Acta materialia, Vol. 58 N° 5. Acta materialia - Mars 2010
| Titre : | Acta materialia, Vol. 58 N° 5. Acta materialia - Mars 2010 |
| Type de document : | Bulletin |
| Paru le : | 12/12/2011 |
Dépouillements
Article : texte imprimé
Arnaud Metsue, Auteur ;
Philippe Carrez, Auteur ;
Christophe Denoual, Auteur
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In this paper, we determine dislocation core structures and Peierls stresses of wadsleyite, a high-pressure mineral present in the Earth mantle. We use a Peierls–Nabarro model combined with a finite-element method in which we introduce two-dimen[...]
Article : texte imprimé
C. Efstathiou, Auteur ;
H. Sehitoglu, Auteur
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We identify the role of deformation twinning and twin–twin intersections on the strain hardening behavior of Hadfield steel single crystals using strain field measurements. In situ and ex situ strain field measurements resolved at micrometer len[...]
Article : texte imprimé
V. Cloet, Auteur ;
T. Thersleff, Auteur ;
O. Stadel, Auteur
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A water-based precursor solution was used to deposit a thin La2Zr2O7 layer (70 nm) on a NiW substrate. The characterization of the La2Zr2O7 (LZO) consisted of X-ray diffraction, pole figures, reflection high-energy electron diffraction, scanning[...]
Article : texte imprimé
M. A. Azeem, Auteur ;
A. Tewari, Auteur ;
S. Mishra, Auteur
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Microstructure and microtexture evolution during static annealing of a hot-extruded AZ21 magnesium alloy was studied. Apart from fine recrystallized equiaxed grains and large elongated deformed grains, a new third kind of abnormal grains that ar[...]
Article : texte imprimé
O. Muránsky, Auteur ;
M.R. Barnett, Auteur ;
D. G. Carr, Auteur
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Neutron diffraction and acoustic emission were used in a single in situ experiment in order to study the deformation twinning of two ZM20 Mg alloys with significantly different grain sizes at room temperature. The combination of these two techni[...]
Article : texte imprimé
Kaka Ma, Auteur ;
Feng Tang, Auteur ;
Julie M. Schoenung, Auteur
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NiCrAl alloys are commonly used for the bond coat in thermal barrier coatings (TBCs). Previous work has investigated the effects of intentional chemical additions on phase stability, but there is also a need to consider the effects of unintentio[...]
Article : texte imprimé
J.B. Levine, Auteur ;
J. B. Betts, Auteur ;
J.D. Garrett, Auteur
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The search for superhard materials, driven by their widespread use in industrial applications, highlights one of the most difficult problems in the field of materials science: the accurate characterization of a material’s intrinsic physical prop[...]
Article : texte imprimé
Yong Jiang, Auteur ;
John R. Smith, Auteur ;
G. Robert Odette, Auteur
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Density functional theory calculations have been performed to study the structural, electronic and elastic properties, and formation energies, of pyrochlore Y2Ti2O7 and orthorhombic Y2TiO5. These oxides are among the hardening features in nano-d[...]
Article : texte imprimé
Tsuneaki Matsudaira, Auteur ;
Masashi Wada, Auteur ;
Tomohiro Saitoh, Auteur
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The oxygen permeability of undoped and lutetia-doped polycrystalline alumina wafers that were exposed to oxygen potential gradients was evaluated at temperatures up to 1973 K. The main diffusion species during oxygen permeation through the alumi[...]
Article : texte imprimé
Jianliang Lin, Auteur ;
John J. Moore, Auteur ;
Brajendra Mishra, Auteur
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TiBCN nanocomposite coatings were deposited in a closed field unbalanced magnetron sputtering system using pulsed magnetron sputtering of a TiBC compound target with various Ar/N2 mixtures. TiBCN coatings were characterized using X-ray diffracti[...]
Article : texte imprimé
Caizhi Zhou, Auteur ;
S. Bulent Biner, Auteur ;
Richard LeSar, Auteur
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Discrete dislocation dynamics simulations in three dimensions have been used to examine the role of dislocation multiplication and mobility on the plasticity in small samples under uniaxial compression. To account for the effects of the free sur[...]
Article : texte imprimé
M. Kerr, Auteur ;
M.R. Daymond, Auteur ;
R. A. Holt, Auteur
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This paper describes the use of synchrotron X-ray diffraction to map crack tip strain field evolution and initiation of twinning under applied load in a fatigue pre-cracked zirconium alloy. Compact tension specimens were machined in two orientat[...]
Article : texte imprimé
E. Rabkin, Auteur ;
J.K. Deuschle, Auteur ;
B. Baretzky, Auteur
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Quasi-static nanoindentation tests were performed on polycrystalline Ni films sputter deposited on basal plane-oriented sapphire substrates. In the majority of tests a combined elasto-plastic response of the film was observed, without detectable[...]
Article : texte imprimé
J-B. Yang, Auteur ;
Z.-G. Yang, Auteur ;
Y. Nagai, Auteur
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A crystallographic model of face-centered cubic/body-centered cubic martensitic nucleation and growth has been developed in which the glissile martensitic interface is described in terms of discrete transformation and misfit dislocations within [...]
Article : texte imprimé
Matthias Bensch, Auteur ;
Johannes Preußner, Auteur ;
Rainer Hüttner, Auteur
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Creep test results of thin-walled specimens of the single-crystal nickel-base superalloy René N5 at 980 °C under vacuum as well as under air show different creep properties depending on material thickness and atmosphere. The differences in creep[...]
Article : texte imprimé
Parikshith K. Kumar, Auteur ;
Dimitris C. Lagoudas, Auteur
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The influence of viscoplastic phenomena on the transformation behavior of a Ti50Pd40Ni10 high-temperature shape memory alloy (HTSMA) is investigated by thermomechanical testing followed by transmission electron microscopy (TEM). An ingot of the [...]
Article : texte imprimé
R. Quey, Auteur ;
D. Piot, Auteur ;
J.H. Driver, Auteur
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A split sample of Al–0.1%Mn has been deformed by a series of compression tests in a channel-die at 400 °C to a final strain of 1.6. The orientations of 176 grains in a View the MathML source internal surface were followed by high-resolution elec[...]
Article : texte imprimé
Y. Huang, Auteur ;
J.D. Robson, Auteur ;
P.B. Prangnell, Auteur
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The grain size achievable and long-term stability of a severely deformed aluminium copper alloy have been investigated when copper is used in solution to inhibit recovery. It is shown that copper is more effective than magnesium in inhibiting dy[...]
Article : texte imprimé
S.L. Wong, Auteur ;
P.R. Dawson, Auteur
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Crystal-based finite element simulations have been conducted on virtual face-centered cubic polycrystals under uniaxial tensile loading to study the influence of single crystal elastic anisotropy on the elastic–plastic transition behavior exhibi[...]
Article : texte imprimé
Nanshu Lu, Auteur ;
Zhigang Suo, Auteur ;
Joost J. Vlassak, Auteur
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We perform uniaxial tensile tests on polyimide-supported copper films with a strong (1 1 1) fiber texture and with thicknesses varying from 50 nm to 1 μm. Films with thicknesses below 200 nm fail by intergranular fracture at elongations of only [...]
Article : texte imprimé
Jiagang Wu, Auteur ;
John Wang, Auteur
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BiFeO3 (BFO) thin films of varying degrees of (1 1 1) orientation were successfully grown on SrRuO3-buffered Pt/TiO2/SiO2/Si(1 0 0) substrates by off-axis radio-frequency magnetron sputtering. They demonstrate much enhanced ferroelectric behavio[...]
Article : texte imprimé
H.W. Zhang, Auteur ;
X. Huang, Auteur ;
R. Pippan, Auteur
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Polycrystalline Ni of two purities (99.967% (4N) and 99.5% (2N)) was deformed to an ultra-high strain of εvM = 100 (εvM, von Mises strain) by high pressure torsion at room temperature. The 4N and 2N samples at this strain are nanostructured with[...]
Article : texte imprimé
X.J. Gu, Auteur ;
S.J. Poon, Auteur ;
G.J. Shiflet, Auteur
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The effects of changes in sample dimensions on the compressive plasticity and fracture toughness/energy have been determined for Ti40Zr25Cu12Ni3Be20 bulk metallic glass (BMG). Changes in sample dimensions alone produced widely different values f[...]
Article : texte imprimé
S. Hayun, Auteur ;
M. P. Dariel, Auteur ;
N. Frage, Auteur
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The dynamic high-strain-rate behavior of boron carbide-based composites with similar phase composition yet different microstructural features, namely, amount of residual silicon, average grain size and morphology of the SiC particles, was invest[...]
Article : texte imprimé
Y. Li, Auteur ;
W. Liu, Auteur ;
V. Ortalan, Auteur
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The presence of aluminum nitride in nanostructured aluminum metal matrix composites was studied by high resolution transmission electron microscopy, electron energy loss spectroscopy, energy dispersive X-ray spectroscopy analysis and electron mi[...]
Article : texte imprimé
Belén F. Alfonso, Auteur ;
Camino Trobajo, Auteur ;
Carmen Piqué, Auteur
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Interest in Fe(ND3)2PO4, one of the first three-dimensional structurally linked solids forming Fe–ND3 bonds, has been renewed recently due to the observation of structural and magnetic phase transitions. This paper reports powder neutron diffrac[...]
Article : texte imprimé
G. Boussinot, Auteur ;
E. A. Brener, Auteur ;
D.E. Temkin, Auteur
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We present phase-field simulations of isothermal phase transformations in the peritectic system below and above the peritectic temperature. The physical processes involved are of different natures, involving either a triple junction or a liquid-[...]
Article : texte imprimé
Mikaël Perrut, Auteur ;
Andrea Parisi, Auteur ;
Silvère Akamatsu, Auteur
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In directional solidification, a sample is pulled in an externally imposed temperature gradient. When the pulling direction and the temperature gradient are not perfectly aligned, a transverse temperature gradient is generated in the sample. We [...]
Article : texte imprimé
E. Panda, Auteur ;
L.P.H. Jeurgens, Auteur ;
E. J. Mittemeijer, Auteur
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A thermodynamic model has been presented for the prediction of the type of initial, amorphous oxide overgrowth (i.e. am-Al2O3, am-MgO or am-MgAl2O4) on bare AlMg substrates as a function of the Mg alloying element content at the substrate/oxide [...]
Article : texte imprimé
László S. Tóth, Auteur ;
Yuri Estrin, Auteur ;
Rimma Lapovok, Auteur
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A new model is proposed that aims to capture within a single modelling frame all the main microstructural features of a severe plastic deformation process. These are: evolution of the grain size distribution, misorientation distribution, crystal[...]
Article : texte imprimé
R.K.W. Marceau, Auteur ;
G. Sha, Auteur ;
R.N. Lumley, Auteur
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The evolution of an atomistic-level nanostructure during the early stages of secondary ageing of a rapid hardening Al–1.1Cu–1.7Mg (at.%) alloy has been characterized by a combination of atom probe tomography (APT) and transmission electron micro[...]
Article : texte imprimé
M. Brocq, Auteur ;
B. Radiguet, Auteur ;
J.-M. Le Breton, Auteur
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Reactive ball milling and annealing is proposed as a new production method for oxide dispersion strengthened (ODS) steels. A highly concentrated Fe–38 atm.% Y2O3 ODS model alloy was processed by reactive ball milling and annealing of YFe3 and Fe[...]
Article : texte imprimé
Article : texte imprimé
O. Haruyama, Auteur ;
Y. Nakayama, Auteur ;
R. Wada, Auteur
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The structural relaxation in a Zr55Cu30Ni5Al10 bulk metallic glass was investigated by volume and enthalpy relaxation at various temperatures. The relaxation kinetics was well described by a stretched exponential relaxation function, Φ(t)=exp[-([...]
Article : texte imprimé
Juliette Chevy, Auteur ;
Claude Fressengeas, Auteur ;
Mikhail Lebyodkin, Auteur
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Hard X-ray diffraction experiments have provided evidence of a strongly heterogeneous distribution of dislocation densities along the axis of cylindrical ice single crystals oriented for basal slip in torsion creep. The dislocation arrangements [...]
Article : texte imprimé
On the multiplication of dislocations during martensitic transformations in NiTi shape memory alloys
In situ and post-mortem diffraction contrast transmission electron microscopy (TEM) was used to study the multiplication of dislocations during a thermal martensitic forward and reverse transformation in a NiTi shape memory alloy single crystal.[...]
Article : texte imprimé
B.R. Winton, Auteur ;
M. Ionescu, Auteur ;
S.X. Dou, Auteur
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Elastomer films with three-dimensional features self-organized into coherent and semi-coherent buckling domains were created by implanting different species of metal ions and combinations thereof, using a metal evaporation ion source, into quali[...]
Article : texte imprimé
Z. Tang, Auteur ;
T. Rewcharoon, Auteur ;
Y. Nagai, Auteur
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Vanadium samples with controlled oxygen impurity of up to 2460 at. ppm were irradiated with fast neutrons to a fluency of View the MathML source at 150 °C. The irradiation-induced nanovoids and the interaction between the defects and the oxygen [...]
Article : texte imprimé
Eralp Demir, Auteur ;
Dierk Raabe, Auteur ;
Franz Roters, Auteur
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Single crystalline copper beams with thicknesses between 0.7 and 5 μm are manufactured with a focused ion beam technique and bent in a nanoindenter. The yield strengths of the beams show a mechanical size effect (smaller-is-stronger). The geomet[...]
Article : texte imprimé
L.E. Murr, Auteur ;
S.M. Gaytan, Auteur ;
A. Ceylan, Auteur
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Intermetallic, γ-TiAl, equiaxed, small-grain (∼2 μm) structures with lamellar γ/α2-Ti3Al colonies with average spacing of 0.6 μm have been fabricated by additive manufacturing using electron beam melting (EBM) of precursor, atomized powder. The [...]
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