Evolution of long-period stacking ordered structure and hardness of Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy during processing by high pressure torsion

Sun, Wanting; Qiao, Xiaoguang; Zheng, M.Y.; Hu, Nan; Gao, Nong; Starink, M.J.

doi:10.1016/j.msea.2018.09.063

Cited by 41 publications

(11 citation statements)

References 57 publications

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“…Severe plastic deformation (SPD) can improve the mechanical properties of metallic materials via grain refinement into the sub‐micrometer or even nanometer regimes . In addition to the improved strength, SPD processing can result in strain‐induced phase transformations.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the improved strength, SPD processing can result in strain‐induced phase transformations. For example, structure refinement by SPD processing can produce dissolution of secondary phases or precipitates in many metallic alloys . Previous studies on SPD‐processed Ti–6Al–4V alloys have revealed the dissolution of β phase and the generation of supersaturated single α‐phase alloys .…”

Section: Introductionmentioning

confidence: 99%

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Homogeneous Anodic TiO₂ Nanotube Layers on Ti–6Al–4V Alloy with Improved Adhesion Strength and Corrosion Resistance

Gao

et al. 2019

Adv Materials Inter

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and superior properties, which are cost-effective [1] and found many applications in photocatalytic devices, [2,3] electronic devices, [4] solar cells, [5] sensors, [6] as well as biomedical implants. [7,8] As coatings on biomedical implants, TNT layers have been reported to affect the cellular behavior such as adhesion, [9] migration, [7] proliferation, [7,10] and differentiation. [11] Nevertheless, TNT coatings are normally deposited on pure titanium substrates rather than Ti alloys because TNT layers fabricated on Ti alloys are usually inhomogeneous. Most Ti alloys used in biomedical applications have a binary-phase α/β microstructure, [12] of which the α phase has a hexagonal close-packed crystallographic structure containing α-stabilizing elements like Al, O, and N, whereas the β phase with a body-centered cubic structure is enriched with β-stabilizing elements such as Nb, V, Mo, Ta, and Zr. [13] It is difficult to produce uniform nanotube arrays on multiple-phase substrates due to the diverse chemical reactivities of different phases. For example, one phase can be oxidized or etched preferentially by the electrolyte, [14] and hence the nanotube layers formed on Hexagonal TiO 2 nanotubes (TNTs) arrays are generally fabricated on Ti-based substrates for some biomedical purposes, but the TNT layers constructed on conventionally processed Ti alloys are usually inhomogeneous because the substrates typically contain both the α and β phases. In this work, high-pressure torsion (HPT) is applied to obtain a saturated single α-phase microstructure in Ti-6Al-4V alloys via strain-induced β phase dissolution. Homogeneous anodic TNT layers with three different morphologies, one-step nanoporous, one-step nanotubular, and two-step nanoporous structures, are electrochemically fabricated on the ultrafine-grained (UFG) Ti-6Al-4V alloy substrates after HPT processing, whereas the TNT layers prepared on coarsegrained substrates are normally inhomogeneous. More notably, the TNT layers show significantly improved adhesion strength to the UFG substrate as well as better corrosion resistance compared to those on the conventionally processed Ti-6Al-4V substrates. X-ray diffraction analysis, scanning electron microscopy in combination with electron backscatter diffraction, and transmission electron microscopy indicate that the improvement is due to a larger dislocation density in the UFG substrate as well as strain-induced β phase dissolution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Homogeneous Anodic TiO₂ Nanotube Layers on Ti–6Al–4V Alloy with Improved Adhesion Strength and Corrosion Resistance

Gao

et al. 2019

Adv Materials Inter

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“…According to the Hall-Petch criterion, the mechanical properties of the materials are closely related to the grain size [34]. Furthermore, the influence of the Schmid factor could not be ignored [10].…”

Section: Schmid Factor Evolution Of Three Slip Systems During Canningmentioning

confidence: 99%

Study on Microstructure Evolution and Mechanical Properties of Ti2AlNb-Based Alloy under Canning Compression and Annealing

Wang

Sun

et al. 2019

Metals

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The influence of height reduction on the microstructure evolution and mechanical properties of the Ti2AlNb-based alloy was investigated during canning compression and subsequent annealing. After the annealing treatment, the spheroidized B2 phase grains occurred because of partial recrystallization. Meanwhile, the texture evolution of the B2 phase and O phase were analyzed under the deformation degree, ranging from 25% to 75%. The results show that the mechanical properties of the post-annealed alloys were co-affected by the grain size and Schmid factor of the B2 phase. When the height reduction was less than 25%, the compression strength was mainly affected by the grain size. When the height reduction was higher than 50%, it was mainly dominated by the Schmid factor. When the deformation degree reached 75%, the recrystallized grain size decreased to 0.9 μm. Meanwhile, the Schmid factor of a {110}<001> slip system in B2 phase reduced to 0.34. Therefore, the yield strength of the Ti2AlNb alloy at room temperature increased from 892 MPa in the as-rolled condition to 935 MPa after the canning compression and annealing.

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“…It is now accepted that UFG and NG materials are defined as those having grain sizes in the range of 0.1–1 μm and <100 nm, respectively. Such remarkable properties are largely attributed to grain refinement and the generation of large amounts of dislocations in these grain scales, highlighting the benefit of fine grain microstructure . To date, severe plastic deformation (SPD) processing has emerged as one of the most popular techniques that can produce bulk metals with UFG and NG microstructures, including equal‐channel angular pressing (ECAP), high‐pressure torsion (HPT), and accumulative roll bonding (ARB).…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Response of Additively Manufactured 316L Stainless Steel Processed by High‐Pressure Torsion

et al. 2020

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Numerous studies have reported attractive properties in ultrafinegrained (UFG) and nanograined (NG) metals and alloys compared with their coarse-grained (CG) counterparts, including significantly higher yields and tensile strengths, [1-3] enhanced wear and corrosion resistance, [4-6] and superplasticity at room temperature (RT). [7,8] It is now accepted that UFG and NG materials are defined as those having grain sizes in the range of 0.1-1 μm and <100 nm, respectively. Such remarkable properties are largely attributed to grain refinement and the generation of large amounts of dislocations in these grain scales, highlighting the benefit of fine grain microstructure. [9,10] To date, severe plastic deformation (SPD) processing has emerged as one of the most popular techniques that can produce bulk metals with UFG and NG microstructures, including equal-channel angular pressing (ECAP), high-pressure torsion (HPT), and accumulative roll bonding (ARB). From these techniques, HPT has been shown as the most effective method to produce true NG structures with large amounts of highangle grain boundaries (GBs) via the application of concurrent compressive force and torsional straining on HPT-processed samples. [11] In contrast, additive manufacturing (AM) has now been utilized to fabricate metallic components for niche engineering applications, e.g., automotive, biomedical, and aerospace, due to its attractive features of design flexibility, time and cost savings, and minimal material waste. [12] Selective laser melting (SLM) is one of the most widely used AM methods in the laser powder bed fusion (LPBF) category. As its name implies, SLM uses laser as the heat source to selectively consolidate layers of the powder bed into a complete 3D structure according to the initial computer-aided design (CAD) data. To date, a wide range of alloys have been used to fabricate metallic components using SLM, including 316L stainless steel (316L SS), Inconel 718 (IN 718), AlSi 10 Mg, and Ti6Al4V. [13,14] So far, research on metal AM has focused on optimizing processing parameters to achieve the highest densification levels with minimal porosity or defect contents. [15-28] To minimize

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Evolution of long-period stacking ordered structure and hardness of Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy during processing by high pressure torsion

Cited by 41 publications

References 57 publications

Homogeneous Anodic TiO₂ Nanotube Layers on Ti–6Al–4V Alloy with Improved Adhesion Strength and Corrosion Resistance

Homogeneous Anodic TiO₂ Nanotube Layers on Ti–6Al–4V Alloy with Improved Adhesion Strength and Corrosion Resistance

Study on Microstructure Evolution and Mechanical Properties of Ti2AlNb-Based Alloy under Canning Compression and Annealing

Micromechanical Response of Additively Manufactured 316L Stainless Steel Processed by High‐Pressure Torsion

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Evolution of long-period stacking ordered structure and hardness of Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy during processing by high pressure torsion

Cited by 41 publications

References 57 publications

Homogeneous Anodic TiO2 Nanotube Layers on Ti–6Al–4V Alloy with Improved Adhesion Strength and Corrosion Resistance

Homogeneous Anodic TiO2 Nanotube Layers on Ti–6Al–4V Alloy with Improved Adhesion Strength and Corrosion Resistance

Study on Microstructure Evolution and Mechanical Properties of Ti2AlNb-Based Alloy under Canning Compression and Annealing

Micromechanical Response of Additively Manufactured 316L Stainless Steel Processed by High‐Pressure Torsion

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Product

Resources

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Homogeneous Anodic TiO₂ Nanotube Layers on Ti–6Al–4V Alloy with Improved Adhesion Strength and Corrosion Resistance

Homogeneous Anodic TiO₂ Nanotube Layers on Ti–6Al–4V Alloy with Improved Adhesion Strength and Corrosion Resistance