Springer, H.; Kostka, A.; dos Santos, J. F.; Raabe, D.: Influence of intermetallic phases and Kirkendall-porosity on the mechanical properties of joints between steel and aluminium alloys. Materials Science Engineering A 528, pp. 4630 - 4642 (2011)
Springer, H.; Kostka, A.; Payton, E.J.; Raabe, D.; Kaysser-Pyzalla, A. R.; Eggeler, G.: On the formation and growth of intermetallic phases during interdiffusion between low-carbon steel and aluminum alloys. Acta Materialia 59 (4), pp. 1586 - 1600 (2011)
Rao, J.; Payton, E. J.; Somsen, C.; Neuking, K.; Eggeler, G.; Kostka, A.; dos Santos, J. F.: Where Does the Lithium Go? – A Study of the Precipitates in the Stir Zone of a Friction Stir Weld in a Li-containing 2xxx series Al Alloy. Advanced Engineering Materials 12 (4), pp. 298 - 303 (2010)
Barbatti, C.; Garcia, J.; Pinto, H.; Kostka, A.; Di Prinzio, A.; Staia, M.; Pitonak, R.; Pyzalla, A. R.: Influence of micro-blasting on the microstructure and residual stresses of CVD κ-Al2O3 coatings. Surface and Coatings Technology 203 (24), pp. 3708 - 3717 (2009)
Coelho, R. S.; Kostka, A.; Pinto, H.; Rothkirch, A.; Pyzalla, A. R.; Dos Santos, J.: Microstructure and Residual Stress Formation in an AA6040 to AZ31B Friction Stir Weld. Advances in X-Ray Analyses 52, pp. 360 - 367 (2009)
Kostka, A.; Coelho, R. S.; dos Santos, J.; Pyzalla, A. R.: Microstructure of friction stir welding of aluminium alloy to magnesium alloy. Scripta Materialia 60, pp. 953 - 956 (2009)
Coelho, R. S.; Kostka, A.; dos Santos, J.; Pyzalla, A. R.: ESBD technique visualization of material flow in aluminium to steel friction-stir dissimilar welding. Advanced Engineering Materials 10 (12), pp. 1127 - 1133 (2008)
Barbatti, C.; Garcia, J.; Sket, F.; Kostka, A.; Pyzalla, A. R.: Influence of nitridation on surface microstructure and properties of graded cemented carbides with Co and Ni binders. Surface and Coating Technology 292, pp. 5962 - 5975 (2008)
Coelho, R. S.; Kostka, A.; Pinto, H.; Riekehr, S.; Kocak, M.; Pyzalla, A. R.: Microstructure and Mechanical Properties of Magnesium Alloy AZ31B Laser Beam Welds. Material Science and Engineering A 485, pp. 20 - 30 (2008)
Coelho, R. S.; Kostka, A.; Pinto, H.; Riekehr, S.; Kocak, M.; Pyzalla, A. R.: Microstructure and Residual Stresses in Dissimilar Mg–Al–Zn-alloy Single Overlap Laser Beam Welds. Materials Science Forum 571-572, pp. 361 - 366 (2008)
Coelho, R. S.; Kostka, A.; Sheikhi, S.; dos Santos, J.; Pyzalla, A. R.: Microstructure and Mechanical Properties of an AA6181-T4 Aluminium Alloy to HC340LA High Strength Friction Stir Overlap Weld. Advanced Engineering Materials 10 (10), pp. 961 - 972 (2008)
Kostka, A.; Tak, K.-G.; Eggeler, G.: On the effect of equal-channel angular pressing on creep of tempered martensite ferritic steels. Materials Science and Engineering A 481-482, pp. 723 - 726 (2008)
Dumont, M.; Pyzalla, A. R.; Kostka, A.; Borbély, A.: Characterization of sauropod bone structure. In: Biology of the sauropod dinosaurs: understanding the life of giants, pp. 150 - 169 (Eds. Klein, N.; Remes, K.; Sander, P.M.). Indiana University Press, Bloomington and Indianapolis (2011)
dos Santos, J. F.; Olea, C. A. W.; Coelho, R. S.; Kostka, A.; Paglia, C. S.: Metallurgy and weld performance in friction stir welding. In: Friction stir welding: From basics to applications, pp. 1 - 436 (Eds. Lohwasser, D.; Chen, Z.). Woodhead Publishing Limited incorporating Chandos Publishing, Cambridge, UK (2009)
Hammerschmidt, T.; Koßmann, J.; Zenk, C. H.; Neumeier, S.; Göken, M.; Lopez-Galilea, I.; Mújica Roncery, L.; Huth, S.; Kostka, A.; Theisen, W.et al.; Drautz, R.: The role of local chemical composition for TCP phase precipitation in Ni-base and Co-base superalloys. In: Proceedings of the International Symposium on Superalloys, Vol. 2016, pp. 89 - 96. 13th International Symposium on Superalloys, SUPERALLOYS 2016; Seven Springs Mountain ResortSeven Springs, Seven Springs, PA, USA, September 11, 2016 - September 15, 2016. Minerals, Metals and Materials Society, Pittsburgh, PA, USA (2016)
Springer, H.; Aparicio-Fernández, R.; Duarte, M. J.; Zhang, H.; Baron, C.; Kostka, A.; Raabe, D.: Alloy design and processing routes for novel high modulus steels. In: PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, p. 981 (Eds. Chen, L.-Q.; Militzer, M.; Botton, G.; Howe, J.; Sinclair, C. W. et al.). International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015, Whistler, BC, Canada, June 28, 2015 - July 03, 2015. PTM 2015, Whistler, British Columbia (2015)
Naraparaju, R.; Christ, H.-J.; Renner, F. U.; Kostka, A.: Dislocation Engineering and its effect on the oxidation behaviour. Materials at High Temperatures 29, pp. 116 - 122 (2012)
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…
This project aims to investigate the influence of grain boundaries on mechanical behavior at ultra-high strain rates and low temperatures. For this micropillar compressions on copper bi-crystals containing different grain boundaries will be performed.
Microbiologically influenced corrosion (MIC) of iron by marine sulfate reducing bacteria (SRB) is studied electrochemically and surfaces of corroded samples have been investigated in a long-term project.
In this project we investigate the hydrogen distribution and desorption behavior in an electrochemically hydrogen-charged binary Ni-Nb model alloy. The aim is to study the role of the delta phase in hydrogen embrittlement of the Ni-base alloy 718.
We plan to investigate the rate-dependent tensile properties of 2D materials such as metal thin films and PbMoO4 (PMO) films by using a combination of a novel plan-view FIB based sample lift out method and a MEMS based in situ tensile testing platform inside a TEM.
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.
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…
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.