Welsch, E. D.; Haghighat, S. M. H.; Gutiérrez-Urrutia, I.; Raabe, D.: Investigation of nano-sized kappa carbide distribution in advanced austenitic lightweight high-Mn steels by coupled TEM and DDD simulations: Strengthening and dislocation-based mechanisms. 2nd International Conference on High Manganese Steels, Aachen, Germany (2014)
Haghighat, S. M. H.; Eggeler, G. F.; Raabe, D.: Mesoscale modelling of the influence of loading conditions on the dislocation mobility and creep process in single crystal Ni base superalloys. KTH Stockholm-Sweden, Stockholm, Sweden (2014)
Haghighat, S. M. H.; Eggeler, G.; Raabe, D.: Discrete Dislocation Dynamics Study of Creep Anisotropy in Single Crystal Ni Base Superalloys. MRS Fall Meeting, Bosten, USA (2013)
Haghighat, S. M. H.; Schäublin, R.; Raabe, D.: Molecular Dynamics Study of Obstacle Induced Hardening; From Nano-Sized Defects to Binary Junction. MRS Fall Meeting, Bosten, MA, USA (2013)
Haghighat, S. M. H.; Schäublin, R.; Raabe, D.: Atomistic study of forest hardening through binary dislocation junction in bcc-iron. 2013 MRS Spring Meeting, San Francisco, CA, USA (2013)
Haghighat, S. M. H.; Eggeler, G.; Raabe, D.: Discrete dislocation dynamics modeling of loading orientation effect on the low stress creep of single crystal Ni base superalloys. Intermetallics 2013, Bad Staffelstein, Germany (2013)
Haghighat, S. M. H.; Eggeler, G.; Raabe, D.: Primary creep of Ni base supealloys used in hot gas turbine blades. Alstom Company, Baden, Switzerland (2012)
Haghighat, S. M. H.; Eggeler, G.; Raabe, D.: Dislocation dynamics modeling of the glide-climb mobility of a ½ a0<110>{111} dislocation in interaction with γ’ precipitate in Ni-based superalloy. 4th International Conference on Dislocations, Budapest, Hungary (2012)
Haghighat, S. M. H.; Schäublin, R.: Perspective of multiscale simulation approach in the development of novel materials. Tarbiat Modares University, Tehran, Iran (2012)
Haghighat, S. M. H.; Schäublin, R.: Atomistic simulation and transmission electron microscopy of obstacle strengthening in iron. Sahand University of Technology, Tabri, Iran (2012)
Haghighat, S. M. H.; von Pezold, J.; Neugebauer, J.; Raabe, D.: Effect of local stress state on the glide of ½a₀<111> screw dislocation in bcc-Fe. 1st Austrian-German Workshop on Computational Materials Design, Kramsach, Austria (2012)
Schäublin, J.; Haghighat, S. M. H.: Simulation of the screw dislocation mobility in Fe by molecular dynamics. E-MRS Spring Meeting, Nice, France (2011)
Haghighat, S. M. H.; Schäublin, R.: Dislocations mechanisms in bcc-Fe; from atomistic to TEM observation. Workshop on ab initio Description of Iron and Steel: Mechanical properties, Ringberg Castle, Germany (2010)
Haghighat, S. M. H.; Reed, R. C.; Raabe, D.: Modeling of dislocation mechanisms and the influence of the γ/γ´lattice misfit on the dislocation assisted creep of high temperature Ni-base superalloys. 7th International Conference on Multiscale Materials Modeling , Berkeley, CA, USA (2014)
Hydrogen in aluminium can cause embrittlement and critical failure. However, the behaviour of hydrogen in aluminium was not yet understood. Scientists at the Max-Planck-Institut für Eisenforschung were able to locate hydrogen inside aluminium’s microstructure and designed strategies to trap the hydrogen atoms inside the microstructure. This can…
For understanding the underlying hydrogen embrittlement mechanism in transformation-induced plasticity steels, the process of damage evolution in a model austenite/martensite dual-phase microstructure following hydrogenation was investigated through multi-scale electron channelling contrast imaging and in situ optical microscopy.
We will investigate the electrothermomechanical response of individual metallic nanowires as a function of microstructural interfaces from the growth processes. This will be accomplished using in situ SEM 4-point probe-based electrical resistivity measurements and 2-point probe-based impedance measurements, as a function of mechanical strain and…
Hydrogen induced embrittlement of metals is one of the long standing unresolved problems in Materials Science. A hierarchical multiscale approach is used to investigate the underlying atomistic mechanisms.
This project will aim at developing MEMS based nanoforce sensors with capacitive sensing capabilities. The nanoforce sensors will be further incorporated with in situ SEM and TEM small scale testing systems, for allowing simultaneous visualization of the deformation process during mechanical tests
The project aims to study corrosion, a detrimental process with an enormous impact on global economy, by combining denstiy-functional theory calculations with thermodynamic concepts.
Hydrogen embrittlement affects high-strength ferrite/martensite dual-phase (DP) steels. The associated micromechanisms which lead to failure have not been fully clarified yet. Here we present a quantitative micromechanical analysis of the microstructural damage phenomena in a model DP steel in the presence of hydrogen.
Thermo-chemo-mechanical interactions due to thermally activated and/or mechanically induced processes govern the constitutive behaviour of metallic alloys during production and in service. Understanding these mechanisms and their influence on the material behaviour is of very high relevance for designing new alloys and corresponding…
Nickel-based alloys are a particularly interesting class of materials due to their specific properties such as high-temperature strength, low-temperature ductility and toughness, oxidation resistance, hot-corrosion resistance, and weldability, becoming potential candidates for high-performance components that require corrosion resistance and good…