An Overview on the Continuous Severe Plastic Deformation Methods

Faraji, Ghader; Torabzadeh, H.

doi:10.2320/matertrans.mf201905

Cited by 47 publications

(20 citation statements)

References 135 publications

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“…The main drawback of ECAP, HPT, and HE is the need for expensive, specialist facilities, which significantly reduces the opportunity of scaling up these methods. [26] Therefore, one current trend is to modify the typical methods of deformation such as cold rolling [27] to refine Ti grains to the nanoscale. Techniques such as caliber rolling [28,29] and accumulative roll bonding (ARB) [26] meet this requirement, offering the possibility to obtain low-cost and relatively large volumes of nanograined Ti, essential for mass production.…”

Section: Grain Refinement To the Nanoscale-an Alternative To Ti6al4vmentioning

confidence: 99%

Nanostructured Bulk Titanium with Enhanced Properties—Strategies and Prospects for Dental Applications

Sotniczuk

Garbacz

2021

Adv Eng Mater

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Society is aging fast. The percentage of people aged above 65 years is forecast to rise from 12.4% (in 2000) to 23% by 2100. [1] The figures for 2030 for Europe and the United States are %20% and 30% respectively. [2] At present, almost 23% of US citizens over 65 are completely edentulous, creating great demand for dental replacements. [3] According to the compound annual growth rate (CAGR) forecast, the global dental market is expected to exceed $8 billion by the end of 2024, up from $4.46 billion in 2016. [1] Moreover, with rising life expectancy, modern implants have to serve much longer without requiring revision surgery. This is challenging, especially in the case of elderly people, who tend to suffer diseases that increase the risk of implant rejection. [2] Thus, advanced healthcare requires constant development in the design and fabrication of dental materials. Currently, commercially pure titanium (CP-Ti) is a leading metallic material in the global dental replacements market. [4] This is mainly due to its biocompatibility and high resistance to corrosion in body fluids. Those properties are governed by the presence of a passive layer on Ti surface, created by its strong tendency to oxidize. [5] Nanostructuring by large plastic deformation techniques is a promising approach to altering Ti properties that are essential for dental applications. [1,[6][7][8][9][10] While clinical trials have confirmed the successful application of dental implants fabricated from nanocrystalline Ti, [4,9] works are still ongoing to develop strategies aimed at enhancing biological response and antibacterial properties without impacting mechanical properties. [11][12][13][14] In this Review, we describe recent approaches taken to modify the properties of nanocrystalline Ti for biomedical applications. Our study focuses on the following aspects: (i) improving biomedical nano Ti properties through bulk and surface modifications, and (ii) the effect of microstructural changes induced by processing of nano Ti on the results of modifications. This analysis is prefaced by a brief description of the effect of nanostructure on Ti mechanical and functional properties.

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Section: Grain Refinement To the Nanoscale-an Alternative To Ti6al4vmentioning

confidence: 99%

Nanostructured Bulk Titanium with Enhanced Properties—Strategies and Prospects for Dental Applications

Sotniczuk

Garbacz

2021

Adv Eng Mater

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“…Many SPD methods were developed during the past three decades [9], but the concept of Equal Channel Angular Drawing (ECAD) [10] represents the most successful SPD technique for continuous production of ultra-fine-grained materials with homogeneous equiaxial microstructure.…”

Section: Introductionmentioning

confidence: 99%

Finite element modelling of microstructural changes during equal channel angular drawing of pure aluminium

Caruso

Imbrogno

2021

Int J Adv Manuf Technol

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Grain refinement by severe plastic deformation (SPD) techniques, as a mechanism to control microstructure (recrystallization, grain size changes,…) and mechanical properties (yield strength, ultimate tensile strength, strain, hardness variation…) of pure aluminium conductor wires, is a topic of great interest for both academic and industrial research activities. This paper presents an innovative finite element (FE) model able to describe the microstructural evolution and the continuous dynamic recrystallization (CDRX) that occur during equal channel angular drawing (ECAD) of commercial 1370 pure aluminium (99.7% Al). A user subroutine has been developed based on the continuum mechanical model and the Hall-Petch (H-P) equations to predict grain size variation and hardness change. The model is validated by comparison with the experimental results and a predictive analysis is conducted varying the channel die angles. The study provides an accurate prediction of both the thermo-mechanical and the microstructural phenomena that occur during the process characterized by large plastic deformation.

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“…In this context, SPD processes are recognized as the main techniques to achieve microstructural changes and material strengthening by recrystallization. Many SPD methods were developed during the last years [17] but the concept of Equal Channel Angular Drawing (ECAD) [18] represents the most successful SPD technique for continuous production with homogeneous microstructure (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Sustainable manufacturing of ultra-fine aluminium alloy 6101 wires using controlled high levels of mechanical strain and finite element modeling

Caruso

Filice

2021

Int J Mater Form

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The evolution of grain size and component mechanical behaviour are fundamental aspects to analyse and control when manufacturing processes are considered. In this context, severe plastic deformation (SPD) processes, in which a high shear strain is imposed on the material, are recognized as the main techniques to achieve microstructural changes and material strengthening by the recrystallization, attracting both academic and industrial investigation activities. At the same time, nowadays, sustainable manufacturing design is one of the main responsibilities of the researchers looking at UN2030 agenda and the modern industrial paradigms. In this paper a new severe SPD process is proposed with the aim to steer manufacturing to fourth industrial revolution using some of Industry 4.0 pillars. In particular, additive manufacturing (AM) and numerical simulations were setup as controlling and monitoring techniques in manufacturing process of wires. Strengthening effect (yield and ultimate tensile strength, plasticity and hardness) and microstructural evolution (continuous dynamic recrystallization -CDRX-) due to severe plastic deformation were experimentally analysed and numerically investigated by an innovative finite element (FE) model able to validate the effectiveness of a properly modified process for ultra-fine aluminium alloy AA6101 wires production designed with the aim to avoid any post manufacturing costly thermal treatment. The study provides an accurate experimental study and numerical prediction of the thermo-mechanical and microstructural phenomena that occur during an advanced large plastic deformation process; it shows how the combination of smart manufacturing and simulations control represents the key to renew the traditional manufacturing methods in the perspective of the Industry 4.0, connecting and integrating the manufacturing process for the industrial evolution in production.

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An Overview on the Continuous Severe Plastic Deformation Methods

Cited by 47 publications

References 135 publications

Nanostructured Bulk Titanium with Enhanced Properties—Strategies and Prospects for Dental Applications

Nanostructured Bulk Titanium with Enhanced Properties—Strategies and Prospects for Dental Applications

Finite element modelling of microstructural changes during equal channel angular drawing of pure aluminium

Sustainable manufacturing of ultra-fine aluminium alloy 6101 wires using controlled high levels of mechanical strain and finite element modeling

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