Acta materialia, Vol. 58 N° 3. Acta materialia - Fevrier 2010
| Titre : | Acta materialia, Vol. 58 N° 3. Acta materialia - Fevrier 2010 |
| Type de document : | Bulletin |
| Paru le : | 09/03/2010 |
Dépouillements
Article : texte imprimé
Karthik Guda Vishnu, Auteur ;
Alejandro Strachan, Auteur
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We used density functional theory to characterize various crystalline phases of NiTi alloys: (i) high-temperature austenite phase B2; (ii) orthorhombic B19; (iii) the monoclinic martensite phase B19′; and (iv) a body-centered orthorhombic phase [...]
Article : texte imprimé
Y. C. Liu, Auteur ;
F. Sommer, Auteur ;
E. J. Mittemeijer, Auteur
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Differential dilatometry has been employed to study the kinetics of the massive ferrite (α) → austenite (γ) transformation upon isochronal heating (i.e. austenitization) of the substitutional Fe–2.96 at.% Ni alloy subjected to a range of applied[...]
Article : texte imprimé
V. Corral-Flores, Auteur ;
D. Bueno-Baqués, Auteur ;
R. F. Ziolo, Auteur
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Novel multiferroic nanostructures of cobalt ferrite–barium titanate were synthesized by a two-step wet chemical procedure, combining co-precipitation and sol–gel techniques.
The fraction of cobalt ferrite in the nanostructures was varied from 2[...]
Article : texte imprimé
Cedric J. Gommes, Auteur ;
Heiner Friedrich, Auteur ;
Petra E. de Jongh, Auteur
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Electron tomography is a unique technique for imaging the microstructure of materials with a nanometer resolution.
The signal-to-noise ratio of electron tomograms is, however, often too low for a reliable segmentation-based image analysis.
We [...]
Article : texte imprimé
Badri K. Narayanan, Auteur ;
L. Kovarik, Auteur ;
Peter M. Sarosi, Auteur
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Ferritic weld metal deposited with a self-shielded arc-welding process has intentional additions of aluminum, magnesium, titanium and zirconium.
This results in a complex precipitation process that has been characterized with a combination of e[...]
Article : texte imprimé
Olivier Paquet, Auteur ;
Mohammed Krouit, Auteur ;
Julien Bras, Auteur
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Two cellulosic substrates (microcrystalline cellulose, MCC, and bleached kraft softwood pulps, BSK) were grafted by polycaprolactone (PCL) chains with different molecular weights, following a three-step procedure using non-swelling conditions in[...]
Article : texte imprimé
A. Balakrishnan, Auteur ;
P. Pizette, Auteur ;
C. L. Martin, Auteur
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This work describes the compaction of agglomerated and aggregated ceramic powders with special emphasis on the role of primary particle size.
Discrete element simulations are used to model weakly bonded agglomerates as well as strongly bonded a[...]
Article : texte imprimé
Amy Novick-Cohen, Auteur ;
Olga Zelekman-Smirin, Auteur ;
Arkady Vilenkin, Auteur
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Using numerical computations and asymptotic analysis, we study the effects of grain grooves on grain boundary migration in nanofilms, focusing for simplicity on axisymmetric bicrystals containing an embedded cylindrical grain located at the orig[...]
Article : texte imprimé
Q. Y. Qiu, Auteur ;
R. Mahjoub, Auteur ;
S. P. Alpay, Auteur
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The phase stability of ultra-thin (0 0 1) oriented ferroelectric PbZr1–xTixO3 (PZT) epitaxial thin films as a function of the film composition, film thickness, and the misfit strain is analyzed using a non-linear Landau–Ginzburg–Devonshire therm[...]
Article : texte imprimé
K. Du, Auteur ;
F. Ernst, Auteur ;
M. C. Pelsozy, Auteur
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We study the atomistic structure of Pt catalyst nanoparticles using HRTEM (high-resolution transmission electron microscopy).
The particles exhibit a faceted, cubo-octahedral shape, extended planar defects, and mono-atomic surface steps.
HRTEM[...]
Article : texte imprimé
Kyosuke Kishida, Auteur ;
Masakazu Fujiwara, Auteur ;
Hiroki Adachi, Auteur
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The deformation behavior of Ti5Si3 single crystals with the hexagonal D88 structure has been investigated in compression as a function of crystal orientation in a temperature range from 1200 to 1500 °C.
Three different types of deformation mode[...]
Article : texte imprimé
M. Bianchi, Auteur ;
F. Scarpa, Auteur ;
C. W. Smith, Auteur
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Shape memory is the property of a material to remember its original shape despite subsequent plastic deformation.
The exposure to specific temperature profiles induces a shape memory effect on auxetic (negative Poisson’s ratio) foam specimens, [...]
Article : texte imprimé
Flower-shaped SnO2 nanoplates were successfully synthesized via a simple hydrothermal treatment of a mixture of tin(II) dichloride dihydrate (SnCl2·2H2O) and sodium citrate (Na3C6H5O7·2H2O) in alkali solution.
The obtained SnO2 nanoplates were [...]
Article : texte imprimé
Y. H. Wen, Auteur ;
J. V. Lill, Auteur ;
S. L. Chen, Auteur
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A ternary phase-field model was developed that is linked directly to commercial CALPHAD software to provide quantitative thermodynamic driving forces.
A recently available diffusion mobility database for ordered phases is also implemented to gi[...]
Article : texte imprimé
J. A. Brown, Auteur ;
N. M. Ghoniem, Auteur
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Through computer simulations, we show that plasticity in twinned copper nanopillars can be either reversible or irreversible depending on the applied stress state.
Copper nanopillars, containing twinned crystals, are subjected to both compressi[...]
Article : texte imprimé
Nobuo Nakada, Auteur ;
Hidetoshi Ito, Auteur ;
Yoshikazu Matsuoka, Auteur
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We investigate deformation-induced martensitic transformation behavior in cold-rolled and cold-drawn specimens of type 316 stainless steel.
Deformation-induced martensite preferentially nucleates at the twin boundary between the austenite matri[...]
Article : texte imprimé
Q. S. Zhang, Auteur ;
W. Zhang, Auteur ;
G. Q. Xie, Auteur
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This paper reports a novel class of Zr–Cu–Fe–Al bulk metallic glasses (BMGs) with high Zr content and unusual deformation behavior.
Higher content of Zr results in lower hardness, but favors the generation of highly localized shear bands, even [...]
Article : texte imprimé
A. Vannozzi, Auteur ;
Gy Thalmaier, Auteur ;
A. A. Armenio, Auteur
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Ni–Cu–Co alloys were studied for the development of textured substrates for YBCO-coated conductor application.
Three compositions were obtained by adding a fixed amount of 3 at.% Co to the binary NixCu100−x, where x = 40, 50 and 60.
Cube textu[...]
Article : texte imprimé
Megumi Kawasaki, Auteur ;
Byungmin Ahn, Auteur ;
Terence G. Langdon, Auteur
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Experiments were conducted to evaluate the microstructural evolution occurring in the Zn–22% Al eutectoid alloy when processed by high-pressure torsion (HPT) over a range of experimental conditions.
Processing by HPT reduces the grain size and [...]
Article : texte imprimé
A. Mottura, Auteur ;
N. Warnken, Auteur ;
M. K. Miller, Auteur
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Atom probe tomography (APT) is used to characterise the distributions of rhenium in a binary Ni–Re alloy and the nickel-based single-crystal CMSX-4 superalloy.
A purpose-built algorithm is developed to quantify the size distribution of solute c[...]
Article : texte imprimé
C.M. Weyant, Auteur ;
J. Almer, Auteur ;
K. T. Faber, Auteur
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High-energy X-rays were used to determine the local phase composition and residual stresses through the thickness of as-sprayed and heat-treated plasma-sprayed thermal barrier coatings consisting of a NiCoCrAlY bond coat and an yttria-stabilized[...]
Article : texte imprimé
Junghwan Kim, Auteur ;
Kicheol Kang, Auteur ;
Sanghoon Yoon, Auteur
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Cu-based bulk metallic glass (BMG) coatings were built-up by the atmospheric plasma spraying (APS) process at different hydrogen flow rates.
As the hydrogen flow rate increased, thermal energy in the plasma jet increased the melting state of th[...]
Article : texte imprimé
A. Molinari, Auteur ;
S. Libardi, Auteur ;
M. Leoni, Auteur
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The thermal stability of a nanocrystalline Fe–1.5 wt.% Mo powder milled with nano-SiO2 was investigated in situ by synchrotron radiation X-ray diffraction.
Crystallite size is stabilized by the grain-boundary strain, therefore grain growth star[...]
Article : texte imprimé
Mechanical behaviour and in situ observation of shear bands in ultrafine grained Pd and Pd–Ag alloys
K. Yang, Auteur ;
Yu. Ivanisenko, Auteur ;
A. Caron, Auteur
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An in situ tensile test with grey scale correlation has been performed to study the deformation process in ultrafine grained (UFG) Pd and Pd–x at.% Ag (x = 5 or 20) alloys produced by high-pressure torsion.
Shear band nucleation and propagatio[...]
Article : texte imprimé
V. Phatak, Auteur ;
A. Gupta, Auteur ;
V. R. Reddy, Auteur
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The effect of nitrogen incorporation on the kinetics of L10 transformation in FePt alloy films was studied.
Films with a maximum possible amount of nitrogen were prepared by sputtering a FePt compound target with pure nitrogen.
As-prepared fil[...]
Article : texte imprimé
S. Jana, Auteur ;
R. S. Mishra, Auteur ;
J. B. Baumann, Auteur
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Cast aluminum alloys in general show poor fatigue performance due to the presence of defects.
Friction stir processing (FSP) can be used as a tool to enhance the mechanical properties of cast alloys by eliminating such defects.
In the present [...]
Article : texte imprimé
A. Artemev, Auteur ;
A. Roytburd, Auteur
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This study investigates the spinodal mechanism of domain formation and switching through the loss of stability of a single-domain (SD) state with respect to a polydomain (PD) state in thin ferroelectric films with dead layers.
The macroscopic t[...]
Article : texte imprimé
D. Favez, Auteur ;
J.-D. Wagnière, Auteur ;
M. Rappaz, Auteur
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In order to better understand the microstructure that forms during laser welding of an 18 carat gold and an austenitic stainless steel, solidification of the Au–Fe binary analog has been studied using thermal analysis and interrupted Bridgman ex[...]
Article : texte imprimé
J. Caris, Auteur ;
J. J. Lewandowski, Auteur
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The effects of normal stress/superimposed pressure on the flow/fracture of two different zirconium-based glasses and a hafnium-based bulk metallic glass (BMG) tested at Case Western Reserve University is presented.
These results are compared wi[...]
Article : texte imprimé
C. S. Pande, Auteur ;
G. B. McFadden, Auteur
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In this paper, a stochastic formulation of three-dimensional grain growth is presented.
This formulation employs the recent extension of the von Neumann law to three dimensions, and leads to a Fokker–Planck equation for the size distribution.
[...]
Article : texte imprimé
Christopher D. Taylor, Auteur ;
Turab Lookman, Auteur ;
R. Scott Lillard
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Total energy calculations based on density functional theory (DFT) have been performed for various uranium–hydrogen configurations relevant to the uranium hydriding reaction.
Herein, we investigate the transformation of the supersaturated α-U l[...]
Article : texte imprimé
J. A. Sekhar, Auteur ;
H. P. Li, Auteur ;
G. K. Dey, Auteur
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A relationship is inferred between dissipative reactions, nanocrystal formation and nanobands in micropyretically synthesized equimolar Ni–Al alloys.
Various microkinetic mechanisms may be operative, depending on the chosen processing condition[...]
Article : texte imprimé
Paul E. Krajewski, Auteur ;
Louis G. Hector, Auteur ;
Ningning Du, Auteur
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A multiscale model for predicting elevated temperature deformation in Al–Mg alloys is presented.
Constitutive models are generated from a theoretical methodology and used to investigate the effects of grain size on formability.
Flow data are c[...]
Article : texte imprimé
M. Zhang, Auteur ;
F. Bridier, Auteur ;
P. Villechaise, Auteur
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Formation of slip bands plays an important role in deformation and fatigue processes of duplex Ti–6Al–4V.
In this study, shear-enhanced crystal plasticity constitutive relations are proposed to account for the slip softening due to breakdown of[...]
Article : texte imprimé
P. Pant, Auteur ;
J. D. Budai, Auteur ;
J. Narayan, Auteur
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Using high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction, we investigated the strain relaxation mechanisms for nonpolar (1 1 −2 0) a-plane ZnO epitaxy on (1 −1 0 2) r-plane sapphire, where the in-plane misfit ranges f[...]
Article : texte imprimé
Y. Koizumi, Auteur ;
T. Fujita, Auteur ;
Y. Minamino, Auteur
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The effects of plastic deformation on lamellar structure formation in solution-treated Ti–39 at.% Al single crystals were investigated, focusing on the role of dislocations of different slip systems.
The dislocations were introduced by indentat[...]
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