Article
Chemistry, Physical
Chiwon Kim, Jiun Park, Hyun-Uk Hong, Jiho Gu, Youngseok Song
Summary: The effects of stabilization conditions on microstructure evolution and mechanical properties of Ni-Fe-based superalloy Inconel 706 were investigated. The results showed that increasing the stabilization temperature led to an increase in precipitates and improved yield strength. Furthermore, the high temperature stabilization resulted in higher creep strain in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jingyuan Guo, Yefan Li, Chong Li, Liming Yu, Huijun Li, Zumin Wang, Yongchang Liu
Summary: The isothermal oxidation behavior of micro-regions in multiphase Ni3Al-based superalloys with high Fe and Cr contents at 600 degrees C in air showed the formation of outer mixed oxide layer and inner single Al2O3 layer, with particular formation of Cr2O3 and dense continuous Al2O3 layer in different regions.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Characterization & Testing
Chuleeporn Paa-rai, Gobboon Lothongkum, Panyawat Wangyao
Summary: The study investigated the effects of different cooling media on the restored microstructures of IN-738 turbine blade samples, revealing that cooling in air resulted in spherical gamma prime particles while cooling in a furnace led to irregular shapes. Additionally, the solutionizing temperature also played a role in generating bimodal or unimodal gamma prime precipitation shapes during aging processes.
Article
Crystallography
Zhengxing Feng, Zhixun Wen, Guangxian Lu, Yanchao Zhao
Summary: The reprecipitation and evolution of gamma' precipitates during cooling in nickel-based single crystal superalloys were investigated through experiments and phase field simulations. The study examined the influence of cooling methods on the morphology and distribution of gamma' precipitates. The results showed that cooling rate affected the shape and distribution of the precipitates, with different cooling rates leading to different characteristics. This research is significant for the study of heat treatment in nickel-based superalloys.
Article
Materials Science, Multidisciplinary
Damian Migas, Bartosz Chmiela, Hanna Myalska-Glowacka, Grzegorz Moskal, Krzysztof Matus, Radoslaw Swadz
Summary: The study investigates the individual role of yttrium and Y-related phases during oxidation of Co-based alloys. It reveals that the addition of yttrium improves the oxidation resistance of the alloys, especially under cyclic conditions. The yttrium-containing oxide areas within the oxide scale correspond to the original yttrium-rich particles in the alloy.
Article
Materials Science, Multidisciplinary
Wenchao Yang, Huajing Zong, Chen Yang, Pengfei Qu, Haijun Su, Yin Dong, Jun Zhang, Lin Liu
Summary: The effect of Fe addition on y' precipitates in Ni-20Co-xFe-12Cr-7.5Al-7.5Ti-1.5 W single crystal superalloys was systematically studied. The results showed that higher Fe content resulted in a lower volume fraction and changed morphology of y' precipitates. Additionally, the alloy with Fe addition exhibited a higher coarsening rate of y' precipitates during thermal exposure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Xiaoli Zhuang, Stoichko Antonov, Longfei Li, Qiang Feng
Summary: This study investigated the gamma' coarsening behavior of multi-component CoNi-based superalloys with high Cr content during long-term aging at 850 degrees C. It analyzed the effects of W, Mo or Ti additions on the gamma/gamma' microstructure, lattice misfit, and elemental partitioning behavior, with Ti having the most significant impact. The study also found that Cr is the rate-limiting element for gamma' coarsening.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Pei Liu, Haiyou Huang, Cheng Wen, Turab Lookman, Yanjing Su
Summary: In this study, a small data-driven machine learning algorithm based on probability density functions is employed to optimize the gamma' volume fraction, size, and morphology in CoNiAlCr-based superalloys. By utilizing this algorithm, sixteen alloys with high creep strength are synthesized from a large number of candidates, with three of them possessing desired gamma' microstructural properties.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Prafull Pandey, Amit Sawant, Nithin Baler, Surendra K. Makineni, Kamanio Chattopadhyay
Summary: The addition of Ru enhances the microstructural stability of γ/γ' phase in Co-30Ni-10Al-5Mo-2Nb superalloy, reduces the interfacial energy of γ/γ', and increases the degree of anomalous strengthening.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Nicholas J. Krutz, Yan Gao, Yang Ren, Ian Spinelli, Michael J. Mills
Summary: The study investigated the lattice parameter evolution and misfit phenomenon of two commercial powder metallurgy nickel-base superalloys during cooling, using in-situ synchrotron X-ray diffraction and scanning electron microscopy. The results indicated a correlation between the conditions that lead to cuboidal gamma ' precipitate shapes and the highest degrees of misfit.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Wenjie Lu, Xian Luo, Bin Huang, Pengtao Li, Yanqing Yang
Summary: The outstanding thermal stability of coherent gamma' phases in Ni46Cr23Fe23Al4Ti4 and Ni(46)Cr(23)Co(23)Al(4)Ti(4) medium-entropy alloys at 1073 K was systematically investigated. The coarsening behaviors of coherent gamma' phase in these alloys followed the classical Lifshitz-Slyozov-Wagner (LSW) model. The morphology evolution and coarsening behavior of gamma' phase were affected by the gamma/gamma' lattice misfit, with lower misfit helping to maintain the spherical morphology and reducing the interfacial energy. Decreasing the misfit and interfacial energy can be effective strategies for developing gamma'-strengthened high/medium-entropy alloys for high-temperature applications.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Qinghai Pan, Xinbao Zhao, Yuan Cheng, Quanzhao Yue, Yuefeng Gu, Hongbin Bei, Ze Zhang
Summary: In this study, the microstructure evolution of the fourth-generation nickel-based single crystal superalloys with different Co additions is investigated at three thermal exposure temperatures. The effects of Co content and aging temperatures on the coarsening rate of the gamma ' phase are analyzed based on LSW theory and TIDC theory. The results reveal that the diffusion coefficient of solute is accelerated, but the gamma/gamma ' interfacial energy decreases with the addition of Co, thus changing the coarsening rate. The alleviation of thermodynamic equilibrium solubility difference and element segregation at the gamma/gamma ' interface with Co increase suppresses the TCP phase after long-time thermal exposure, providing guidance for the economical design of nickel-based single crystal superalloys.
Article
Engineering, Mechanical
Satyapriya Gupta, Curt A. Bronkhorst
Summary: A dislocation density based crystal plasticity model is developed to capture the micromechanical behavior of gamma' strengthening nickel-based superalloys. The model incorporates multiple strengthening mechanisms and models the interaction between gamma and gamma' phases. The model also considers back stress induced by dislocation interactions and APB shearing as dominant deformation mechanisms.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Chemistry, Multidisciplinary
Florencia Malamud, Javier Roberto Santisteban, Yan Gao, Takenao Shinohara, Kenichi Oikawa, Anton Tremsin
Summary: This study investigates the lattice misfit in nickel-based superalloys using energy-resolved neutron imaging experiments, and analyzes the position and width of Laue peaks to determine the lattice parameters, strain misfit, and misorientation between phases. The research provides detailed analysis of the lattice misfit at different positions of the specimen and reveals the relative misorientation between different parts of the specimen.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Chemistry, Physical
Xia Yao, Qingqing Ding, Xiao Wei, Jin Wang, Ze Zhang, Hongbin Bei
Summary: This study investigates the influence of Re and Ru additions on the phase morphologies and microstructure in Ni-based superalloys. It is found that Re affects the size and shape of γ' precipitates and significantly reduces the lattice misfit of γ/γ'. On the other hand, Ru has little effect on the morphology of γ' precipitates and the lattice misfit, but alters the partitioning behaviors of other elements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Martina Cazzola, Jacopo Barberi, Sara Ferraris, Andrea Cochis, Grzegorz Cempura, Aleksandra Czyrska-Filemonowicz, Lia Rimondini, Silvia Spriano
Summary: This research aims to develop an antibacterial and osteoconductive Ti6Al4V surface by using chemical etching-oxidation treatment and in situ reduction of silver nanoparticles. The study found that the concentration and addition time of the silver precursor affect the distribution and release of silver in the surface oxide layer. The silver concentration in the samples determines their bactericidal and cytotoxic abilities.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Krystian Lankauf, Karolina Gornicka, Patryk Blaszczak, Jakub Karczewski, Jacek Ryl, Grzegorz Cempura, Marcin Zajac, Maciej Bik, Maciej Sitarz, Piotr Jasinski, Sebastian Molin
Summary: In this study, a series of MnCo2-xFexO(4) powders were synthesized by the sol-gel method to investigate the effect of partial Fe substitution on the physicochemical and electrochemical properties of MnCo2O4 spinel. The synthesized powders were characterized using various techniques. The findings revealed that the electrocatalytic activity towards oxygen evolution reaction (OER) was enhanced when Fe was partially substituted for Co, with the highest activity observed at x = 0.5. This indicates that tuning the eg occupancy at the octahedral sites through Fe substitution can modulate the catalytic activity of OER.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Sylwia Pawlowska, Krystian Lankauf, Patryk Blaszczak, Jakub Karczewski, Karolina Gornicka, Grzegorz Cempura, Piotr Jasinski, Sebastian Molin
Summary: In this study, the mechanical modification of MnCo2O4 (MCO) spinel powders was performed through a low-energy ball milling process for the first time. The research found that the mechanical and chemical modification of the MCO spinel could enhance its electrocatalytic properties. After 30 days of ball-milling, the overpotential of MCO spinel decreased to 352 mV at 10 mA cm-2 when the amount of Nafion was reduced to 10% of its initial value, indicating that the composition of catalyst ink and layer was an important factor influencing the efficiency of the catalyst in the OER.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Enrico Gnecco, Arkadiusz Janas, Benedykt R. Jany, Antony George, Andrey Turchanin, Grzegorz Cempura, Adam Kruk, Manoj Tripathi, Frank Lee, A. B. Dalton, Franciszek Krok
Summary: The interaction between metallic nanoparticles and transition metal chalcogenides (TMDs) can lead to new functionalities in technology fields such as optoelectronics and nanoengineering. In this study, the self-assembly of triangular-shaped crystalline Au nanoislands on mechanically exfoliated or chemically vapor deposited (CVD) MoS2 flakes was investigated. The density and size of the islands were determined by substrate temperature, deposition flux, and subsurface morphology. Raman spectroscopy was used to measure the thickness of the MoS2 layers and evaluate the strain and doping distributions induced by the Au islands. Scanning electron microscopy (SEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) were used to obtain top and cross-sectional images of the Au-MoS2 interface. Sub-nanometer resolution images revealed that the MoS2 flakes followed the corrugation of the SiO2 substrate, with flattening and wrinkling effects induced by the growth of the Au islands on top.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Civil
Lukasz Rakoczy, Malgorzata Grudzien-Rakoczy, Bogdan Rutkowski, Rafal Cygan, Fabian Hanning, Grzegorz Cios, Stefan Habisch, Joel Andersson, Peter Mayr, Anna Zielinska-Lipiec
Summary: This study investigates the influence of microstructural constituents on liquation crack formation in the cast Ni-based superalloy, Rene 108. It is found that the base material has a complex microstructure, including gamma matrix, gamma' precipitates, MC and M23C6 carbides, and M5B3 borides. The constitutional liquation in the alloy leads to a significant reduction in strength and ductility, resulting in low weldability. In the heat-affected zone, mainly gamma' precipitates undergo constitutional liquation, forming a thin non-equilibrium liquid film along high-angle grain boundaries, which initiates and propagates cracks during cooling.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Magdalena Rozmus-Gornikowska, Jan Kusinki, Grzegorz Cempura, Jerzy Morgiel
Summary: The microstructure and composition of the transition zone between the 16Mo3 steel boiler tube and 310 austenitic stainless steel weld overlay produced by the Cold Metal Transfer method were studied. The transition zone was found to have a complex structure related to the changing composition. Two distinct areas were observed in the transition zone, with the area near the fusion boundary exhibiting a two-phase structure. TEM investigation revealed the presence of a martensitic-austenitic structure in this area. The width of the martensite area in the transition zone of weld overlay can be significantly reduced by using a low-energy welding method.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Materials Science, Multidisciplinary
B. Kamecki, J. Karczewski, G. Cempura, P. Jasinski, S. Molin
Summary: This study reported the preparation of (Mn,Co,Fe,Ni,Cr)3O4 high-entropy spinel oxide thin film with a thickness of -500 nm using a facile spray pyrolysis technique. The structural and electrical properties of the film were characterized after heat treatment at temperatures ranging from 400-900°C. The as-deposited film was amorphous and crystallized at 500°C, showing a homogeneous elemental distribution and the desired Fd-3m cubic spinel structure. The electrical conductivity of the film was found to depend on the processing temperature, with the highest conductivity obtained at 700°C.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
D. Koszelow, M. Makowska, A. Drewniak, G. Cempura, P. Jasinski, S. Molin
Summary: In this study, a long-term corrosion evaluation of three ferritic iron-chromium alloys with varying Cr contents was conducted at different temperatures in air. The results showed that all alloys exhibited breakaway corrosion at temperatures above 600°C, but showed minimal oxidation at 600°C even after 6000 hours. The proposed prediction model accurately estimated the lifetimes of two alloys, but showed deviation for the third alloy.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Andrii Fedorchuk, Magdalena Laskowska, Grzegorz Cempura, Adam Kruk, Anna Nowak, Mateusz Dulski, Malgorzata Kac, Oleksandr Pastukh, Piotr M. Zielinski, Jerzy Kubacki, Lukasz Laskowski
Summary: In this study, a novel nanocomposite material was synthesized by functionalizing the SBA-15 silica matrix with anchored iron phosphonate molecules and conducting thermal treatment. The obtained materials are of great interest for their unique structure and potential applications in catalysis, adsorption, and non-linear optics. Various characterization techniques were used to analyze the obtained materials.
Article
Nanoscience & Nanotechnology
Ya. Saliy, L. Nykyruy, G. Cempura, O. Soroka, T. Parashchuk, I. Horichok
Summary: This study demonstrates the presence of periodic nanostructures in Pb1-xSnxTe materials and explains their formation through the generation and recombination of point defects during diffusion processes. These structures can considerably modify the electronic and thermal transport properties of the materials.
PHYSICS AND CHEMISTRY OF SOLID STATE
(2023)
Article
Chemistry, Physical
Tomasz Skrzekut, Lucyna Jaworska, Piotr Noga, Piotr Jelen, Grzegorz Cempura
Summary: This paper presents the optimization of the sintering process of Ti6Al4V powders using SPS and the study of the impact of graphene oxide (GO) on this material. The effect of adding GO to Ti6Al4V was determined and optimal mixing parameters were selected based on the homogeneity of carbon distribution determined by X-ray spectrometry. Tests using SEM, TEM, and Raman spectrometry techniques were performed to identify the phase boundaries between Ti6Al4V and GO. The results showed that the addition of GO strengthens Ti6Al4V and the proposed method is effective in strengthening the Ti6Al4V alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Lukasz Rakoczy, Malgorzata Grudzien-Rakoczy, Rafal Cygan, Tomasz Kargul, Lukasz Maj, Anna Zielinska-Lipiec
Summary: The research investigates the Ni-based superalloy castings produced via directional solidification at various mold preheating temperatures and withdrawal rates. Casting analyses were carried out to study the microstructure, phase composition, and mechanical properties of the castings. The results showed that the withdrawal rate and mold temperature had significant effects on the microstructure and mechanical properties of the castings. The ultimate tensile strength of the castings was in the range of 970 to 1088 MPa.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Crystallography
Marcin Wojtyniak, Christian Rodenbuecher, Benedykt R. Jany, Grzegorz Cempura, Adam Kruk, Franciszek Krok, Krzysztof Szot
Summary: The physical and chemical properties of oxide materials are strongly affected by defect concentration, giving rise to unique electronic, optical, and dielectric properties. SrTiO3 (STO) is a promising material for various applications due to its interesting phenomena, such as a metal-to-insulator transition induced by reduction. Dislocations, which are 1-D defects, play a significant role in its electronic properties. Therefore, we investigate the process of dislocation movement, creation, and annihilation under ion thinning and electron irradiation.
Article
Chemistry, Physical
Klaudia Dziewiatka, Jakub Matusik, Anita Trenczek-Zajac, Grzegorz Cempura
Summary: This study compares the application of different TiO2-loaded kaolin minerals in photocatalyst design. The results show that the photocatalytic performance of calcined nanotubes is superior, with higher specific surface area and adsorption properties, making them suitable for dye degradation reactions.
APPLIED CLAY SCIENCE
(2023)
