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Paraskevas Kontis
Researcher at Max Planck Society
Publications - 63
Citations - 3102
Paraskevas Kontis is an academic researcher from Max Planck Society. The author has contributed to research in topics: Superalloy & Grain boundary. The author has an hindex of 22, co-authored 60 publications receiving 1780 citations. Previous affiliations of Paraskevas Kontis include University of Oxford & Norwegian University of Science and Technology.
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Journal ArticleDOI
Enhanced strength and ductility in a high-entropy alloy via ordered oxygen complexes
Zhifeng Lei,Xiongjun Liu,Yuan Wu,Hui Wang,Suihe Jiang,S. D. Wang,Xidong Hui,Yidong Wu,Baptiste Gault,Paraskevas Kontis,Dierk Raabe,Lin Gu,Qinghua Zhang,Houwen Chen,Hongtao Wang,Jiabin Liu,Ke An,Qiaoshi Zeng,T.G. Nieh,Zhaoping Lu +19 more
TL;DR: It is shown that oxygen can take the form of ordered oxygen complexes, a state in between oxide particles and frequently occurring random interstitials, which lead to unprecedented enhancement in both strength and ductility in compositionally complex solid solutions, the so-called high-entropy alloys (HEAs).
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Hot cracking mechanism affecting a non-weldable Ni-based superalloy produced by selective electron Beam Melting
Edouard Chauvet,Paraskevas Kontis,Eric Aimé Jägle,Baptiste Gault,Dierk Raabe,Catherine Tassin,Jean-Jacques Blandin,Rémy Dendievel,Benjamin Vayre,Stéphane Abed,Guilhem Martin +10 more
TL;DR: In this article, a non-weldable Ni-based superalloy was fabricated by powder bed-based selective electron beam melting (S-EBM) and cracks were consistently found to propagate intergranular and the effect of crystallographic misorientation on the cracking behavior was investigated.
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On the mechanisms of superplasticity in Ti–6Al–4V
TL;DR: In this article, surface observations were used to elucidate the deformation mechanisms responsible for the superplastic effect in Ti-6Al-4V. The authors used a scanning electron microscope to perform high-temperature in-situ tests for tensile and shear deformation modes.
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Atomic-scale grain boundary engineering to overcome hot-cracking in additively-manufactured superalloys
Paraskevas Kontis,Edouard Chauvet,Zirong Peng,Junyang He,Alisson Kwiatkowski da Silva,Dierk Raabe,Catherine Tassin,Jean-Jacques Blandin,Stéphane Abed,Rémy Dendievel,Baptiste Gault,Baptiste Gault,Guilhem Martin +12 more
TL;DR: In this article, a near-atomic-scale approach was used to investigate the details of the compositional decoration of grain boundaries in the coarse-grained, columnar microstructure in parts built from a non-weldable nickel-based superalloy by selective electron-beam melting.
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The effect of chromium and cobalt segregation at dislocations on nickel-based superalloys
Paraskevas Kontis,Zhuangming Li,David M. Collins,Jonathan Cormier,Dierk Raabe,Baptiste Gault +5 more
TL;DR: In this paper, the segregation of solutes at dislocations in a polycrystalline and a single crystal nickel-based superalloy is studied, showing that pipe diffusion initiates the undesirable dissolution of γ' precipitates.