Effect of die parameters on the grain size, mechanical properties and fracture mechanism of extruded AZ31 magnesium alloys

Ayer, Önder

doi:10.1016/j.msea.2020.139887

Cited by 45 publications

(16 citation statements)

References 24 publications

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“…As a result, it is seen that the microstructure of the specimens produced by using three different extrusion ratios turns into a more homogeneous and fine-grained structure. 36 In addition, twinning mechanism could be observed for all conditions but a higher extrusion ratio causes to increase in the number of twinning zones. Twinning has an essential role in the dynamic recrystallization mechanism (DRX).…”

Section: Resultsmentioning

confidence: 90%

“…In the second stage, the extrusion ratio does not affect elongation. The results of the reference study 14,36 show that the change in the grain size does not affect elongation.…”

Section: Tensile Test Analysis and Microstructurementioning

confidence: 87%

“…Detailed information is given in the reference. 36 In the second stage, drilling tests were performed by a three-axis vertical machining centre (Quaser MV154 C). Drilling tests were done without using coolant.…”

Section: Methodsmentioning

confidence: 99%

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Influence of extrusion parameters on drilling machinability of AZ31 magnesium alloy

Köklü

Koçar

Morkavuk

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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AZ31 magnesium alloy is mainly used in aerospace applications due to its lightweight and good mechanical properties. The installation of AZ31 alloy in an aircraft usually requires machining operations such as drilling and milling for assembly purposes. The current study aims to investigate the effects of different extrusion ratios (1.77, 2.68, 3.55) on the drilling machinability of AZ31 alloys. The machinability was evaluated with thrust force, borehole surface quality, and chip characteristics. It was found that the thrust force and hole quality depend on the extrusion ratio and cutting parameters. The highest thrust force and surface roughness Ra occurred when drilling AZ31 alloy produced using the highest extrusion ratio of 3.55 in agreement with the improvement in the mechanical properties. The chip length decreased with the increase of the extrusion ratio depending on a decrease in the ductility, while SEM images showed that the AZ31 sample produced using intermediate extrusion ratio had the best hole edge quality and least burr formation.

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Section: Resultsmentioning

confidence: 90%

“…In the second stage, the extrusion ratio does not affect elongation. The results of the reference study 14,36 show that the change in the grain size does not affect elongation.…”

Section: Tensile Test Analysis and Microstructurementioning

confidence: 87%

See 1 more Smart Citation

Influence of extrusion parameters on drilling machinability of AZ31 magnesium alloy

Köklü

Koçar

Morkavuk

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…They found that cracking of large grains and grain boundaries with a large angle of misorientation is the dominant fracture mechanism. Ayer studied the influence of the extrusion ratio on the microstructure and mechanical and fracture properties of the AZ31 alloy [ 29 ]. They estimated that the increased extrusion ratio refines the microstructure and improved the strength.…”

Section: Introductionmentioning

confidence: 99%

“…The fracture surfaces exhibited a ductile and brittle mixture. The fracture mechanism was not influenced by extrusion parameters [ 29 ]. Hot-rolled AZ31 sheets were subjected to dynamic plastic deformation [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Fatigue in an AZ31 Alloy Subjected to Rotary Swaging

et al. 2022

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The magnesium AZ31 alloy was swaged with rotary pressure with the aim of redefining the microstructure and improving mechanical and fatigue properties. The rotary swaging process and subsequent ageing improved the yield stress in tension and compression. In the present study, the investigation was focused on fatigue behaviour. The samples were cycled in a symmetric regime with a frequency of 35 Hz. A dependence of the stress amplitude on the number of cycles up to the fracture was estimated. The microstructure of the samples and fracture surfaces was analysed with a scanning electron microscope. The fatigue process was influenced by the pronounced texture formed in the swaging process. The fatigue properties of the swaged samples improved substantially—the endurance limit based on 107 cycles was approximately 120 MPa—compared to those of the cast alloy. The analysis of the fracture surfaces showed a transcrystalline fatigue fracture.

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