Acta materialia, Vol. 58 N° 8. Acta materialia - Mai 2010
| Titre : | Acta materialia, Vol. 58 N° 8. Acta materialia - Mai 2010 |
| Type de document : | Bulletin |
| Paru le : | 12/12/2011 |
Dépouillements
Article : texte imprimé
H. Paul, Auteur ;
C. Maurice, Auteur ;
J.H. Driver, Auteur
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The microstructure and microtexture evolution in a deformed Goss oriented crystal were characterized after a sample rotation and consequent change in strain path, over a range of scales by optical microscopy, high resolution scanning electron mi[...]
Article : texte imprimé
J.C. Stinville, Auteur ;
P. Villechaise, Auteur ;
C. Templier, Auteur
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The introduction at moderate temperature of nitrogen in the 316L austenitic stainless steel by plasma nitriding modifies the crystallographic texture in the very near surface region. The evolution of texture components has been quantitatively ch[...]
Article : texte imprimé
P. Moongkhamklang, Auteur ;
V.S. Deshpande, Auteur ;
H.N.G. Wadley, Auteur
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A method has been developed for fabricating millimeter cell size cellular lattice structures with square and diamond collinear truss topologies from 240 μm diameter Ti–6Al–4V-coated SiC monofilaments (titanium matrix composite (TMC) monofilament[...]
Article : texte imprimé
B. S. Chun, Auteur ;
S.D. Kim, Auteur ;
Y.S. Kim, Auteur
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A correlation between composition, microstructure, and magnetic properties of sputter-deposited CoFeSiB alloy films has been studied. Various analytical tools and micromagnetic models were employed to understand the details of microstructural ev[...]
Article : texte imprimé
N. Swaminathan, Auteur ;
Paul J. Kamenski, Auteur ;
Dane Morgan, Auteur
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Cascade simulations in single crystal and nanocrystalline SiC have been conducted in order to determine the role of grain boundaries and grain size on defect production during primary radiation damage. Cascades are performed with 4 and 10 keV si[...]
Article : texte imprimé
E. K. Baumert, Auteur ;
P.-O. Theillet, Auteur ;
O.N. Pierron, Auteur
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This study investigated the cyclic and static fatigue properties of 10 μm thick, deep reactive ion etched, monocrystalline silicon films. Stress–life fatigue curves and fatigue degradation rates vs. stress curves were generated at both 4 and 40 [...]
Article : texte imprimé
J. Madison, Auteur ;
J. Spowart, Auteur ;
D. Rowenhorst, Auteur
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Convection during directional solidification can cause defects such as freckles and misoriented grains. To gain a better understanding of conditions associated with the onset of convective instabilities, flow was investigated using three-dimensi[...]
Article : texte imprimé
Yuichiro Koizumi, Auteur ;
Atsushi Sugihara, Auteur ;
Hiroaki Tsuchiya, Auteur
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The selective dissolution behavior of Ti–41 at.% Al single crystals having a α2/γ-lamellar structure with a lamellar thickness in the range 20 nm to 1 μm have been investigated in 0.5 M NaCl aqueous solution focusing on the effect of lamellar th[...]
Article : texte imprimé
Ohad Levy, Auteur ;
Gus L.W. Hart, Auteur ;
Stefano Curtarolo, Auteur
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Despite the increasing importance of hafnium in numerous technological applications, experimental and computational data on its binary alloys is sparse. In particular, data is scant on those binary systems believed to be phase-separating. We per[...]
Article : texte imprimé
Gunther Schoeck, Auteur
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The Bordoni relaxation in fcc metals is generally assumed to result from thermally activated kink-pair formation in dislocation segments aligned along Peierls valleys in crystallographic close-packed directions. Objections against this interpret[...]
Article : texte imprimé
J. Svoboda, Auteur ;
F.D. Fischer, Auteur ;
R. Abart, Auteur
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In many multi-component systems, phases can be considered stoichiometric. If two phases not stably coexisting are brought into contact, multiple new phases may nucleate at the interface and develop into a sequence of layers with different phase [...]
Article : texte imprimé
Z. Zhou, Auteur ;
W.M. Rainforth, Auteur ;
Q. Luo, Auteur
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TiAlN/VN multilayer coatings exhibit excellent dry sliding wear resistance and low friction coefficient, reported to be associated with the formation of self-lubricating V2O5. To investigate this hypothesis, dry sliding ball-on-disc wear tests o[...]
Article : texte imprimé
M.E. Manley, Auteur
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Recent neutron and X-ray scattering measurements show intrinsic localized modes (ILMs) in metallic uranium and ionic sodium iodide. Here, the role ILMs play in the behavior of these materials is examined. With the thermal activation of ILMs, the[...]
Article : texte imprimé
Y.M. Zhu, Auteur ;
A.J. Morton, Auteur ;
J.F. Nie, Auteur
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The 18R and 14H long-period stacking ordered structures formed in Mg–Y–Zn alloys are examined systematically using electron diffraction and high-angle annular dark-field scanning transmission electron microscopy. In contrast to that reported in [...]
Article : texte imprimé
S. Tarasovs, Auteur ;
J. Andersons, Auteur ;
Y. Leterrier, Auteur
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Evaluation of interfacial toughness of sub-micron-thickness layers deposited on a ductile substrate is a challenging task which has motivated different experimental approaches. Fragmentation testing was used in the present study as a means of in[...]
Article : texte imprimé
Nathalie Limodin, Auteur ;
Julien Réthoré, Auteur ;
Jean-Yves Buffière, Auteur
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Synchrotron X-ray tomography was performed during in situ fatigue crack propagation in two small-size specimens made of nodular graphite cast iron. While direct image analysis allows us to retrieve the successive positions of the crack front, an[...]
Article : texte imprimé
C.M. Fang, Auteur ;
M.A. van Huis, Auteur ;
M.H.F. Sluiter, Auteur
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First-principles’ calculations of GGA and GGA + U type have been performed for γ-Fe23C6, a complex iron carbide with 116 atom in the unit cell. GGA results were found to be in better agreement with experimental data than GGA + U results. Various[...]
Article : texte imprimé
H.A. Khater, Auteur ;
D. J. Bacon, Auteur
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Properties of basal and first order prism plane dislocations with Burgers vector 1/3 〈View the MathML source〉 in α-Zr have been investigated by computer simulation. Results for a recent interatomic potential (MA07) are assessed and compared with[...]
Article : texte imprimé
I. Ulacia, Auteur ;
N.V. Dudamell, Auteur ;
F. Gálvez, Auteur
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The mechanical behavior of an AZ31 Mg sheet has been investigated at high strain rate (103 s−1) and compared with that observed at low rates (10−3 s−1). Dynamic tests were carried out using a Hopkinson bar at temperatures between 25 and 400 °C. [...]
Article : texte imprimé
Atomic-scale imaging and the effect of yttrium on the fracture toughness of silicon carbide ceramics
A.M. Kueck, Auteur ;
Q.M. Ramasse, Auteur ;
L.C. De Jonghe, Auteur
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In SiC sintered with Al, B and C additions (ABC–SiC), the presence of Y in the Al–Si–O–C grain-boundary phase leads to less frequent crack deflection and lower toughness. When Y is absent from the grain-boundary phase and remains in the triple p[...]
Article : texte imprimé
Q.G. Wang, Auteur ;
M. Praud, Auteur ;
A. Needleman, Auteur
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A finding by Benzerga et al. (Acta Mater 2001; 49:3071) that the yield strength of Al–7Si–0.3Mg castings is smaller for castings with a fine secondary dendrite arm spacing (SDAS) than for those with a coarse SDAS is revisited. Previous experimen[...]
Article : texte imprimé
P. Parente, Auteur ;
Y. Ortega, Auteur ;
B. Savoini, Auteur
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Positron annihilation spectroscopy (PAS), indentation, nanoindentation experiments and scanning electron microscopy (SEM) observations were performed on Al2O3–ZrO2 laminates samples to assess the effect of residual stresses on their mechanical a[...]
Article : texte imprimé
A. Albou, Auteur ;
J.H. Driver, Auteur ;
C. Maurice, Auteur
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The deformation microstructures of Al and Al–Mn {1 1 0}〈1 1 2〉 single crystals have been characterized after room temperature channel-die compression up to true strains of 2.1. The evolution of local misorientations and microband structures were[...]
Article : texte imprimé
Daqin Chen, Auteur ;
Yunlong Yu, Auteur ;
Ping Huang, Auteur
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Eu3+-doped transparent nanocomposite of SiO2–Al2O3–NaF–LaF3 was fabricated by melt-quenching and subsequent heating. X-ray diffraction and transmission electron microscopy analyses evidenced that hexagonal LaF3 nanocrystals were homogeneously pr[...]
Article : texte imprimé
E. Tal-Gutelmacher, Auteur ;
R. Gemma, Auteur ;
A. Pundt, Auteur
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Nanocrystalline titanium films of different thicknesses, sputtered on sapphire substrates, were charged electrochemically with hydrogen. Hydrogen absorption and the thermodynamics of the nanocrystalline Ti–H thin film system were studied using e[...]
Article : texte imprimé
The size, surface and interface effects on the magnitude and stability of spontaneous polarization in a symmetric nanoscale ferroelectric capacitor were studied by analyzing its evolutionary trajectory based on a thermodynamic model. Analytic ex[...]
Article : texte imprimé
Z.F. Zhou, Auteur ;
Y. C. Zhou, Auteur ;
Y. Pan, Auteur
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The effects of wire diameter and grain size on the melting point of Ni nanowires with and without oxide capping were systematically examined. It was found that, for uncapped Ni nanowires, the melting point drops monotonically with grain size and[...]
Article : texte imprimé
Neng Wan, Auteur ;
Jun Xu, Auteur ;
Guran Chen, Auteur
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Small-sized indium tin oxide (ITO) nanowires were fabricated using the electron beam evaporation (EBE) technique at low temperature (∼150 °C) without adding any catalyst. The ITO nanowires have a typical diameter of around 10 nm and a length of [...]
Article : texte imprimé
F. Hajiakbari, Auteur ;
M. Nili-Ahmadabadi, Auteur ;
B. Poorganji, Auteur
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The martensite start temperature and driving force were calculated for the austenite to martensite transformation of a dual-phase bainitic ferrite–austenite steel at room temperature. The mechanical energy was estimated during the first and the [...]
Article : texte imprimé
Yaping Lü, Auteur ;
Bevis Hutchinson, Auteur ;
Dmitri A. Molodov, Auteur
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Microstructure and texture evolution during cold rolling and subsequent annealing were studied in an Fe–22 wt.% Mn–0.376 wt.% C alloy. During rolling the deformation mechanisms were found to be dislocation slip, mechanical twinning, deformation-[...]
Article : texte imprimé
P.M. Kelly, Auteur ;
H.-P. Ren, Auteur ;
D. Qiu, Auteur
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It is often necessary to identify close-packed or nearly close-packed planes in a crystal. This can be done by inspection in crystal structures where one atom occupies each lattice point – i.e. face-centred cubic and body-centred cubic crystals.[...]
Article : texte imprimé
T. Tsuru, Auteur ;
Y. Shibutani, Auteur ;
Y. Kaji, Auteur
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Nanoscale incipient plastic deformation in crystalline metals occurs as the result of the collective motion of dislocations. It is known as “nanoplasticity” and is recognized as the elementary process of the macroscopic deformation. Abrupt incre[...]
Article : texte imprimé
Microstructural evolution associated with the shear banding in nano-scale twin/matrix (T/M) lamellae of a Cu–Al alloy processed by means of dynamic plastic deformation was investigated using transmission electron microscopy (TEM) and high-resolu[...]
Article : texte imprimé
M. Černý, Auteur ;
J. Pokluda, Auteur
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The influence of a triaxial stress applied normally to shear planes and shear direction during affine shear deformation of face-centered cubic crystals on the theoretical shear strength is studied for the View the MathML source shear system usin[...]
Article : texte imprimé
D.J.S. Hyslop, Auteur ;
A. M. Abdelkader, Auteur
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Co–30 wt.% Cr alloy was prepared by electro-deoxidation in molten calcium chloride at 1123 K. A preliminary study was conducted into the preparation of the mixture of the Co3O4 and Cr2O3 and the formation of the non-stoichiometric, spinel struct[...]
Article : texte imprimé
R. C. Batra, Auteur ;
A.A. Pacheco, Auteur
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We use molecular statics simulations with the tight-binding potential to analyze stress evolution in nanosize square prismatic gold specimens of different aspect ratios (length/width) deformed in either simple tension/compression or tension/comp[...]
Article : texte imprimé
M. Danaie, Auteur ;
S.X. Tao, Auteur ;
P. Kalisvaart, Auteur
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Cryo-stage transmission electron microscopy (TEM), supported by Density Functional Theory (DFT), is employed to explore the microstructure of magnesium hydride (MgH2) powders. Mechanical milling results in deformation twinning of the hydride. Th[...]
Article : texte imprimé
Tae-Ho Lee, Auteur ;
Eunjoo Shin, Auteur ;
Chang-Seok Oh, Auteur
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The correlation between stacking fault energy (SFE) and deformation microstructure of high-interstitial-alloyed austenitic Fe–18Cr–10Mn–(N or N + C) alloys was investigated. As the content of the interstitial elements increased, the deformation [...]
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