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Closed Projects

This project was a joint collaboration between Tata Steel and the SN department with the aim of performing quantitative characterisation of multi-phase precipitates in grain oriented electrical steel (GOES) using high-resolution chemical composition mapping by means of Energy-Filtering Transmission Electron Microscopy (EF-TEM). [more]
Nb-based intermetallic alloys consisting of Nb solid solution and high-melting, strengthening intermetallic phases are of considerable interest for structural applications at very high temperatures. [more]
TiAl-based alloys currently mature into application. Sufficient strength at high temperatures and ductility at ambient temperatures are crucial issues for these novel light-weight materials. By generation of two-phase lamellar TiAl + Ti3Al microstructures, these issues can be successfully solved. Because oxidation resistance at high temperatures is still a problem which could be improved by increasing the Al content, Al-rich TiAl alloys have recently come into focus. [more]
Deviations from the ideal, stoichiometric composition of tcp (tetrahedrally close-packed) intermetallic phases as, e.g., Laves phases can be partially compensated by point defects like antisite atoms or vacancies, but also planar defects may offer an opportunity to accommodate excess atoms. [more]
The Ni- and Co-based γ/γ’ superalloys are famous for their excellent high-temperature mechanical properties that result from their fine-scaled coherent microstructure of L12-ordered precipitates (γ’ phase) in an fcc solid solution matrix (γ phase). The only binary Co-based system showing this special type of microstructure is the Co-Ti system, where the Co solid solution is the γ phase and TiCo3 the L12-ordered γ’ phase. [more]
This project focused on the interface between dielectric materials and different metals. [more]
Copper structures in microelectronic devices have to fulfill two important requirements, a high electrical and thermal conductivity. However, the lifetime is determined by the static and dynamic mechanical properties of the Cu structures. [more]
The project in the scope of research activities of the Advanced Transmission Electron Microscopy group has two main objectives: (i) epitaxial thin film deposition and (ii) in-situ TEM tensile experiments. [more]
Understanding the mechanical behavior and microstructure correlation of copper-chromium films is of paramount importance both from scientific and technological perspectives. [more]
Fusion is one of the most promising safe, emissionless and limitless sources of energy. The extreme conditions in a fusion reactor, require the development of novel materials to withstand high temperature ion irradiation and at the same time provide sufficient mechanical stability. [more]
The mechanical response of miniaturized material systems strongly depends on the sample size. Macroscopically well documented material properties like the yield stress or the hardening rate are changing when the smallest sample dimension reaches the micrometer range. [more]
The research focused on the mechanical behaviour of nanostructured materials and the deformation mechanisms underlying the outstanding mechanical properties with respect to their microstructure. [more]
A structural hierarchy due to chemical ordering, dimensionality and spatial arrangement of the constituent phases was obtained in a precipitation strengthened ferritic alloy. Nearest-neighbor ordered B2-NiAl precipitates were coherently embedded in the disordered bcc-Fe matrix. Throughout the solid-state aging heat treatment a coherent substructure of the next-nearest-neighbor ordered L21-Ni2TiAl phase formed only within the primary B2-NiAl precipitates. [more]
The objective of this large-scale collaborative research project is the development of intermetallic materials for application in large diesel ship engines. [more]
The segregation of impurities to grain boundaries (GBs) has a significant influence on the cohesive properties, atomic arrangements and properties of such interfaces. The segregation strongly depends on the structural units of the GB as well as on the impurity atom itself. Aberration–corrected (S)TEM techniques in combination with atomistic simulations are applied to unravel the connection of grain boundary structure and chemistry at atomic resolution. [more]
Focus: The research focused on testing the reliability of various novel fracture toughness test geometries at the small length scales using in-situ fracture tests in the SEM. [more]
Ferritic superalloys are an attractive alternative to Cr-rich martensitic steels or Ni-based superalloys for high-temperature applications in thermal power plants due to their excellent mechanical properties, oxidation resistance and low density. Strengthening of the Fe-matrix by coherent B2-NiAl precipitates leads to an increase in creep resistance up to temperatures of 700 ºC and stresses of 100 MPa. [more]
Focus: Role of the interface in the deformation and fracture behavior of nanolaminate metallic systems have been studied in-situ in the SEM. [more]
Carbon(C)-containing martensitic steels are ideal candidates for high-strength applications, e.g. in automotive and aerospace applications, due to their excellent mechanical properties and low cost. Carbon can even redistribute at room temperature leading to the formation of nanoscale carbides that can significantly influence the mechanical properties. [more]
The focus lies on the analysis of the mechanical behavior and their underlying deformation mechanisms in new ductile solid solution Mg alloys by performing micromechanical experiments with electron microscopy analyses. [more]
Driven by increasing reliability requirements in automotive microelectronics and severe restrictions on lead-containing solders, recent research is focused on the examination of failure mechanisms in lead-free solder joints. [more]
The production of reliable flexible electronic devices are believed to be a future key-technology. The material systems thereby suffer from various loading conditions (e.g. temperature variation, monotone and cyclic strains,…). The pronounced differences in mechanical behavior between metal and polymer makes film/substrate systems prone to failure. [more]
Experimental studies of the interfacial adhesion and interfacial fracture strength (energy release rate) are crucial to pave the way for mechanically and thermo-mechanically robust and reliable electronic devices. Our research mission is to examine the adhesion and fracture strength of interfaces between dissimilar materials. [more]
The development of nanostructured metals and alloys with superior mechanical properties is of paramount importance for both, a fundamental scientific understanding of the structure property relationship of materials and future technological applications in modern micro- and nanotechnologies. [more]
By combining advanced characterization and mechanical testing of microsized, single-phase intermetallic samples through in situ micromechanical experiments inside an SEM or TEM, the mechanical response can be measured while simultaneously observing the microstructural changes. From these experiments, it is expected to get a much deeper insight in the complicated deformation mechanism of intermetallic phases, which is very much different from that in pure metals. [more]
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