Influence of extrusion parameters on microstructure and texture developments, and their effects on mechanical properties of the magnesium alloy AZ80

Shahzad, M.I.; Wagner, Lothar

doi:10.1016/j.msea.2008.11.038

Cited by 163 publications

(54 citation statements)

References 41 publications

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“…Grain refinement can, among others, be carried out by means of extrusion, 17,18 which leads to recrystallization and the formation of new and fine grains via mechanical and thermal processes. 18,19 The promising magnesium-based alloy LAE442 (containing 4 wt% lithium, 4 wt% aluminium and 2 wt% rare earths) demonstrated slow degradation with a subsequent low impact on the surrounding tissue that would allow for an adequate bone healing, as well as good biocompatibility. 1,20 The influence of various grain sizes on this alloy's degradation and biocompatibility has not been previously tested.…”

Section: Introductionmentioning

confidence: 99%

Influence of the grain size on the in vivo degradation behaviour of the magnesium alloy LAE442

Ullmann

Reifenrath

Seitz

et al. 2013

Proc Inst Mech Eng H

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The aim of this study was to investigate the differences in the in vivo degradation behaviour of magnesium implants with various grain sizes and damaged surfaces. For this purpose, three different LAE442 magnesium implants were produced: cast, single and double extruded implants, in order to obtain different grain sizes. Furthermore, defects were positioned on the surfaces of some of the single extruded implants. The initial stability was determined. Four pins of each implant material were implanted into rabbits' tibiae and regularly clinically, radiologically and m-computed tomographically investigated over a period of 27 weeks. Following explantation, investigations were carried out using stereo and scanning electron microscopy including energy-dispersive X-ray analyses. Weight and strength changes were measured. The double extruded implants possessing the finest grains exhibited the highest initial stability (179.18 N). These implants demonstrated the lowest in vivo corrosion rates (0.0134 mm/year) and the least radiologically visible changes. The highest corrosion rate was computed for the implants possessing damaged surfaces. Radiologically discernible bone changes occurred at almost the same time as implant changes for all groups. Based on these results, the aim should be to produce fine-grained magnesium-based alloys for resorbable implants and to avoid any surface damage.

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Section: Introductionmentioning

confidence: 99%

Influence of the grain size on the in vivo degradation behaviour of the magnesium alloy LAE442

Ullmann

Reifenrath

Seitz

et al. 2013

Proc Inst Mech Eng H

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“…2 shows the texture of the as-extruded and as-ECAPed alloy. A basal texture was observed in the as-extruded alloy, but some basal planes were inclined about 15° to extrusion direction, which was derived from the recrystallization during the hot extrusion [13]. After ECAP for 4 passes at 250 °C, most of basal planes were inclined about 45° to extrusion direction, in addition, part of the basal planes are oriented parallel to the extrusion direction.…”

Section: Resultsmentioning

confidence: 94%

Improvement of Strength and Ductility of Mg‐Zn‐Ca‐Mn Alloy by Equal Channel Angular Pressing

Tong

Zheng

et al. 2011

Magnesium Technology 2011

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“…It hence suggests the possibility to eliminate the tension-compression asymmetry in magnesium alloys by adopting suitable manufacturing processes. For example, lowering extrusion ration or adapting different types of rolling procedure were proposed (Hirsch and Al-Samman, 2013;Kim et al, 2009;Shahzad and Wagner, 2009). 2.…”

Section: Resultsmentioning

confidence: 99%

A polycrystal based numerical investigation on the temperature dependence of slip resistance and texture evolution in magnesium alloy AZ31B

Liu

Wei

2014

International Journal of Plasticity

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a b s t r a c tLow thermoplastic formability is a key factor limiting the usage of magnesium alloys, which otherwise can have broad application in automotive industry for their competitive strength to density ratio. Combining with experimental calibration and validation, we report a systematic numerical investigation about the plastic deformation of magnesium alloy AZ31B at different temperatures and subjected to different boundary conditions. By employing 3D Voronoi grains based microstructure and the crystal plasticity constitutive model developed by Staroselsky and Anand (2003), which accounts for both dislocation slip and deformation twinning in polycrystalline magnesium, we estimate the dependence of critical resolved shear stresses (CRSS) of different slip/twinning systems on temperature. We further obtain the fractional plastic strains contributed by individual slip/twinning systems at different loading conditions. Grain level deformation analysis indicates that there exists significant stress and plasticity inhomogeneity among grains.

show abstract

Influence of extrusion parameters on microstructure and texture developments, and their effects on mechanical properties of the magnesium alloy AZ80

Cited by 163 publications

References 41 publications

Influence of the grain size on the in vivo degradation behaviour of the magnesium alloy LAE442

Influence of the grain size on the in vivo degradation behaviour of the magnesium alloy LAE442

Improvement of Strength and Ductility of Mg‐Zn‐Ca‐Mn Alloy by Equal Channel Angular Pressing

A polycrystal based numerical investigation on the temperature dependence of slip resistance and texture evolution in magnesium alloy AZ31B

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