Project Details
Projekt
FOR 544: Mechanical Properties and Interfaces in Ultrafine Grained Materials
Subject Area
Materials Science and Engineering
Term
from 2004 to 2010
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 5470998
Ultrafine grained (UFG) materials are attractive for many structural applications because of their interesting mechanical properties as compared with conventional materials. However, the lack of validated models appears to be one of the key roadblocks to the widespread use of these materials. Thus, the Research Unit aims at developing microstructurally based models that allow for prediction of the mechanical behaviour of UFG materials. The research will cover different alloys and production methods and employ detailed mechanical and microstructural characterisation studies in order to establish a thorough understanding of microstructure-property-relationships in UFG materials. Such a broad research programme is necessary to be able to develop validated models that can be applied to UFG materials with substantially different stress-strain behaviour and damage mechanisms.
The materials studied will be produced using severe plastic deformation (SPD) techniques, which offer several advantages over competing processes such as consolidation of nanopowders. Recent research has demonstrated that bulk material with uniform microstructures in the 200-300 nm range can now be routinely obtained using SPD techniques for a variety of alloys. However, there is a lack of systematic studies that focus on the mechanisms that govern both monotonic and cyclic stress-strain response. Moreover, new materials will be considered for many of the envisaged applications only, if the complete process route from production to mechanical behaviour under service conditions can be simulated. Consequently, the ultimate goal of the Research Unit is to develop physically based models for UFG materials, which allow to bridge the gap from basic research to engineering applications.
The materials studied will be produced using severe plastic deformation (SPD) techniques, which offer several advantages over competing processes such as consolidation of nanopowders. Recent research has demonstrated that bulk material with uniform microstructures in the 200-300 nm range can now be routinely obtained using SPD techniques for a variety of alloys. However, there is a lack of systematic studies that focus on the mechanisms that govern both monotonic and cyclic stress-strain response. Moreover, new materials will be considered for many of the envisaged applications only, if the complete process route from production to mechanical behaviour under service conditions can be simulated. Consequently, the ultimate goal of the Research Unit is to develop physically based models for UFG materials, which allow to bridge the gap from basic research to engineering applications.
DFG Programme
Research Units
Projects
- Grenzflächenstabilität und Schädigungsentwicklung in ultrafeinkörnigen Werkstoffen bei zyklischer und thermischer Beanspruchung (Applicant Maier, Hans Jürgen )
- Koordination der Forschungsgruppe 544 (Applicant Maier, Hans Jürgen )
- Kornstruktur und mechanische Eigenschaften von Kupfer und Stahl nach extremer plastischer Verformung mittels ECAP (Applicant Estrin, Yuri )
- Stabilität und Optimierung der mechanischen Eigenschaften ultrafeinkörniger Werkstoffe (Applicant Göken, Mathias )
- Thermische Stabilität massiver ultrafeinkörniger Werkstoffe (Applicant Gottstein, Günter )
- Untersuchung des Einflusses der Korntopologie auf die Eigenschaften ultrafeinkörniger Werkstoffe mit Hilfe der 3D Mikroskopie. (Applicant Raabe, Dierk )
- Werkstoffwissenschaftliche Untersuchungen zum Einfluss ultrafeinkörniger Gefüge auf die martensitische Phasenumwandlung und auf die funktionalen Eigenschaften von NiTi-Formgedächtnislegierungen (Applicant Frenzel, Jan )
Spokesperson
Professor Dr.-Ing. Hans Jürgen Maier
Deputy
Professor Dr. Yuri Estrin
