Лекция ведущего ученого на тему - Nanostructuring Metallic Materials by Severe Plastic Deformation Methods

 Nanostructuring Metallic Materials by Severe Plastic Deformation Methods
J. M. Cabrera
Universidad Politécnica de Cataluña, Dept Ciencia de Materiales e Ing. Metalúrgica,
EEBE- c/Eduard Maristany 10-14, 08017 - Barcelona, Spain.
email: jose.maria.cabrera@upc.es

8 June 2018, meeting room B-607 at 2:30 p.m.

Keywords: nanostructured metals, severe plastic deformation, steel, copper, titanium

Severe plastic deformation techniques have become a mature metal processing method able to produce nanostructured metals in massive amounts. It is well known that heavy deformation can result in significant refinement of microstructure at low temperatures. However, the amount of material or the structures formed shows diverse disadvantages. Particularly final structures are usually substructures of a cellular type having boundaries with low angle misorientation, and the thickness of final products may limit their applicability. Nevertheless, the nanostructures formed from SPD are ultra fine-grained structures of a granular type containing mainly high angle grain boundaries, and certain SPD methods, such as Equal Channel Angular Pressing (ECAP) can produce large amount of materials, i.e. bulk materials without heavy limitation in dimensions.

Methods of severe plastic deformation should follow some requirements: First, it is important to obtain ultra fine-grained structures with prevailing high-angle grain boundaries. Second, the formation of nanostructures uniform within the whole volume of a sample is necessary for providing stable properties of the processed materials. And third, samples should not have any mechanical damage or cracks. Traditional methods of severe plastic deformation, such as rolling, drawing or extrusion cannot meet these requirements.

It has been pointed out the mechanical benefits obtained in materials undergoing SPD: significant increments in strength keeping acceptable ductility. From that point of view, a very interesting way to increase mechanical properties is offered. No heat treatments of alloying elements must be introduced into the original material. However, the industrials application where the nanostructured bulk metals are called to play a major role are those related with bi- or multi-functionality of a given material, that is, to increase mechanical properties without penalty on other characteristics (such us physical properties, biocompatibility, forming capacity or weldability).

Present work is devoted to summarize some possibilities that the ECAP technique offers to researchers and engineers, and to show three examples of industrial application of the latter SPD technique, namely, an electrolytic copper for power cables with high mechanical properties and high electrical conductivity, pure titanium as a high strength biomaterial, and very low carbon steel of high strength and high weldability

José María Cabrera Marrero, was born on December 8th, 1964 in Santa Cruz de Tenerife, Canary Islands, Spain. He holds a PhD in Industrial Engineering from the Polytechnic University of Catalonia (UPC), that was awarded as PhD Prize (1995) by the Faculty of Industrial Engineering of Barcelona. Also, its final grade project was awarded first prize (1992) by the College and Association of Industrial Engineers of Catalonia. He has been the recipient of a scholarship to follow PhD studies (1992-1995) and a postdoctoral grant (1995-1996) from the Generalitat de Catalunya. He has performed research stays at McGill University (Montreal), National Polytechnic Institute of Mexico City, UNAM (Mexico), UANL (Mexico) and UFSCarlos (Brazil).
He is currently Full Professor in the Department of Materials Science and Metallurgical Engineering of the UPC, being secretary of that department. He lectures on Materials Technology, Materials Selection in Mechanical Design and Metallic Materials at the Engineering Faculty of UPC. He has also given many courses in the area in Spain, Europe, and especially in Latin America (Mexico, Argentina, Venezuela, Chile and Colombia).
He has participated in more than 50 research projects (leading 30) financed by competitive public funding and directly by companies.
His area of expertise is aimed at characterizing the plastic deformation behavior of metals, mainly at high temperature. It has also been recently aimed at obtaining ultrafine structures and nano grained metallic materials by severe plastic deformation processes (equal channel angular pressing and mechanical alloying). His work in the area has earned him more than 2700 citations in scientific literature.
He has been supervisor of 17 PhD theses and 35 Final Year Projects and Master Thesis of Engineering. He has authored 185 communications in scientific journals, and around 300 communications in international and national conferences. He has been plenary lecture on 10 occasions. He has given lectures, talks and courses at universities, institutes and companies in Spain, France, England, Germany, Belgium, Greece, Mexico, Argentina, Colombia, Chile, Venezuela and Brazil
Researcher ID: D-5212-2014, ORCID Code: 0000-0001-8417-1736
Research activity can be publically followed thorough webs: researchgate.net and Google Scholar (jm cabrera-marrero)
h-index h=28 (Google)

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