Results 51 to 60 of about 12,033 (260)

Coherent precipitate formation in Tl implanted Si [PDF]

Nuclear Instruments and Methods in Physics Research, 1983
Abstract Ion scattering, ion channeling, and cross-section electron microscopy were used to investigate Si single crystals implanted with 205Tl+ (0.29−1×1016 Tl/cm2, 90 keV) and annealed with pulses (1.6 J/cm2, 15 ns) from a ruby laser. Coherent precipitates of Tl were found to form as a result of laser processing.
Appleton, B. R., Narayan, J., White, C. W., Williams, J. S., Short, K. T.   +4 more
openaire   +1 more source

Multimodal Data‐Driven Microstructure Characterization

Advanced Engineering Materials, EarlyView.
A self‐consistent autonomous workflow for EBSP‐based microstructure segmentation by integrating PCA, GMM clustering, and cNMF with information‐theoretic parameter selection, requiring no user input. An optimal ROI size related to characteristic grain size is identified.
Qi Zhang, Santiago Benito, Özge Özgün, Sebastian Weber, Markus Stricker   +4 more
wiley   +1 more source

Hydrogen‐Assisted Fracture of Iron‐Based Fe–Ni–Al Alloys

Advanced Engineering Materials, EarlyView.
Principal relations and fracture mechanisms of single‐phase and precipitate‐strengthened Fe–Ni–Al alloys subjected to prior electrochemical hydrogen charging are identified. The mechanisms of hydrogen effect on strength and microhardness are discussed, including hydrogen‐induced increase in microhardness and the role of hydrogen in fracture behavior ...
Nataliya Yadzhak, Olha Zvirko, Rostyslav Leshchak, Hryhoriy Nykyforchyn   +3 more
wiley   +1 more source

Observation of coherent oxide precipitates in polycrystalline MgB2 [PDF]

Applied Physics Letters, 2002
Here we describe the results of an atomic resolution study of oxygen incorporation into bulk MgB2. We find that ∼20–100 nm sized precipitates are formed by ordered substitution of oxygen atoms onto boron lattice sites, while the basic bulk MgB2 crystal structure and orientation is preserved.
Klie, R. F., Idrobo, J. C., Browning, N. D., Serquis, A. C., Zhu, Y. T., Liao, X. Z., Mueller, F. M.   +6 more
openaire   +2 more sources

Creep‐Induced Microstructural Evolution in an A2‐B2 Superalloy

Advanced Engineering Materials, EarlyView.
A 27.3Ta‐27.3Mo‐27.3Ti‐8Cr‐10Al (at.%) refractory high‐entropy alloy with precipitation‐strengthened A2‐B2 microstructure was studied by creep tests at 1030°C, which demonstrate a transition in deformation mechanisms in the range of 100–150 MPa applied stress. This is associated with changes in dislocation–precipitate interactions. Relevant deformation
Liu Yang, Aparajita Pramanik, Sandipan Sen, Shubhashis Dixit, Marcel Muench, R. J. Vikram, Daniel Schliephake, Yolita M. Eggeler, Ankur Chauhan, Martin Heilmaier, Alexander Kauffmann   +10 more
wiley   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

A detailed exploration of microstructure evolution in a novel Ti–Mo martensitic steel through in-situ observation: The effect of heating rate

Journal of Materials Research and Technology
Rapid heating is a promising technique for achieving excellent mechanical properties. This study innovatively applies rapid heating to a novel Ti–Mo martensite steel through in-situ observation experiments.
Qing Yuan, Jiaxuan Mo, Jie Ren, Wen Liang, Guang Xu   +4 more
doaj   +1 more source

Strain-relief by single dislocation loops in calcite crystals grown on self-assembled monolayers

Nature Communications, 2016
Epitaxial crystal growth attracts significant interest. Here, the authors use Bragg Coherent Diffraction Imaging to demonstrate calcite crystal precipitation on self-assembled monolayers exhibiting single dislocation loops with different geometries to ...
Johannes Ihli, Jesse N. Clark, Alexander S. Côté, Yi-Yeoun Kim, Anna S. Schenk, Alexander N. Kulak, Timothy P. Comyn, Oliver Chammas, Ross J. Harder, Dorothy M. Duffy, Ian K. Robinson, Fiona C. Meldrum   +11 more
doaj   +1 more source

Experimental Characterization and Constitutive Modeling of the Effect of Prior Inelastic Strain on the Viscoplastic Behavior of AD730 at 700 °C

Advanced Engineering Materials, EarlyView.
This study shows that superalloys used in aircraft engine disks become much more prone to deformation at high temperatures if they have been strained during manufacturing. This effect increases with the level of prior strain but eventually reaches a limit.
Fabio Machado Alves da Fonseca, Patrick Villechaise, Malik Durand, Arnaud Longuet, Florent Coudon, Loïc Signor, Julien De Jaeger, Dominique Eyidi, Nathalie Bozzolo, Jonathan Cormier   +9 more
wiley   +1 more source

Winter precipitation over the Iberian peninsula and its relationship to circulation indices [PDF]

Hydrology and Earth System Sciences, 2001
Winter precipitation variability over the Iberian peninsula was investigated by obtaining the spatial and temporal patterns. Empirical Orthogonal Functions were used to describe the variance distribution and to compress the precipitation data into a few ...
C. Rodríguez-Puebla, C. Rodríguez-Puebla, A. H. Encinas, J. Sáenz   +3 more
doaj