Results 41 to 50 of about 18,009 (224)

Low‐Angle Grain Boundaries and Re‐Segregation in Single‐Crystalline Ni‐Base Superalloys

Advanced Engineering Materials, EarlyView.
This work demonstrates that Re‐segregation at low‐angle grain boundaries (LAGBs) in Ni‐base superalloys is influenced by misorientation angle. Advanced microscopy and atom probe tomography reveal that higher misorientation angles increases Re‐segregation.
Alireza B. Parsa, Aparna Saksena, Alesander Kostka, Pascal Thome, Felicitas Scholz, Alexandre Mussi, Christoph Somsen, Baptiste Gault, Jan Frenzel, Gunther Eggeler   +9 more
wiley   +1 more source

First-principles study of epitaxial strain in perovskites

, 2005
Using an extension of a first-principles method developed by King-Smith and Vanderbilt [Phys. Rev. B {\bf 49}, 5828 (1994)], we investigate the effects of in-plane epitaxial strain on the ground-state structure and polarization of eight perovskite oxides:
D. Vanderbilt, David Vanderbilt, J. B. Neaton, J. S. Speck, Karin M. Rabe, M. E. Lines, Oswaldo Diéguez   +6 more
core   +1 more source

Rafting of Ni‐Based Superalloys Under Multiaxial Load as Understood by Phase‐Field Simulations and Critical Experiments

Advanced Engineering Materials, EarlyView.
Phase‐field simulations coupled with dislocation‐density‐based crystal plasticity modeling reproduce γ′ rafting behavior in single‐crystal Ni‐based superalloys under varied loading conditions. The model captures both macroscopic creep and microscopic morphology evolution, with results matching high‐temperature creep experiments.
Micheal Younan, David Bürger, Gunther Eggeler, Oleg Shchyglo, Ingo Steinbach, Muhammad Adil Ali   +5 more
wiley   +1 more source

Scaling of Heteroepitaxial Island Sizes

, 1994
Monte Carlo simulations of an atomistic solid-on-solid model are used to study the effect of lattice misfit on the distribution of two-dimensional islands sizes as a function of coverage $\Theta$ in the submonolayer aggregation regime of epitaxial growth.
A. Zangwill, Bartelt, Blackman, Blackman, Blandin, C. Ratsch, Clarke, Family, Grandjean, Massies, P. Šmilauer, Ratsch, Ratsch, Ratsch, Shitara, Shitara, Snyman, Sorensen, Stroscio, Stroscio, Tang, Tersoff, Van der Merwe   +22 more
core   +2 more sources

Creep Properties and Deformation Mechanism of Additively Manufactured NiAl‐CrMo Composites

Advanced Engineering Materials, EarlyView.
Additively manufactured NiAl‐CrMo composites contain numerous interfaces and cell boundaries that control their creep response. At 700°C under high applied stress, creep is dominated by dislocation‐controlled power‐law mechanisms. At 800°C–900°C and lower stresses, creep is primarily diffusion‐controlled along cell boundaries.
Jan Vollhüter, Andreas Bezold, Johan Westraadt, Katharina Fiegl, Subham Chattoraj, Benjamin Wahlmann, Carolin Körner, Michael Mills, Mathias Göken, Steffen Neumeier   +9 more
wiley   +1 more source

Control of Polarization and Polar Helicity in BiFeO3 by Epitaxial Strain and Interfacial Chemistry

Advanced Functional Materials, EarlyView.
In BiFeO3 thin films, the interplay of interfacial chemistry, electrostatics, and epitaxial strain is engineered to stabilize homohelicity in polarization textures at the domain scale. The synergistic use of a Bi2O2‐terminated Aurivillius buffer layer and a highly anisotropic compressive epitaxial strain offers new routes to control the polar‐texture ...
Elzbieta Gradauskaite, Lilia Huynh, Natascha Gray, Quintin N. Meier, Marta D. Rossell, Morgan Trassin   +5 more
wiley   +1 more source

Effects of lattice misfit of γ/γ′ phases on hydrogen embrittlement behavior in Ni-based single crystal superalloy

Journal of Materials Research and Technology
The effect of γ/γ′ phase lattice misfit on hydrogen embrittlement (HE) behavior was fundamentally investigated by utilizing a Ni-based single crystal CMSX-4 superalloy with a simple microstructure that can exclude the H-trapping effects of grain boundary,
Jisung Yoo, Hyeonseok Kwon, Seungwoo Song, Jeonghyeon Do, Dae Won Yun, Hyoung Seop Kim, Seung-gun Lee, In Soo Kim, Baig-Gyu Choi   +8 more
doaj   +1 more source

Cooperative dissociations of misfit dislocations at bimetal interfaces

APL Materials, 2016
Using atomistic simulations, several semi-coherent cube-on-cube bimetal interfaces are comparatively investigated to unravel the combined effect of the character of misfit dislocations, the stacking fault energy difference between bimetal pairs, and ...
K. Liu, R. F. Zhang, I. J. Beyerlein, X. Y. Chen, H. Yang, T. C. Germann   +5 more
doaj   +1 more source

Alloying Effects on the Stability of D0₂₂ γ”-Ni₃M (M: Nb, Ta, V) Precipitates at Elevated Temperatures in Alloy 718 Type Ni-Based Alloys

Metals, 2022
The effects of alloying elements, M (M = Nb, Ta, and V), on the stability of D022 γ”-Ni3M precipitates at elevated temperatures were investigated in Ni-22Cr-based ternary and quaternary alloys using heat-treated diffusion-multiple and bulk samples with ...
Kako Tokutomi, Kyosuke Sagitani, Satoru Kobayashi   +2 more
doaj   +1 more source

Frustration - how it can be measured

, 1995
A misfit parameter is used to characterize the degree of frustration of ordered and disordered systems. It measures the increase of the ground-state energy due to frustration in comparison with that of a relevant reference state.
A. Chakrabarti, B. A. Berg, B. Derrida, B. Derrida, D. C. Mattis, D. L. Stein, D. Sherrington, E. E. Vogel, F. Barahona, G. H. Wannier, G. Parisi, G. Toulouse, I. Morgenstern, I. Morgenstern, J. A. Mydosh, J. Canisius, J. R. Banavar, J. Richter, J. Richter, J. Villain, K. Binder, K. Fischer, M. Grötschel, M. J. de Olivera, M. Mézard, P. Sibani, P. W. Anderson, S. Alexander, S. Kirkpatrick, S. Kirkpatrick, S. Kobe, S. Kobe, S. Kobe, S. Kobe, T. Celik, T. Klotz, T. Klotz, U. Gropengiesser, U. Gropengiesser, W. Zieliński   +39 more
core   +2 more sources