Zobrazeno 1 - 10 of 234 pro vyhledávání: '"Kostka, Aleksander"'
1
Report
Deformation-induced homogenization of the multi-phase senary high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion
Autor: Duan, Chuyi, Kostka, Aleksander, Li, Xiaohu, Peng, Zirong, Kutlesa, Peter, Pippan, Reinhard, Werner, Ewald
Publikováno v: Mater. Sci. Eng. A 871 (2023) 144923
Dendritic microstructures are frequently observed in as-solidified refractory high-entropy alloys (RHEAs), and their homogenization typically requires a long-term heat treatment at extremely high temperatures. High-pressure torsion (HPT) has been sho
Externí odkaz: http://arxiv.org/abs/2306.05711
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2
Report
Modified Z-Phase Formation in a 12% Cr Tempered Martensite Ferritic Steel during Long-Term Creep
Autor: Westraadt, Johan Ewald, Goosen, William Edward, Kostka, Aleksander, Wang, Hongcai, Eggeler, Gunther
The formation of modified Z-phase in a 12Cr1MoV (German grade: X20) tempered martensite ferritic (TMF) steel subjected to interrupted long-term creep-testing at 550$^{\circ}$C and 120 MPa was investigated. Quantitative volumetric measurements collect
Externí odkaz: http://arxiv.org/abs/2206.15070
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7
Report
On the coarsening mechanism and deformation of borides under annealing and creep in a polycrystalline superalloy
Autor: Lilensten, Lola, Kostka, Aleksander, Lartigue-Korinek, Sylvie, Antonov, Stoichko, Tin, Sammy, Gault, Baptiste, Kontis, Paraskevas
We have investigated the coarsening mechanism of intergranular Cr-rich M2B borides after creep and annealing at 850C for approximately 3000 hours in a polycrystalline nickel-based superalloy. Borides were found to be coarser after creep, with measure
Externí odkaz: http://arxiv.org/abs/2007.02581
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8
Report
Spinodal decomposition versus classical gamma-prime nucleation in a nickel-base superalloy powder: An in-situ neutron diffraction and atomic-scale analysis
Autor: Collins, David M, D'Souza, Neil, Panwisawas, Chinnapat, Papadaki, Chrysanthi, West, Geoff D, Kostka, Aleksander, Kontis, Paraskevas
Publikováno v: Acta Materialia 200 (2020) 959-970
Contemporary powder-based polycrystalline nickel-base superalloys inherit microstructures and properties that are heavily determined by the thermo-mechanical treatments during processing. Here, the influence of a thermal exposure alone to an alloy po
Externí odkaz: http://arxiv.org/abs/2004.01146
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10
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