The role of pyramidal 〈  +  〉 dislocations in the grain refinement mechanism in Ti-6Al-4V alloy processed by severe plastic deformation

Wang, Chenglin; Yu, Dapeng; Niu, Zhiqiang; Zhou, Wenlong; Chen, Guoqing; Li, Zhiqiang; Fu, Xuesong

doi:10.1016/j.actamat.2020.08.076

Cited by 88 publications

(11 citation statements)

References 76 publications

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“…Additionally, the relative intensity of the peak at 38°, corresponding to the (

) plane [ 38 ], is lower for Ti-6Al-4V than CP-Ti. This can be associated with a prismatic texture of Ti-6Al-4V, where a higher plastic deformation results in lower peak intensity [ 39 , 40 , 41 ]. This influence is also observed at 53°, 63°, 71° and 77°, which can be related to heat treatment, as described by Beladi et al [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

A Tribological and Ion Released Research of Ti-Materials for Medical Devices

et al. 2021

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The increase in longevity worldwide has intensified the use of different types of prostheses for the human body, such as those used in dental work as well as in hip and knee replacements. Currently, Ti-6Al-4V is widely used as a joint implant due to its good mechanical properties and durability. However, studies have revealed that this alloy can release metal ions or particles harmful to human health. The mechanisms are not well understood yet and may involve wear and/or corrosion. Therefore, in this work, commercial pure titanium and a Ti-6Al-4V alloy were investigated before and after being exposed to a simulated biological fluid through tribological tests, surface analysis, and ionic dissolution characterization by ICP-AES. Before exposure, X-ray diffraction and optical microscopy revealed equiaxed α-Ti in both materials and β-Ti in Ti-6Al-4V. Scratch tests exhibited a lower coefficient of friction for Ti-6Al-4V alloy than commercially pure titanium. After exposure, X-ray photoelectron spectroscopy and surface-enhanced Raman spectroscopy results showed an oxide film formed by TiO2, both in commercially pure titanium and in Ti-6Al-4V, and by TiO and Al2O3 associated with the presence of the alloys. Furthermore, inductively coupled plasma atomic emission spectroscopy revealed that aluminum was the main ion released for Ti-6Al-4V, giving negligible values for the other metal ions.

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“…Additionally, the relative intensity of the peak at 38°, corresponding to the (

Section: Resultsmentioning

confidence: 99%

A Tribological and Ion Released Research of Ti-Materials for Medical Devices

et al. 2021

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“…The possible deformation mechanisms during SURT involved twinning and dislocation motion. [26][27][28][29]36 With the increase of strain, the initial coarse-grains were first refined into laminated grains and then equiaxed nanograins, forming a gradient structure on the surface.…”

Section: Resultsmentioning

confidence: 99%

“…The remarkably enhanced corrosion resistance of GNG Ti and GNG Cu/Ti can be attributed to the fact that the GNG surface of titanium facilitates the formation of an oxide protective film. 28,40,41 It is noted that the corrosion resistance of GNG Cu/Ti was slightly inferior to that of GNG Ti, which might be due to the mild coarsening of nanograins during the copperizing process. 3.5.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in the corresponding SAED pattern (inset of Figure c), the discontinuous distribution of elongated spots along diffraction rings implied that the lamellae were separated by low-angle grain boundaries. The possible deformation mechanisms during SURT involved twinning and dislocation motion. − , With the increase of strain, the initial coarse-grains were first refined into laminated grains and then equiaxed nanograins, forming a gradient structure on the surface.…”

Section: Resultsmentioning

confidence: 99%

“…Since a large number of grain boundaries in nanograined materials can act as channels for rapid atomic diffusion, , a gradient nanograined (GNG) surface layer fabricated by surface nanocrystallization technology can significantly accelerate the diffusion kinetics, thereby reducing the processing temperature and/or duration. − At the same time, low-temperature alloying, in turn, reduces the coarsening of nanograins, thus retaining the superior properties of GNG Ti. − However, the GNG layers obtained by commonly used surface attrition mechanical treatment (SMAT) − or shot peening (SP) − were relatively rough and unevenly deformed, which is detrimental to the subsequent copperizing process. In recent years, surface ultrasonic rolling treatment (SURT), as a novel technology utilizing ultrasonic vibrations superimposed on rolling, has been applied to induce a uniform deformation layer with a good surface finish, − thus facilitating the subsequent copperizing process.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Physicochemical and Biological Properties of a Low-Temperature Copperized Layer on Gradient Nanograined Pure Titanium

Qiu

Pan

Peng

et al. 2021

ACS Appl. Bio Mater.

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The application of titanium as medical implants is limited to a certain extent due to its insufficient corrosion resistance, biological activity, and antibacterial ability. In this work, a gradient nanograined (GNG) layer was fabricated on the titanium surface by surface ultrasonic rolling treatment (SURT). The subsequent copperizing kinetics was greatly enhanced so that a thick copperized layer could be obtained on the surface of GNG Ti at a relatively low diffusion temperature (450 °C). Meanwhile, the GNG structure accelerated the release rate of Cu2+, which endows GNG Cu/Ti with strong antibacterial activity. Moreover, the corrosion resistance and cytocompatibility of GNG Cu/Ti were also evidently improved compared with coarse-grained Ti, indicating a good biomedical application prospect.

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Discovering Pyramidal Treasures: Multi‐Scale Design of High Strength–Ductility Titanium Alloys

Wei,

Kim,

Foltz

et al. 2024

Advanced Materials

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Mechanical properties of titanium alloys, one of humankind's most essential structural materials, suffer from the lack of 〈c + a〉 dislocations on pyramidal slip planes, failing homogeneous plastic strain accommodation. This mechanical treasure is not easily accessible in titanium alloys because of the required excessively high stress levels. The present work demonstrates that such a dilemma may be overcome by meticulously tuning the c/a ratio, the simplest crystallographic parameter of the hexagonal close‐packed lattice, through Sn alloying. Combing this lattice‐scale design concept with a cross‐rolling based polycrystal‐scale design solution, this study showcases a facile route to bimodal (α+β) titanium alloys with unprecedented strength‐ductility synergy.This article is protected by copyright. All rights reserved

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The role of pyramidal 〈 + 〉 dislocations in the grain refinement mechanism in Ti-6Al-4V alloy processed by severe plastic deformation

Cited by 88 publications

References 76 publications

A Tribological and Ion Released Research of Ti-Materials for Medical Devices

A Tribological and Ion Released Research of Ti-Materials for Medical Devices

Enhanced Physicochemical and Biological Properties of a Low-Temperature Copperized Layer on Gradient Nanograined Pure Titanium

Discovering Pyramidal Treasures: Multi‐Scale Design of High Strength–Ductility Titanium Alloys

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