%

Comparisons of microstructures and texture and mechanical properties of magnesium alloy fabricated by compound extrusion and direct extrusion

Huang

Yuan

et al. 2017

Materials Science and Engineering: A

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“…4. Grain boundaries in the IPF maps were indicated by various lines depending upon the grain-to-grain misorientation angles: gray for 2 o <θ<15 o (low-angle boundaries, LABs) and black for 15 o <θ<90 o (high-angle boundaries, HABs) 26 . It can be seen that a higher density of low angle misorientations (10 o~4 0 o ) was in as-received sheets, while a higher density of high angle misorientations (30 o~9 0 o ) was in MPBA sheets.…”

Section: Resultsmentioning

confidence: 99%

Effect of Multi-Pass Bending Deformation on Microstructure Evolution and Mechanical Properties of AZ31 Alloy Sheet

Yang

Dai

et al. 2016

Mat. Res.

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The rolled AZ31 Mg alloy sheets were processed by multi-pass bending (MPB) process at room temperature and followed by annealing treatment. Mechanical properties of the as-received and MPB sheets in annealed conditions were examined based on the concurrent microstructure and texture evolution. The results show that the room temperature ductility of the Mg sheets was improved by multi-pass bending process. Moreover, the (0002) basal texture was drastically weakened. Enhanced the ambient mechanical properties, such as lower yield strength and larger uniform elongation, were fabricated by MPB path due to the weak basal texture. The microstructure and mechanical responses were characterized and discussed.

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“…Above 10.3 wt.%, the Li microstructure in all Mg–Li alloys is composed of a β(Li) phase [ 10 ]. An increase in the Li content causes a reduction in the lattice constant ratio (c/a = 1.624) of magnesium [ 11 ], as shown by Li et al [ 12 ] with the analysis of an Mg– x Li–3 Al–Zn alloy, where the axial ratio c/a could be reduced from 1.624 to 1.608 when the Li fraction increased from 1 wt.% to 5 wt.%. This situation causes a reduction in critical resolved shear stresses (CRSSs) of slip systems and more slip systems being activated at ambient temperature, thus enhancing the Mg–Li deformation capacity in comparison with other Mg alloys [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

et al. 2020

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In this work, a systematic analysis of the hot deformation mechanism and a microstructure characterization of an as-cast single α-phase Mg–4.5 Li–1.5 Al alloy modified with 0.2% TiB addition, as a grain refiner, is presented. The optimized constitutive model and hot working terms of the Mg–Li alloy were also determined. The hot compression procedure of the Mg–4.5 Li–1.5 Al + 0.2 TiB alloy was performed using a DIL 805 A/D dilatometer at deformation temperatures from 250 °C to 400 °C and with strain rates of 0.01–1 s−1. The processing map adapted from a dynamic material model (DMM) of the as-cast alloy was developed through the superposition of the established instability map and power dissipation map. By considering the processing maps and microstructure characteristics, the processing window for the Mg–Li alloy were determined to be at the deformation temperature of 590 K–670 K and with a strain rate range of 0.01–0.02 s−1.

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Effect of Li addition on the mechanical behavior and texture of the as-extruded AZ31 magnesium alloy

Cited by 103 publications

References 38 publications

Comparisons of microstructures and texture and mechanical properties of magnesium alloy fabricated by compound extrusion and direct extrusion

Comparisons of microstructures and texture and mechanical properties of magnesium alloy fabricated by compound extrusion and direct extrusion

Effect of Multi-Pass Bending Deformation on Microstructure Evolution and Mechanical Properties of AZ31 Alloy Sheet

Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

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