Results 61 to 70 of about 12,033 (260)

Coherent Modelling of Backscatter and Propagation of Precipitation [PDF]

, 2002
In order to improve knowledge about scattering processes and their effects on the backscattered signal, accurate modelling of radar backscatter is required. In this paper we present a stochstic, coherent and fully-polarimetric scattering model which simulates the propagation of an electromagnetic wave through a medium containing raindrops of various ...
Börner, Thomas, Bebbington, David, Chandra, Madhukar   +2 more
openaire   +1 more source

Precipitation Simulations of the O‐Phase in Ti2AlNb Alloys Processed by Laser Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Simulated and experimental evolution of the O‐phase volume fraction during postprocessing of a Ti‐21Al‐25Nb (at.%) alloy processed by laser powder bed fusion. With results of sensitivity to input parameters from a thorough and quantified analysis, the interfacial energy matrix/precipitate is the most relevant input parameter for the simulation of the O‐
Silvana Tumminello, Joachim Gussone, Suzana G. Fries, Marcus Rackel, Andreas Stark, Norbert Schell, Jan Haubrich, Guillermo Requena   +7 more
wiley   +1 more source

Precipitation strengthening in an ultralight magnesium alloy

Nature Communications, 2019
Solution treatment and quenching can strengthen magnesium-lithium-aluminium alloys, but this strength decreases with ageing. Here, the authors show this is due to semi-coherent nanoparticle precipitation followed by coarsening, and control the lattice ...
Song Tang, Tongzheng Xin, Wanqiang Xu, David Miskovic, Gang Sha, Zakaria Quadir, Simon Ringer, Keita Nomoto, Nick Birbilis, Michael Ferry   +9 more
doaj   +1 more source

On coherent carbonitride precipitation in commercial microalloyed steels

Philosophical Magazine Letters, 2003
Fine vanadium carbonitride particles nucleated during interphase precipitation have been investigated in the transmission electron microscope under controlled conditions of diffraction contrast. On dark-field micrographs taken with a carbonitride reflection, particle sizes ranged from 5 nm down to below 2 nm in diameter.
E. V. Morales, J. Gallego, H.-J. Kestenbach   +2 more
openaire   +1 more source

Modeling Dislocation Cutting of γ′ Precipitates in Ni‐Base Superalloys: Linking Atomistic and Dislocation Dynamics Simulations

Advanced Engineering Materials, EarlyView.
Dislocation cutting of γ′ precipitates in Ni‐based superalloys is investigated by linking atomistic simulations with discrete dislocation dynamics. The critical cutting stress is shown to be governed by the antiphase boundary energy, while line tension effects promote edge‐preferred cutting.
Frédéric Houllé, Siwen Gao, Marc Fivel, Anxin Ma, Daria Smirnova, Sriram Anand, Arun Prakash, Julien Guénolé, Alexander Hartmaier, Erik Bitzek   +9 more
wiley   +1 more source

Research on strength and toughness matching of 1.3GPa ultralow temperature resistant bulb flat steel

Materials & Design
In this study, an ultralow temperature resistant bulb flat steel with ultra-high strength and good toughness is prepared to meet the application requirements of hull structural steel for polar ships and large ships.
Kun Wang, Jungang Han, Hao Yu
doaj   +1 more source

Coherent Doppler lidar for aerosol-cloud-dynamics interaction studies operating at 532.25 nm with a 3.2 GHz data acquisition [PDF]

EPJ Web of Conferences
A coherent Doppler lidar (CDL) operating at 532.25 nm wavelength with a 3.2 GHz data acquisition is developed. The technical setup is described.
Fritzsch F., Bühl J., Bollig C., Engelmann R., Wandinger U., Seifert P.   +5 more
doaj   +1 more source

Microstructure, Thermal Transport, and Dry‐Sliding Tribology of Powder‐Metallurgy Al7075 Composites Reinforced With Sol–Gel‐Derived ZnO–rGO Hybrid Nanoparticles

Advanced Engineering Materials, EarlyView.
Sol–gel‐derived ZnO–rGO hybrid nanoparticles enable Al7075 powder‐metallurgy composites to achieve concurrent gains in hardness and thermal conductivity while markedly lowering friction and wear. The hybrid architecture couples ZnO‐based load support with rGO‐assisted lamellar sliding and heat spreading, revealing a promising route toward lightweight ...
Bunyamin Aksakal, Cevher Kursat Macit, Merve Ayık, Hakan Tutumlu   +3 more
wiley   +1 more source

Stabilization of coherent precipitates in nanoscale thin films

Philosophical Magazine, 2015
Coherent precipitates, on growth beyond a critical size (), become semi-coherent by the presence of interfacial misfit edge dislocations. In the case of precipitation in ‘small’ domains (matrix), the strain energy of the precipitate is altered with respect to its value in bulk domains, due to a lesser volume of strained material and domain deformations,
Rani, Pooja, Kumar, Arun, Vishwanadh, B., Bhattacharyya, Somnath, Tewari, R., Subramaniam, Anandh   +5 more
openaire   +1 more source

Advanced Electron Microscopy and Microcomputed Tomography Analysis of Single‐Crystal Ni‐Base Superalloys After Short‐Term Multiaxial Creep

Advanced Engineering Materials, EarlyView.
This work studies the anisotropic behavior of circular notched tensile specimens of Ni‐base superalloy single crystals during high‐temperature tensile creep along [001], [110], and [111]. Correlative scale‐bridging imaging of specimens reveals early rupture along [110] because 1) plastic deformation proceeds faster at notch center; 2) more (brittle ...
Leonardo Agudo Jácome, Lijie Cao, Christoph Somsen, Johannes Boes, René Hesse, Werner Theisen, Gunther Eggeler   +6 more
wiley   +1 more source