A comparative study on the microstructural evolution in AM60 alloy processed by ECAP and MDF

Heczel, Anita; Akbaripanah, F.; Salevati, M. A.; Mahmudi, R.; Vida, Ádám; Gubicza, Jenő

doi:10.1016/j.jallcom.2018.06.002

Cited by 33 publications

(9 citation statements)

References 40 publications

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“…This increase is attributed to the recrystallization driven by SPD during ECAP [ 58 ]. The aforementioned findings agree with previous studies [ 19 , 58 , 59 , 60 , 61 ].…”

Section: Resultssupporting

confidence: 93%

Influence of Ultrafine-Grained Microstructure and Texture Evolution of ECAPed ZK30 Magnesium Alloy on the Corrosion Behavior in Different Corrosive Agents

et al. 2022

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Magnesium-Zinc-Zirconium (Mg-Zn-Zr) alloys have caught considerable attention in medical applications where biodegradability is critical. The combination of their good biocompatibility, improved strength, and low cytotoxicity makes them great candidates for medical implants. This research investigation is focused on providing further insight into the effects of equal channel angular processing (ECAP) on the corrosion behavior, microstructure evolution, and mechanical properties of a biodegradable ZK30 alloy. Billets of Mg-3Zn-0.6 Zr (ZK30) alloy were processed through ECAP up to 4 passes of route Bc (rotating the billets 90° in the same direction between the subsequent passes) at 250 °C. Electron back-scatter diffraction (EBSD) was utilized to investigate the microstructural evolution as well as the crystallographic texture. Several electrochemical measurements were carried out on both a simulated body fluid and a 3.5% sodium chloride (NaCl) solution. Mechanical properties such as Vicker’s hardness and tensile properties were also assessed. The as-annealed (AA) microstructure was dominated by equiaxed coarse recrystallized grains with an average grain size of 26.69 µm. After processing, a geometric grain subdivision took place due to the severe plastic deformation. Processed samples were characterized by grain refinement and high density of substructures. The 4-passes sample experienced a reduction in the grain size by 92.8% compared with its AA counterpart. The fraction of high-angle grain boundaries increased significantly after 4-passes compared to the 1-pass processed sample. With regards to the crystallographic texture, the AA condition had its {0001} basal planes mostly oriented parallel to the transversal direction. On the other hand, ECAP processing resulted in crystallographic texture changes, such as the shifting of the ZK30 shear plane to be aligned at 45° relative to the extrusion direction (ED). Furthermore, the maximum texture intensity was reduced from 14 times random (AA billets) to 8 times random after ECAP processing through 4-passes. The corrosion rate of the 4-passes sample was tremendously reduced by 99% and 45.25% compared with its AA counterpart in the simulated body fluid and the NaCl solution, respectively. The pitting corrosion resistance of ZK30 showed notable improvements in the simulated body fluid by 471.66% and 352% during processing through 1-pass and 4-passes, respectively, compared with the 3.5% NaCl findings. Finally, significant improvements in the tensile strength, hardness, and ductility were also achieved.

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“…This increase is attributed to the recrystallization driven by SPD during ECAP [ 58 ]. The aforementioned findings agree with previous studies [ 19 , 58 , 59 , 60 , 61 ].…”

Section: Resultssupporting

confidence: 93%

Influence of Ultrafine-Grained Microstructure and Texture Evolution of ECAPed ZK30 Magnesium Alloy on the Corrosion Behavior in Different Corrosive Agents

et al. 2022

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“…Similar difference between the dislocation densities obtained by ECAP and MDF was observed for AM60 Mg alloy processed by SPD at 220°C. 30) In the former and latter cases, the maximum dislocation density values were ³5.6 © 10 14 m ¹2 and ³1.8 © 10 14 m ¹2 , respectively, as shown in Fig. 1.…”

Section: Dislocationsmentioning

confidence: 77%

“…1 shows the evolution of the dislocation density for Cu and AM60 Mg alloy processed by ECAP at RT and 220°C, respectively. 29,30) Saturation of the dislocation density was achieved even after 23 passes of ECAP which corresponds to an equivalent strain of about 23. For Cu, this maximum dislocation density value (³21 © 10 14 m ¹2 ) remained practically unchanged up to 10 passes, then after 15 ECAP passes the dislocation desity decreased to ³15 © 10 14 m ¹2 , corresponding to a reduction of 30%.…”

Section: Dislocationsmentioning

confidence: 99%

“…47,48) A very small difference between the saturation HAGB areas (i.e., between the minimum grain sizes) was also observed in AM60 Mg alloy processed by ECAP and MDF at 220°C. 30) At the same time, HPT-processing may result in a considerably higher HAGB area (i.e., smaller grain size) as compared to ECAP, especially for high SFE materials. Indeed, in commercially pure Al and AlMg alloys processed by HPT at RT the HAGB area was about two times higher than that obtained after ECAP.…”

Section: Grain Boundariesmentioning

confidence: 99%

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Lattice Defects and Their Influence on the Mechanical Properties of Bulk Materials Processed by Severe Plastic Deformation

Gubicza

2019

Mater. Trans.

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Processing of metallic materials by Severe Plastic Deformation (SPD) leads to the formation of many lattice defects (e.g., vacancies, dislocations, twin faults and grain boundaries). In this paper, the characteristic features of the defect structure in SPD-processed bulk metallic materials are overviewed. The influence of the material properties, such as the melting point, stacking fault energy and solute content, as well as the SPD-processing conditions (e.g., SPD route and applied hydrostatic pressure) on the type and densities of defects is discussed in detail. In addition, the effect of lattice defects on the mechanical strength of SPD-processed materials is oveviewed.

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“…ECAP equal-channel angular pressing, ECAR equal-channel angular rolling, ED electrodeposition, RCB rotational constrained bending, and MF multidirectional forging. The processing conditions of the listed materials can be found in Refs [27,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. …”

mentioning

confidence: 99%

Reliability and interpretation of the microstructural parameters determined by X-ray line profile analysis for nanostructured materials

Gubicza

2022

Eur. Phys. J. Spec. Top.

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In this overview, the applicability of X-ray diffraction line profile analysis (XLPA) for the characterization of the microstructure in nanostructured materials is overviewed. The dislocation densities obtained by whole pattern fitting and from the breadth of the diffraction peaks are compared. Both theoretical considerations and experimental evidences prove that the evaluation of the peak breadth solely is not suitable for the determination of the dislocation density. In addition, the microstructural parameters determined by XLPA were compared to the values obtained directly by microscopic methods. It was found that the ratio of the grain size obtained by microscopy and the crystallite size determined by XLPA decreases with the reduction of the grain size in nanomaterials, and below $$\sim $$ ∼ 20 nm, the two values agree within the experimental error. In addition, correlation between the microstructural parameters (e.g., crystallite size and dislocation density) determined by XLPA was not found. It was revealed that bottom–up processing methods can produce similarly high defect density in nanostructured materials as severe plastic deformation (SPD). The influence of stacking fault energy, melting point, and degree of alloying on the microstructure of nanomaterials is discussed in detail.

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A comparative study on the microstructural evolution in AM60 alloy processed by ECAP and MDF

Cited by 33 publications

References 40 publications

Influence of Ultrafine-Grained Microstructure and Texture Evolution of ECAPed ZK30 Magnesium Alloy on the Corrosion Behavior in Different Corrosive Agents

Influence of Ultrafine-Grained Microstructure and Texture Evolution of ECAPed ZK30 Magnesium Alloy on the Corrosion Behavior in Different Corrosive Agents

Lattice Defects and Their Influence on the Mechanical Properties of Bulk Materials Processed by Severe Plastic Deformation

Reliability and interpretation of the microstructural parameters determined by X-ray line profile analysis for nanostructured materials

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