Acta materialia, Vol. 58 N° 2. Acta materialia - Janvier 2010
| Titre : | Acta materialia, Vol. 58 N° 2. Acta materialia - Janvier 2010 |
| Type de document : | Bulletin |
| Paru le : | 18/04/2010 |
Dépouillements
Article : texte imprimé
Doh Won Jung, Auteur ;
Keith L. Duncan, Auteur ;
Eric D. Wachsman, Auteur
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Dysprosium- and tungsten-stabilized bismuth oxide (DWSB) electrolytes were developed to achieve higher conductivity.
With double doping, stabilization of the cubic phase was achieved with as little as 12 mol.% total dopant concentration, result[...]
Article : texte imprimé
Emanuel A. Lazar, Auteur ;
Robert D. MacPherson, Auteur ;
David J. Srolovitz, Auteur
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We describe a method for evolving two-dimensional polycrystalline microstructures via mean curvature flow that satisfies the von Neumann–Mullins relation with an absolute error O(Δt2).
This is a significant improvement over a different method c[...]
Article : texte imprimé
Noppadon Sathitsuksanoh, Auteur ;
Dake Wang, Auteur ;
HongYun Yang, Auteur
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ZnO nanoparticles were encapsulated in the porous activated carbon matrix by incipient-wetness impregnation.
The use of the small host matrix allowed the size confinement of ZnO by utilizing the porous nature of the host matrix.
Partial fixati[...]
Article : texte imprimé
Rémy Besson, Auteur
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The aim of this work is to give the independent-point-defect thermodynamics of ordered compounds a sufficiently general flavour, adapted to and working for multicomponent alloys.
Generalizing previous approaches, we first show that an appropria[...]
Article : texte imprimé
Sergiy V. Divinski, Auteur ;
Gerrit Reglitz, Auteur ;
Gerhard Wilde, Auteur
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Grain boundary self-diffusion in Ni materials of two different purity levels (99.6 and 99.999 wt.%) was measured over wide temperature intervals using the radiotracer technique and applying the 63Ni radioisotope.
The diffusion experiments were [...]
Article : texte imprimé
Wenwu Xu, Auteur ;
Xiaoyan Song, Auteur ;
Nianduan Lu, Auteur
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Nanocrystalline alloys exhibit apparently different phase transformation characteristics in comparison to the conventional polycrystalline alloys.
The special phase stability and phase transformation behavior, as well as the essential mechanism[...]
Article : texte imprimé
Jun Jie Niu, Auteur ;
Jian Nong Wang, Auteur
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The dependence on temperature and structure of the electrochemical activity of a catalyst supported on hollow carbon nanocages (HCNCs) with large scales (> 5 g h–1) by a simple N2-bubbling floating method is discussed.
The effect of gas flow on[...]
Article : texte imprimé
Yanwu Zhu, Auteur ;
Yousheng Zhang, Auteur ;
Ling Dai, Auteur
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Vanadium oxide nanobelts have been synthesized on Si or SiN substrates by simply heating vanadium foils on a hotplate.
As-grown nanobelts were characterized as V2O5·nH2O (0.3 < n < 1.7) layer structures containing water molecular intercalatio[...]
Article : texte imprimé
A. Gali, Auteur ;
H. Bei, Auteur ;
E.P. George, Auteur
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Microalloying with 0.01 at.% B decreases the range of growth speeds over which a well-aligned fibrous eutectic microstructure can be obtained in directionally solidified NiAl–Mo.
Compared to the undoped alloy, the size/spacing of the Mo fibers [...]
Article : texte imprimé
W. Dmowski, Auteur ;
Y. Yokoyama, Auteur ;
A. Chuang, Auteur
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Using high-energy X-ray diffraction we examined the atomic structure in bulk metallic glass samples which underwent severe plastic deformation by the high-pressure torsion (HPT) technique.
We obtained the atomic pair distribution function (PDF)[...]
Article : texte imprimé
B. L. Boyce, Auteur ;
M.J. Shaw, Auteur ;
P. Lu, Auteur
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Few studies have deliberately varied the microstructure of microfabricated polycrystalline silicon (polySi) to examine their effects on resulting mechanical performance and reliability.
In the present study, the tensile strength distributions o[...]
Article : texte imprimé
Emre S. Tasci, Auteur ;
Marcel H.F. Sluiter, Auteur ;
Alain Pasturel, Auteur
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A new crystalline ground state was discovered in the Au–Si system through first-principles electronic structure calculations.
The new structure was found using the experimentally and theoretically determined local atomic structure in the liquid[...]
Article : texte imprimé
Matthew L. Scullin, Auteur ;
Jayakanth Ravichandran, Auteur ;
Choongho Yu, Auteur
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We report a generic method for fast and efficient reduction of strontium titanate (SrTiO3, STO) single crystals by pulsed laser deposition (PLD) of thin-films.
The reduction was largely independent of the thin-film material deposited on the cry[...]
Article : texte imprimé
Y.M. Zhu, Auteur ;
A.J. Morton, Auteur ;
M. Weyland, Auteur
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The planar features in a Mg–8Y–2Zn–0.6Zr (wt.%) alloy solution-treated at 500°C for 1 h have been examined using conventional transmission electron microscopy and atomic-resolution high-angle annular dark-field scanning transmission electron mic[...]
Article : texte imprimé
C. S. T. Chang, Auteur ;
B. J. Duggan, Auteur
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In this study, the textures and microstructures of Al–5%Mg after cold rolling 95% and recrystallization at 300 and 450°C have been investigated.
The cold rolling textures were typical but the recrystallization textures at 300°C comprised Cube a[...]
Article : texte imprimé
Jia Ye, Auteur ;
Raja K. Mishra, Auteur ;
Alan R. Pelton, Auteur
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We report on quantitative in situ transmission electron microscopy nanocompression tests used to study the deformation behavior of NiTi pillars on the nanometer scale.
By recording the diffraction patterns in real time we have obtained direct e[...]
Article : texte imprimé
R. Dakhlaoui, Auteur ;
V. Klosek, Auteur ;
M.H. Mathon, Auteur
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We propose a methodology associating texture determinations and strains measurements by neutron diffraction in order to analyse the stress fields within families of crystallites with the same crystallographic orientation in polycrystalline mater[...]
Article : texte imprimé
Xiaohui Liu, Auteur ;
Jianfeng Gu, Auteur ;
Yao Shen, Directeur de thèse
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A lattice dynamical finite-element method (LDFEM) is proposed for multiscale analysis of stressed complex crystals.
Interatomic potential is embedded into the constitutive relation within the hyperelasticity framework, and two energy-based latt[...]
Article : texte imprimé
Y. Ashkenazy, Auteur ;
R. S. Averback, Auteur
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Crystallization velocities in several face-centered-cubic (fcc) and body-centered-cubic (bcc) metals are calculated using molecular dynamics computer simulations for the (1 0 0) and densely packed (1 1 1) or (1 1 0) planar interfaces.
We show t[...]
Article : texte imprimé
Dongwon Shin, Auteur ;
Christopher Wolverton, Auteur
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Solute–vacancy binding is a key quantity in understanding diffusion kinetics, and may also have a considerable impact on the hardening response in Mg alloys.
However, the binding energetics between solute impurities and vacancies in Mg are noto[...]
Article : texte imprimé
Ying Yang, Auteur ;
H. Bei, Auteur ;
Shuanglin Chen, Auteur
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Understanding the stability of the three-phase Mo_ss + Mo3Si + Mo5SiB2 region is important for alloy design of Mo–Si–B-based refractory metal intermetallic composites.
In this work, thermodynamic modeling is coupled with guided experiments to [...]
Article : texte imprimé
Fang Cao, Auteur ;
Irene J. Beyerlein, Auteur ;
Francis L. Addessio, Auteur
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Shock recovery experiments have been conducted to assess the role of shock stress and orientation dependence on substructure evolution and deformation twinning of a [1 0 0]/View the MathML source copper bicrystal.
Transmission electron microsc[...]
Article : texte imprimé
Qijin Cheng, Auteur ;
Shuyan Xu, Auteur ;
Kostya (Ken) Ostrikov, Auteur
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A simple, effective and innovative approach based on low-pressure, thermally nonequilibrium, high-density inductively coupled plasmas is proposed to rapidly synthesize Si quantum dots (QDs) embedded in an amorphous SiC (a-SiC) matrix at a low su[...]
Article : texte imprimé
D. Pinisetty, Auteur ;
R.V. Devireddy, Auteur
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In the present study, the thermal conductivity of superlattice bismuth–telluride (semiconductor)–antimony (semimetal) (Bi2Te3–Sb) nanostructures (nanowires and nanotubes) has been modeled using an incoherent particle model, approximating all the[...]
Article : texte imprimé
Alexander Tkach, Auteur ;
Paula M. Vilarinho, Auteur ;
Dmitry Nuzhnyy, Auteur
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SrTiO3:Mn ceramics, prepared according to the chemical formulae Sr1–xMnxTiO3 and SrTi1–yMnyO3, are studied by Fourier transform infrared and time-domain terahertz spectroscopy in the temperature range of 10–300 K to support the incorporation of [...]
Article : texte imprimé
M.Y. He, Auteur ;
A.G. Evans, Auteur
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Cracks in superalloys subject to an isothermal, sustained hold, compressive strain cycle experience cycle-by-cycle extension.
The phenomenon has been attributed to the strains induced by the formation a thermally grown oxide (TGO) on the crack [...]
Article : texte imprimé
Sangbong Yi, Auteur ;
Jan Bohlen, Auteur ;
Frank Heinemann, Auteur
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The influence of the initial microstructure on the deep drawability and the associated microstructural evolution in two different magnesium alloy sheets, AZ31 and ZE10, has been examined.
Tensile testing at room temperature shows that the AZ31 [...]
Article : texte imprimé
Katsuyoshi Kondoh, Auteur ;
Masashi Kawakami, Auteur ;
Hisashi Imai, Auteur
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The wetting behavior of molten pure Mg droplets on pure Ti substrate, a crucial phenomenon in the design of Mg matrix composites reinforced with Ti particles, was investigated by the sessile drop method.
The contact angle was measured in high-p[...]
Article : texte imprimé
Cheuk-Yu Lee, Auteur ;
Zbigniew H. Stachurski, Auteur ;
T. Richard Welberry, Auteur
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Clusters of atoms can be divided into three categories depending on their topology.
One of the categories provides the basis for development of a model of a perfectly random structure (ideal amorphous solid) using the non-equilateral triangle t[...]
Article : texte imprimé
B. Chéhab, Auteur ;
Y. Bréchet, Auteur ;
M. Véron, Auteur
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High-temperature ductility of dual-phase stainless steels is investigated using a micromechanics approach of damage and fracture.
Two different microstructures are studied with either a lamellar or a globular morphology of the ferrite phase, th[...]
Article : texte imprimé
Donald F. Johnson, Auteur ;
Emily A. Carter, Auteur
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We characterize the ability of two potential surface alloys, FeAl and Fe3Si, to prevent H incorporation into steel, with a view toward inhibiting steel embrittlement.
Periodic density functional theory calculations within the generalized gradie[...]
Article : texte imprimé
Yoji Mine, Auteur ;
Zenji Horita, Auteur ;
Yukitaka Murakami, Auteur
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The effect of high-pressure torsion (HPT) on hydrogen trapping in Fe–0.01 mass% C and type 310S stainless steel was studied by metallographic characterization and hydrogen measurement after hydrogen gas charging.
Hardening of both materials aft[...]
Article : texte imprimé
R. Gremaud, Auteur ;
C. P. Broedersz, Auteur ;
A. Borgschulte, Auteur
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We monitor the hydrogenation of PTFE/Pd-capped MgyNi1−yHx gradient thin films using the change in optical transmission as a function of time, temperature and hydrogen pressure, to study the relation between kinetics and thermodynamics of hydrog[...]
Article : texte imprimé
Leonardo Cipolla, Auteur ;
Hilmar K. Danielsen, Auteur ;
Dario Venditti, Auteur
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A 12% Cr model steel was designed with the purpose of studying the nucleation and growth of modified Z-phase, Cr(V,Nb)N.
The model alloy develops Z-phase after relatively short ageing times and contains only nitrides of Cr, V and Nb.
Interfere[...]
Article : texte imprimé
Rosa Robert, Auteur ;
Dmitry Logvinovich, Auteur ;
Myriam H. Aguirre, Auteur
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The influence of the partial substitution of Co by Ti in the LaCoO3 perovskite system is studied by evaluating the electrical conductivity, the Seebeck coefficient and the thermal conductivity of the compounds up to T = 1273 K.
The X-ray diffra[...]
Article : texte imprimé
J. Rodríguez-Aseguinolaza, Auteur ;
I. Ruiz-Larrea, Auteur ;
M.L. Nó, Auteur
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A single crystal with a selected composition of a Cu–Al–Ni shape memory alloy, undergoing two martensitic phase transformations when cooling from the common parent phase, View the MathML source, has been studied by adiabatic calorimetry.
As the[...]
Article : texte imprimé
Article : texte imprimé
Stephen A. Barr, Auteur ;
Erik Luijten, Auteur
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Upon freezing of an aqueous suspension of colloidal particles, ice platelets or dendrites with high aspect ratios are formed that engulf or reject the particles, depending on their size and the velocity of the advancing ice front.
As the partic[...]
Article : texte imprimé
Sofiane Guessasma, Auteur ;
David Bassir, Auteur
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A hybrid strategy based on artificial neural network/genetic algorithms is suggested to optimize the mechanical properties of cellular solids.
Three-dimensional void structures are generated using a random sequential addition algorithm in which[...]
Article : texte imprimé
H. Yan, Auteur ;
J.C. Zhang, Auteur ;
B.W. Yu, Auteur
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Fluorescent magnetic nanocomposites were successfully synthesized using the self-prepared Fe3O4 magnetic liquid and CdTe quantum dots (QDs) as precursors.
High-resolution transmission electron microscopy, selected area electron diffraction, ene[...]
Article : texte imprimé
Peter Hedström, Auteur ;
Tong-Seok Han, Auteur ;
Ulrich Lienert, Auteur
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The lattice strain tensor evolution for single bulk grains of austenite and ferrite in a duplex stainless steel during tensile loading to 0.02 applied strain has been investigated using in situ high-energy X-ray measurements and finite-element m[...]
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