Chung, H.; Kim, D. W.; Cho, W. J.; Han, H. N.; Ikeda, Y.; Ishibashi, S.; Körmann, F.; Sohn, S. S.: Effect of solid-solution strengthening on deformation mechanisms and strain hardening in medium-entropy V1-xCrxCoNi alloys. Journal of Materials Science & Technology 108, pp. 270 - 280 (2022)
Yang, D.-C.; Jo, Y.-H.; Ikeda, Y.; Körmann, F.; Sohn, S. S.: Effects of cryogenic temperature on tensile and impact properties in a medium-entropy VCoNi alloy. Journal of Materials Science & Technology 90, pp. 159 - 167 (2021)
Vakili, S. M.; Zarei-Hanzaki, A.; Anoushe, A.S.; Abedi, H. R.; Mohammad-Ebrahimi, M. H.; Jaskari, M.; Sohn, S. S.; Ponge, D.; Karjalainen, L. P.: Reversible dislocation movement, martensitic transformation and nano-twinning during elastic cyclic loading of a metastable high entropy alloy. Acta Materialia 185, pp. 474 - 492 (2020)
Jo, M. C.; Choi, J. H.; Lee, H.; Zargaran, A.; Ryu, J.; Sohn, S. S.; Kim, N. J.; Lee, S.: Effects of solute segregation on tensile properties and serration behavior in ultra-high-strength high-Mn TRIP steels. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing 740-741, pp. 16 - 27 (2019)
Kim, D. W.; Sohn, S. S.; Kim, W.-K.; Kim, K.-S.; Lee, S.: Study of Bauschinger effect of acicular ferrite and polygonal ferrite through ex-situ interrupted bending tests in API X80 linepipe steels. Scientific Reports 8 (1), 15598 (2018)
Jo, M. C.; Lee, H.; Zargaran, A.; Ryu, J.; Sohn, S. S.; Kim, N. J.; Lee, S.: Exceptional combination of ultra-high strength and excellent ductility by inevitably generated Mn-segregation in austenitic steel. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing 737, pp. 69 - 76 (2018)
Lee, D. H.; Sohn, S. S.; Song, H.; Ro, Y.; Lee, C. S.; Lee, S.; Hwang, B.: Effects of Start and Finish Cooling Temperatures on the Yield Strength and Uniform Elongation of Strain-Based API X100 Pipeline Steels. Metallurgical and Materials Transactions A 49 (10), pp. 4536 - 4543 (2018)
Sohn, S. S.; Han, S. Y.; Shin, S. Y.; Bae, J.; Lee, S.: Effects of microstructure and pre-strain on Bauschinger effect in API X70 and X80 linepipe steels. Metals and Materials International 19 (3), pp. 423 - 431 (2013)
Sohn, S. S.; Han, S. Y.; Shin, S. Y.; Bae, J.; Lee, S.: Analysis and estimation of the yield strength of API X70 and X80 linepipe steels by double-cycle simulation tests. Metals and Materials International 19 (3), pp. 377 - 388 (2013)
Sohn, S. S.; Jo, Y. H.; Choi , W.-M.; Kim , D. G.; Kim , H. S.; Lee , B. J.; Lee , S.: Transformation-induced plasticity in HEA: FCC to BCC transformation. Thermec 2018, Paris, France (2018)
Enabling a ‘hydrogen economy’ requires developing fuel cells satisfying economic constraints, reasonable operating costs and long-term stability. The fuel cell is an electrochemical device that converts chemical energy into electricity by recombining water from H2 and O2, allowing to generate environmentally-friendly power for e.g. cars or houses…
In this project we study - together with the department of Prof. Neugebauer and Dr. Sandlöbes at RWTH Aachen - the underlying mechanisms that are responsible for the improved room-temperature ductility in Mg–Y alloys compared to pure Mg.
The wide tunability of the fundamental electronic bandgap by size control is a key attribute of semiconductor nanocrystals, enabling applications spanning from biomedical imaging to optoelectronic devices. At finite temperature, exciton-phonon interactions are shown to exhibit a strong impact on this fundamental property.
In this project, we work on a generic solution to design advanced high-entropy alloys (HEAs) with enhanced magnetic properties. By overturning the concept of stabilizing solid solutions in HEAs, we propose to render the massive solid solutions metastable and trigger spinodal decomposition. The motivation for starting from the HEA for this approach…
Efficient harvesting of sunlight and (photo-)electrochemical conversion into solar fuels is an emerging energy technology with enormous promise. Such emerging technologies depend critically on materials systems, in which the integration of dissimilar components and the internal interfaces that arise between them determine the functionality.
We have studied a nanocrystalline AlCrCuFeNiZn high-entropy alloy synthesized by ball milling followed by hot compaction at 600°C for 15 min at 650 MPa. X-ray diffraction reveals that the mechanically alloyed powder consists of a solid-solution body-centered cubic (bcc) matrix containing 12 vol.% face-centered cubic (fcc) phase. After hot compaction, it consists of 60 vol.% bcc and 40 vol.% fcc. Composition analysis by atom probe tomography shows that the material is not a homogeneous fcc–bcc solid solution