Microstructural and mechanical properties evolution of magnesium AZ61 alloy processed through a combination of extrusion and thermomechanical processes

El-Morsy, Abdel-Wahab; Ismail, Agus; Waly, Mostafa I.

doi:10.1016/j.msea.2007.09.044

Cited by 55 publications

(25 citation statements)

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“…The grain size of AZ31 is (10 to 30) µm, compared to AZ61 with a grain size of (10 to 20) µm. Similar to El-Morsy [8], our observation on AZ61 confirmed the existence of Al 12 Mg 17 extracts around the grain boundary of α-Mg. Figure 2 shows similar phenomena in SEM micrographs of AZ31 and AZ61. The precipitation of Al 12 Mg 17 in the solid solution of magnesium is known to affect the thermal conductivity.…”

Section: Resultssupporting

confidence: 85%

Thermal Conductivity of Magnesium Alloys in the Temperature Range from −125 °C to 400 °C

et al. 2012

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Magnesium alloys have been widely used in recent years as lightweight structural materials in the manufacturing of automobiles, airplanes, and portable computers. Magnesium alloys have extremely low density (as low as 1738 kg · m −3 ) and high rigidity, which makes them suitable for such applications. In this study, the thermal conductivity of two different magnesium alloys made by twin-roll casting was investigated using the laser-flash technique and differential scanning calorimetry for thermal diffusivity and specific heat capacity measurements, respectively. The thermal diffusivity of the magnesium alloys, AZ31 and AZ61, was measured over the temperature range from −125 • C to 400 • C. The alloys AZ31 and AZ61 are composed of magnesium, aluminum, and zinc. The thermal conductivity gradually increased with temperature. The densities of AZ31 and AZ61 were 1754 kg · m −3 and 1777 kg · m −3 , respectively. The thermal conductivity of AZ31 was about 25 % higher than that of AZ61, and this is attributed to the amount of precipitation.

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Section: Resultssupporting

confidence: 85%

Thermal Conductivity of Magnesium Alloys in the Temperature Range from −125 °C to 400 °C

et al. 2012

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“…Grain renement in case of Mg alloys is particularly interesting since it not only oers potential improvements in yield stress [2] and fatigue strength [3,4] but also in tensile ductility [5]. Therefore, the formability at low temperatures can markedly be improved by microstructure renement.…”

Section: Introductionmentioning

confidence: 99%

Annealing Effects after Various Thermo-Mechanical Treatments on Microstructure and Mechanical Properties of Wrought Magnesium Alloy ZK60

Janeček

Král

et al. 2012

Acta Phys. Pol. A

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The magnesium alloy ZK60 received from Dead Sea Magnesium in direct-chill cast condition was extruded at T = 350• C using an extrusion ratio of ER = 12. The extruded bars were severely plastically deformed at 250• C by either equal channel angular pressing or swaging. While swaging led to similar grain renements as observed after equal channel angular pressing, yield stress and tensile strength values were by far superior in the swaged material. This result is explained by the unfavourable 45• texture component of the (0002) pole gure that develops during the massive shear deformation in equal channel angular pressing. Unlike equal channel angular pressing, the grain orientation after swaging is similar as in the as-extruded condition. Annealing at elevated temperatures indicates very low thermal stability of microstructure and mechanical properties in the equal channel angular pressing material while both properties in the swaged microstructure are as stable as in the as-extruded reference.

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“…Magnesium alloys are becoming increasingly attractive for use as structural materials in the automotive industry, primarily because of their low densities, excellent damping capacities and their very good recycling capabilities [1,2]. Nevertheless, there are some practical limitations on the use of magnesium alloys in industrial applications because of their susceptibility to corrosion and because these alloys are inherently brittle due to their hexagonal crystal structure and the consequent limited number of active slip systems [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Al₂O₃Particles Weight Fraction on Fracture Mechanism of AZ61 Mg-Al₂O₃System Studied by In Situ Tensile Test in SEM

et al. 2016

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In situ observation of AZ61 Mg alloy with 1 and 5 wt% of Al2O3 in the scanning electron microscopy was performed to study influence of the weight fraction of Al2O3 particles on the deformation and fracture mechanism during tensile test. Structure of the experimental materials was also analysed; microstructures were heterogeneous, with randomly distributed globular Al2O3 particles (average diameter of 25 nm) and Mg17Al12 intermetallic phase (average diameter of 0.4 µm). It was shown that during tensile deformation the failure of Mg17Al12 particles and decohesion of the matrix-Al2O3 particles interphase boundary started simultaneously. Decohesion resulted from the different physical properties of matrix and Al2O3 particles. The influence of the Al2O3 weight fraction on the final fracture was evident; for material with 5 wt% of Al2O3, the fracture surface was approximately perpendicular to the loading direction and for material with 1 wt% of Al2O3 was at 45• angle. Fracture surface had transcrystalline ductile character.

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Microstructural and mechanical properties evolution of magnesium AZ61 alloy processed through a combination of extrusion and thermomechanical processes

Cited by 55 publications

References 20 publications

Thermal Conductivity of Magnesium Alloys in the Temperature Range from −125 °C to 400 °C

Thermal Conductivity of Magnesium Alloys in the Temperature Range from −125 °C to 400 °C

Annealing Effects after Various Thermo-Mechanical Treatments on Microstructure and Mechanical Properties of Wrought Magnesium Alloy ZK60

Influence of Al₂O₃Particles Weight Fraction on Fracture Mechanism of AZ61 Mg-Al₂O₃System Studied by In Situ Tensile Test in SEM

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Microstructural and mechanical properties evolution of magnesium AZ61 alloy processed through a combination of extrusion and thermomechanical processes

Cited by 55 publications

References 20 publications

Thermal Conductivity of Magnesium Alloys in the Temperature Range from −125 °C to 400 °C

Thermal Conductivity of Magnesium Alloys in the Temperature Range from −125 °C to 400 °C

Annealing Effects after Various Thermo-Mechanical Treatments on Microstructure and Mechanical Properties of Wrought Magnesium Alloy ZK60

Influence of Al2O3Particles Weight Fraction on Fracture Mechanism of AZ61 Mg-Al2O3System Studied by In Situ Tensile Test in SEM

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Influence of Al₂O₃Particles Weight Fraction on Fracture Mechanism of AZ61 Mg-Al₂O₃System Studied by In Situ Tensile Test in SEM