Acta materialia, Vol. 58 N° 4. Acta materialia - Fevrier 2010
| Titre : | Acta materialia, Vol. 58 N° 4. Acta materialia - Fevrier 2010 |
| Type de document : | Bulletin |
| Paru le : | 12/12/2011 |
Dépouillements
Article : texte imprimé
Atomic-level modeling of materials provides fundamental insights into phase stability, structure and properties of crystalline defects, and to physical mechanisms of many processes ranging from atomic diffusion to interface migration. This knowl[...]
Article : texte imprimé
F. Roters, Auteur ;
P. Eisenlohr, Auteur ;
L. Hantcherli, Auteur
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This article reviews continuum-based variational formulations for describing the elastic–plastic deformation of anisotropic heterogeneous crystalline matter. These approaches, commonly referred to as crystal plasticity finite-element models, are[...]
Article : texte imprimé
Yunzhi Wang, Auteur ;
Ju Li, Auteur
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New perspectives on the phase field approach in modeling deformation and fracture at the fundamental defect level are reviewed. When applied at sub-angstrom length scales the phase field crystal (PFC) model is able to describe thermally averaged[...]
Article : texte imprimé
Xuan Zheng, Auteur ;
David G. Cahill, Auteur ;
Ji-Cheng Zhao, Auteur
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The effect of low-dose MeV ion irradiation on the thermal conductivity and coefficient of thermal expansion (CTE) of Fe–Ni alloys has been studied over the entire composition range using a combinatorial method. With our experimental precision of[...]
Article : texte imprimé
E. P. Busso, Auteur ;
H. E. Evans, Auteur ;
Z.Q. Qian, Auteur
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It is known that fast-growing non-alumina scales in thermal barrier coating (TBC) systems tend to form at features where aluminium depletion is enhanced due to a high surface-area to volume ratio, a phenomenon known as breakaway oxidation. In th[...]
Article : texte imprimé
O. Kozlova, Auteur ;
M. Braccini, Auteur ;
R. Voytovych, Auteur
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The purpose of this work was to describe and discuss the fundamental issues involved in reactive brazing of alumina to copper by CuAgTi alloys. The method used to bring the Ti to the CuAg braze enabled the Ti concentration in the braze to be var[...]
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H. Leitner, Auteur ;
M. Schober, Auteur ;
R. Schnitzer, Auteur
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The evolution of precipitation and mechanical properties of an Fe–Ni–Al–Ti–Cr stainless steel was studied during ageing at 525 °C. Atom probe tomography and transmission electron microscopy were applied to follow the microstructural evolution. A[...]
Article : texte imprimé
Chung-Hsiang Chang, Auteur ;
Yi-Hao Pai, Auteur ;
Jr-Hau He, Auteur
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Strong blue photoluminescence (PL) spectra from Si nanocrystals (Si-ncs) embedded in Si-rich SiOx grown by PECVD at ultra-low N2O flow density and N2O/SiH4 flow ratios are characterized. The N2O flow density is kept as low as 25 sccm to restrict[...]
Article : texte imprimé
Bulk Zr64.13Cu15.75Ni10.12Al10 metallic glass has been rolled at room temperature in two different directions, and the dependences of microstructure and tensile mechanical property on the degree of deformation and rolling directions have been in[...]
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V. D. Blank, Auteur ;
B.A. Kulnitskiy, Auteur ;
I.A. Perezhogin, Auteur
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Cobalt-filled carbon nanotubes were synthesized at high temperature and high gas pressure. A high-resolution transmission electron microscopy study demonstrates that the product of the synthesis contains cylindrical carbon nanotubes whose cores [...]
Article : texte imprimé
Mangmang Gao, Auteur ;
Hongli Suo, Auteur ;
Yue Zhao, Auteur
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Thin, biaxially textured Ni5W/Ni12W/Ni5W composite substrates for coated conductor applications have been fabricated. The particularity of this three-layer composite configuration resides in the elemental diffusion between the outer layer and th[...]
Article : texte imprimé
H. Sepehri-Amin, Auteur ;
W.F. Li, Auteur ;
T. Ohkubo, Auteur
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Microstructural evolution of hydrogenation–disproportionation–desorption–recombination processed Nd12.5Fe72.8Co8.0B6.5Ga0.2 powder has been investigated in relation to coercivity development during the desorption recombination process. Coercivit[...]
Article : texte imprimé
Saiyi Li, Auteur ;
Fengwei Sun, Auteur ;
Hao Li, Auteur
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The texture evolution in commercial-purity aluminum (AA1070) processed by accumulative roll-bonding (ARB) is investigated with the aid of X-ray diffraction and crystal plasticity modeling. The experimental results indicate strong texture gradien[...]
Article : texte imprimé
D.M. Turriff, Auteur ;
S.F. Corbin, Auteur ;
M. Kozdras, Auteur
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Differential scanning calorimetry (DSC) was used to investigate clad/core interactions and the evolving microstructure during simulated brazing of aluminum brazing sheet alloy No. 12, which consists of an AA3003 core with AA4343 cladding layers [...]
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H. Ait-Amokhtar, Auteur ;
C. Fressengeas, Auteur
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The Portevin–Le Chatelier (PLC) effect in an Al–3.2%Mg alloy is investigated using velocity-driven tensile tests at room temperature, in a strain rate range where the crossover from continuous (type A bands) to discontinuous propagation (type B [...]
Article : texte imprimé
Andreas J. Klinter, Auteur ;
Carlos A. Leon-Patiño, Auteur ;
Robin A.L. Drew, Auteur
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Using a modified dispensed drop method, a decrease in contact angle on sapphire from pure aluminum to low-copper-containing Al alloys (7–12 wt.%) was found; with higher copper additions θ transitions to the non-wetting regime. Atomic force micro[...]
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Gyuhyon Lee, Auteur ;
Ju-Young Kim, Auteur ;
Arief Suriadi Budiman, Auteur
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Solid and hollow cylindrical indium pillars with nanoscale diameters were prepared using electron beam lithography followed by the electroplating fabrication method. The microstructure of the solid-core indium pillars was characterized by scanni[...]
Article : texte imprimé
Di Zhang, Auteur ;
Hidenori Terasaki, Auteur ;
Yu-ichi Komizo, Auteur
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Intragranular acicular ferrite is regarded as a most desirable microstructure feature, in view of its strength and toughness, both in weld metals and in the heat-affected zone. This paper systematically investigated the effect of Ti addition on [...]
Article : texte imprimé
Cheng Xu, Auteur ;
Steven Schroeder, Auteur ;
Patrick B. Berbon, Auteur
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Equal-channel angular pressing (ECAP) combined with the Conform process provides a solution for the continuous production of ultrafine-grained materials. Rods of a commercial Al-6061 alloy were processed by ECAP–Conform at room temperature for u[...]
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Stefan Wagner, Auteur ;
Astrid Pundt, Auteur
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During hydrogen gas loading, Pd thin films exhibit an anomalous reduction of resistivity change with decreasing film thickness. In this paper we show that this effect can mainly be attributed to a stress-dependent reduction of hydrogen solubilit[...]
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Cyril Cayron, Auteur ;
Françoise Barcelo, Auteur ;
Yann De Carlan, Auteur
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Face-centered cubic (fcc) to body-centered cubic (bcc) martensitic transformations occur in many materials, such as steels, FeNi meteorites or brass. The phenomenological theory has been the accepted theory for these transformations for more tha[...]
Article : texte imprimé
Xi Li, Auteur ;
Zhongming Ren, Auteur ;
Yves Fautrelle, Auteur
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The effects of a strong magnetic field on Al–Al2Cu and Pb–Sn lamellar eutectics during directional solidification have been investigated experimentally. The results show that the application of a strong magnetic field caused “tilting and oscilla[...]
Article : texte imprimé
B. Kedjar, Auteur ;
L. Thilly, Auteur ;
J.-L. Demenet, Auteur
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Indium antimonide (InSb) single crystals have been plastically deformed between −176 and 400 °C, i.e. below and above the brittle-to-ductile transition temperature situated around 150–160 °C, via the use of microindentation below room temperatur[...]
Article : texte imprimé
B. Kedjar, Auteur ;
L. Thilly, Auteur ;
J.-L. Demenet, Auteur
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Indium antimonide (InSb) has been plastically deformed over a wide temperature range, from 400 down to −176 °C (see the companion paper: Kedjar B, Thilly L, Demenet JL, Rabier J. Acta Mater 2009) and transmission electron microscopy was used to [...]
Article : texte imprimé
T. D. Anderson, Auteur ;
J.N. DuPont, Auteur ;
T. DebRoy, Auteur
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Stray grain formation in laser and electron beam welds on single-crystal alloy CMSX-4 was investigated through heat transfer and fluid flow simulations. The results were combined with a single-crystal growth model and stray grain calculations to[...]
Article : texte imprimé
H. Yin, Auteur ;
S.D. Felicelli, Auteur
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A two-dimensional model combining the finite element method and the cellular automaton technique was developed to simulate dendritic growth occurring in the molten pool during the laser-engineered net shaping (LENS) process. Based on the simulat[...]
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