R&amp;D of NanoSPD Materials in Ufa via International Cooperation

Reshetnikova, Natalya A.; Salakhova, Milyausha R.; Safargalina, Zarema A.; Scherbakov, A.V.

doi:10.4028/www.scientific.net/msf.584-586.9

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…These properties suggest the obvious applications of UFG metals in high performance, lightweight components [14] but also in technological processes such as low temperature/high strain rate superplastic forming [15]. Other applications just take advantage of the small grain size and the increased amount of grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Incremental Equal Channel Angular Pressing for Grain Refinement

Rosochowski¹,

Olejnik

2011

MSF

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Creating a small amount of ultrafine grained metals by severe plastic deformation, for example using equal channel angular pressing, is possible in many research laboratories. However, industrial production of these materials is lagging behind because of the lack of industrially viable severe plastic deformation processes. One attempt to change this situation is based on the concept of incremental equal channel angular pressing developed by the University of Strathclyde and Warsaw University of Technology. The paper describes the path the researchers took to develop the process starting from finite element simulation, through tool design and process implementation, to material characterisation. Examples of various process configurations, which enable obtaining UFG bars, plates and sheets are given and possible future developments discussed.

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Section: Introductionmentioning

confidence: 99%

Incremental Equal Channel Angular Pressing for Grain Refinement

Rosochowski¹,

Olejnik

2011

MSF

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“…A different situation exists in the sports equipment industry, where performance is sometimes more important than cost. Therefore, initial attempts have been made to use UFG metals in high-performance bicycles (Reshetnikova et al , 2008) and in the faceplate of a golf club head (Safi ullin et al , 2009). The next few examples refer to advantages of UFG metals other than high strength; high strength may still be desirable, but it is not the main reason for using UFG metals in these applications.…”

Section: Structural Elementsmentioning

confidence: 99%

Severe plastic deformation for grain refinement and enhancement of properties

Rosochowski

Olejnik

2012

Microstructure Evolution in Metal Forming Processes

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“…For example, a UFG Ti axle for the bottom bracket of a bicycle was 27% lighter than the original part made of CG Ti and 62% lighter than the same part made of a stainless steel. 21 Since the UFG part was also stronger, its life was substantially extended. An interesting opportunity opens up for UFG magnesium, which is one of the materials being considered for dissolvable cardiovascular stents.…”

Section: Applications Of Ufg Metalsmentioning

confidence: 99%

“…The first commercial application has been reported by a Czech company, Timplant, which makes UFG titanium dental screws. 21 The good mechanical properties of the material enable reduction of the screw diameter from 3.5 to 2.4 mm, making it more appropriate for front teeth and dental implants for children. Some studies have shown that in the case of UFG metals the bone integration rate is up to 20 times faster than that for conventional metals; patients should experience shorter post-surgery healing times and more reliable integration of these new implants into their body.…”

Section: Applications Of Ufg Metalsmentioning

confidence: 99%

Ultrafine grains – a new option for light metals

Rosochowski

Olejnik

2009

Materials Technology

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The potential of ultrafine grained light metals is reviewed. The fundamental metallurgical processes, microstructures developed and properties obtained are first considered. Methods employing severe plastic deformation to achieve ultrafine structures are described and the obstacles to their industrial scale exploitation discussed. Recent advances include the incremental equal channel angular pressing (I-ECAP) process developed at the University of Strathclyde. Ultrafine grained materials are currently utilised in sputtering targets and high value medical devices, but large potential markets exist in the leisure and sports sectors, and in the longer term for aerospace and automotive applications.Users of metals often treat them as continuous bodies to be formed or machined and often forget that metals are made of grains: discrete domains of different lattice orientation. The polycrystalline nature of metals is too frequently viewed as a 'hidden feature', decided during metallurgical processing and thus remaining beyond the influence of most users converting metals into products. However, this perception may be changed by a new technology, which is much closer to the reach of traditional metals converters. Known as severe plastic deformation (SPD), it is capable of refining the coarse grained (CG) structure of metals and alloys to an average grain size of less than 1 µm. SPD is a top-down method of producing bulk ultrafine grained (UFG) metals, contrary to the bottom-up methods based on consolidation of nanoparticles. UFG metals possess a range of interesting properties, which make them attractive for advanced applications. Grain refinement by severe plastic deformationThe mechanism of grain refinement by SPD is still under investigation. However, the general view is that refinement results from the non-uniform distribution of dislocations, which tend to form cell structures within the original coarse grains. Another opinion emphasises the role of shear bands (thin bands of localised shear deformation) where different bands cross each other to create a pattern resembling a chessboard. The distance between shear bands is very small, which leads to the creation of dislocation cells having sub-micrometre dimensions. The dislocation cells, which do not initially have very different crystallographic orientation from their neighbours, are referred to as subgrains. Only when their misorientation angle exceeds 15°, are they treated as distinct grains. To achieve this state, severe plastic deformation is required. The average grain size of the UFG metals produced depends on the SPD parameters (strain, temperature, pressure) and on the material used; for pure metals, grains tend to be larger, e.g. 0.6 µm for aluminium 1070 (Fig. 1), whereas alloys respond better, e.g. 0.2 µm for Al 5083 under similar processing conditions. Sometimes, the average grain size achieved by SPD can reach the nanometre level (<0.1 µm) as in the case of nickel subjected to SPD at high pressure. The nanostructuring mechanism described is universal f...

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R&D of NanoSPD Materials in Ufa via International Cooperation

Cited by 3 publications

References 6 publications

Incremental Equal Channel Angular Pressing for Grain Refinement

Incremental Equal Channel Angular Pressing for Grain Refinement

Severe plastic deformation for grain refinement and enhancement of properties

Ultrafine grains – a new option for light metals

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