Results 1 to 10 of about 2,056 (126)

On the interplay between microstructure, residual stress and fracture toughness of (Hf-Nb-Ta-Zr)C multi-metal carbide hard coatings [PDF]

Materials & Design, 2022
The development of sputtered coatings with improved hardness-toughness property combination is widely sought after. Multi-element ceramic carbide (Hf-Nb-Ta-Zr)C coatings with excess carbon, synthesized by DC co-sputtering is presented in this study as a ...
Hariprasad Gopalan, Amalraj Marshal, Marcus Hans, Daniel Primetzhofer, Niels Cautaerts, Benjamin Breitbach, Bernhard Völker, Christoph Kirchlechner, Jochen M. Schneider, Gerhard Dehm   +9 more
doaj   +13 more sources

Determinação das características estruturais e mecânicas da liga de alta entropia Hf-Nb-Ta-Zr [PDF]

VETOR - Revista de Ciências Exatas e Engenharias, 2021
Neste artigo, os comportamentos estrutural e mecânico da liga equiatômica de alta entropia Hf-Nb-Ta-Zr foram estudados mediante simulações computacionais de dinâmica molecular. As simulações foram realizadas no código livre LAMMPS, em um sistema composto de 154.000 átomos que interagiram sob o potencial Embedded Atom Method (EAM).
Jhonatan Silva Andrade, Ivan Napoleão Bastos, Luis César Rodríguez Aliaga   +2 more
core   +8 more sources

Assessment of the Influence of Chemical Composition, Atomic Distribution, and Grain Boundaries on Heat Transfer in Refractory High-Entropy Alloys Hf–Nb–Ta–Zr Based on Atomistic Simulation

Crystals
This work investigates the influence of chemical composition, grain boundary (GB) type, and atomic distribution on the thermal conductivity of Hf–Nb–Ta–Zr refractory high-entropy alloys (RHEAs) via atomistic simulations.
Rita I. Babicheva, Arseny M. Kazakov, Elena A. Korznikova   +2 more
doaj   +2 more sources

Theoretical study on cracking behavior in two-phase alloys Cr–Cr2X (X=Hf, Nb, Ta, Zr)

Intermetallics, 2001
To examine the importance of thermal expansion mismatch on cracking in two-phase Cr–Cr2X (X=Hf, Nb, Ta, Zr) alloys, we have calculated the coefficients of thermal expansion (CTE) of Cr and Laves-phase Cr2X alloys by local-density-functional approach. A Debye model is used to approximate the phonon contribution through the elastic acoustic response. The
Suklyun Hong, C.L. Fu
openaire   +3 more sources

Elastic Constants and Coefficients of Thermal Expansion of Laves Phase Cr₂X (X=Hf, Nb, Ta, Zr) Alloys

MRS Proceedings, 1998
ABSTRACTTo examine the effect of thermal expansion mismatch on cracking in two-phase Cr-Cr2X (X=Hf, Nb, Ta, Zr) alloys, we calculate the elastic constants and associated elastic anharmonicity by the local-density-functional approach from which the coefficients of thermal expansion (CTEs) of Cr and Cr2X are determined. The calculation shows that the CTE
Suklyun Hong, C. L. Fu
openaire   +3 more sources

Wetting and interfacial behavior of Fe, Co, Ni on (Ti, Zr, Hf, Nb, Ta)C high entropy ceramics

Open Ceramics, 2023
The wetting of (Ti, Zr, Hf, Nb, Ta)C) high entropy carbide ceramics by molten metals was studied using a sessile drop method in a vacuum environment. Fe, Co, and Ni demonstrate good wetting with the (Ti, Zr, Hf, Nb, Ta)C substrate forming a final contact
D. Vedel, M. Storozhenko, P. Mazur, V. Konoval, M. Skoryk, O. Grigoriev, M. Heaton, A. Zavdoveev   +7 more
doaj   +1 more source

Comportamento mecânico da liga de alta entropia Hf-Nb-Ta-Zr por dinâmica molecular

Congreso Iberoamericano de Ingeniería Mecánica-CIBIM 2022, 2022
High-entropy alloys have already been shown to possess exceptional properties, surpassing those of conventional alloys. However, due to many possible combinations, only short compositions have been made, and even for these, there is a considerable gap in the literature about their mechanical properties.
Andrade, Jhonatan S., Barboza, Alexandre M., Habib, Anderson Z., Fernandes de Faria, Daiara, Bastos, Ivan N., Aliaga, Luis César R.   +5 more
openaire   +2 more sources

Mechanism and kinetics of high-temperature oxidation of medium- and high-entropy carbides in air

Materials & Design, 2023
Medium- and high-entropy carbides (MECs and HECs) have a wide range of advanced applications and, in many cases, outperform monocarbides. However, the behavior, oxidation mechanisms, and factors defining oxidation resistance of some popular HECs at high ...
Sergey Yudin, Alexey Sedegov, Dmitry Moskovskikh, Sergey Volodko, Kirill Kuskov, Veronika Suvorova, Svetlana Danilova-Tretiak, Stepan Vorotilo, Andrey Nepapushev, Alexander Khort   +9 more
doaj   +1 more source

How to avoid FIB-milling artefacts in micro fracture? A new geometry for interface fracture [PDF]

, 2023
Focused ion beam (FIB) based small-scale fracture studies have been well established in recent years despite the ongoing discussion of possible artefacts caused by FIB milling. Stable crack growth geometries—where the FIB-prepared notch stably propagates
Brinckmann, Steffen, Kirchlechner, Christoph, Lee, Subin, Okotete, Eloho   +3 more
core   +2 more sources

Effects of Transition Elements on the Structural, Elastic Properties and Relative Phase Stability of L1₂ γ′-Co₃Nb from First-Principles Calculations

Metals, 2021
In order to explore novel light-weight Co-Nb-based superalloys with excellent performance, we studied the effects of alloying elements including Sc, Ti, V, Cr, Mn, Fe, Ni, Y, Zr, Mo, Tc, Ru, Rh, Pd, Hf, Ta, W, Re, Os, Ir and Pt on the structural ...
Cuiping Wang, Chi Zhang, Yichun Wang, Jiajia Han, Weiwei Xu, Xingjun Liu   +5 more
doaj   +1 more source