Acta materialia, Vol. 58 N° 9. Acta materialia - Mai 2010
| Titre : | Acta materialia, Vol. 58 N° 9. Acta materialia - Mai 2010 |
| Type de document : | Bulletin |
| Paru le : | 12/12/2011 |
Dépouillements
Article : texte imprimé
Jens Görlich, Auteur ;
Dietmar Baither, Auteur ;
Guido Schmitz, Auteur
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Soldering between solid Ni and liquid Sn is studied, including late stages of reflow. Only during the very early stages of the process, intermetallic grains grow with a 1/3 power dependence on time. Later, kinetics clearly changes to parabolic g[...]
Article : texte imprimé
P.W.J. Mckenzie, Auteur ;
R. Lapovok, Auteur
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The microstructure evolution of aluminium alloy 6016 processed by equal channel angular pressing (ECAP) was investigated for different processing parameters. A number of heat treatments, including F, W, O, T4, T6 and T7, were evaluated for worka[...]
Article : texte imprimé
P.W.J. Mckenzie, Auteur ;
R. Lapovok, Auteur
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The simultaneous increase in strength and ductility of aluminium alloy 6016 processed by equal channel angular pressing (ECAP) was investigated. A complete study of microstructure, texture and mechanical properties after ECAP processing with and[...]
Article : texte imprimé
G. Stokkan, Auteur
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Dislocation density and crystal orientation were investigated for a set of multicrystalline silicon ingots grown in a pilot scale furnace. Both low and high dislocation density ingots were observed. The low dislocation density ingots showed a do[...]
Article : texte imprimé
S.Y. Hu, Auteur ;
C.H. Henager Jr., Auteur
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A phase-field model simulating vacancy diffusion in a solid with a strong vacancy mobility inhomogeneity is presented. The model is used to study void migration via bulk and surface diffusion in a temperature gradient. The simulations demonstrat[...]
Article : texte imprimé
C. Gatel, Auteur ;
H. Tang, Auteur ;
C. Crestou, Auteur
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Elastic strain has been investigated by transmission electron microscopy in nanometric InAs layers grown on Ga0.47In0.53As/InP(0 0 1) by molecular beam epitaxy using a residual Sb flux. Deposits of 10 and 15 monolayers of InAs (3 and 4.5 nm) rem[...]
Article : texte imprimé
Somjeet Biswas, Auteur ;
Satyam Suwas, Auteur
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In this paper, we demonstrate a way to impart severe plastic deformation to magnesium at room temperature to produce ultrafine grain size of ∼250 nm through equal channel angular extrusion (ECAE). The strategy to deform magnesium at lower temper[...]
Article : texte imprimé
An analytical model for constitutional supercooling-driven grain formation and grain size prediction
M. Qian, Auteur ;
P. Cao, Auteur ;
M.A. Easton, Auteur
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Being able to predict the grain formation process and attendant grain size has been a central topic in solidification. Such an analytical model is presented for constitutional supercooling (CS)-driven grain formation with several simplifications[...]
Article : texte imprimé
J.W. Morris Jr., Auteur ;
Y. Hanlumyuang, Auteur ;
M. Sherburne, Auteur
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Tensile tests on single crystals of Gum Metal (Ti–36Nb–2Ta–3Zr–0.3O (wt.%)) showed, anomalously, that while a stress-induced β(bcc) → α″(orthorhombic) transformation occurred in a crystal pulled in the 〈1 1 0〉 direction, (1) no transformation wa[...]
Article : texte imprimé
This work reveals the formation mechanisms of saturation dislocation patterns in three typical multiple-slip oriented [0 0 1], [0 1 1] and View the MathML source copper single crystals. Compared with the single-slip oriented copper single crysta[...]
Article : texte imprimé
T. Jourdan, Auteur ;
J.-L. Bocquet, Auteur ;
F. Soisson, Auteur
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A precipitation model for an event-based kinetic Monte Carlo (EKMC) method is presented. It is based on atomic-scale computations of the emission and absorption rates of monomers by clusters. Clusters are considered as single objects that emit m[...]
Article : texte imprimé
Lore Thijs, Auteur ;
Frederik Verhaeghe, Auteur ;
Tom Craeghs, Auteur
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Selective laser melting (SLM) is an additive manufacturing technique in which functional, complex parts can be created directly by selectively melting layers of powder. This process is characterized by highly localized high heat inputs during ve[...]
Article : texte imprimé
C. Mareau, Auteur ;
M.R. Daymond, Auteur
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In the present paper, an elasto-viscoplastic model is proposed to describe the behavior of hexagonal close-packed materials where multiple deformation modes, including plastic slip and twinning, coexist. The model assists in interpreting the exp[...]
Article : texte imprimé
V.Yu. Novikov, Auteur
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The ability of second phase particles to migrate along with grain boundaries is shown to be determined not only by the particle mobility but also by the migration rate of the grain boundary where they locate. This leads to a duality in the mobil[...]
Article : texte imprimé
Muliana, Anastasia H., Auteur
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This study presents a simplified micromechanical model to predict electromechanical behaviors of piezocomposites, having ferroelectric fibers and polymer matrix. A nonlinear electromechanical constitutive model is formulated for the ferroelectri[...]
Article : texte imprimé
Shanmugam Nagendiran, Auteur ;
Muthukaruppan Alagar, Auteur ;
Ian Hamerton, Auteur
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Epoxy resin nanocomposites, based on the diglycidyl ether of bisphenol-A (DGEBA) and tetraglycidyl diamino diphenyl methane (TGDDM), are prepared via in situ co-polymerization with 4,4′-diaminodiphenylsulfone (DDS) in the presence of octa-aminop[...]
Article : texte imprimé
In situ electron backscattering diffraction (EBSD) investigations were conducted on polycrystalline NiTi tube specimens during tensile and compressive deformation. The long-range cooperative and catalytic martensitic transformation under tension[...]
Article : texte imprimé
Oussama Yousfi, Auteur ;
Patricia Donnadieu, Auteur ;
Bréchet, Yves, Auteur
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Nickel sulphide inclusions are known to be responsible for delayed fracture in tempered glasses due to phase transformation within the inclusion. Microstructural identification of the phase transformation mechanisms in the Ni–S system close to t[...]
Article : texte imprimé
U. Bösenberg, Auteur ;
J.W. Kim, Auteur ;
D. Gosslar, Auteur
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The influence of additives on the reaction kinetics and microstructure refinement in LiBH4–MgH2 composites is investigated in detail. Indications of the rate-limiting processes during the reactions are obtained by comparison of the measured reac[...]
Article : texte imprimé
Guillaume Bernard-Granger, Auteur ;
Ahmed Addad, Auteur ;
Gilbert Fantozzi, Auteur
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A commercially available granulated TZ3Y powder has been sintered by hot-pressing (HP). The “grain size/relative density” relationship, referred to here as the “sintering path”, has been established for a constant value of the heating rate (25 °[...]
Article : texte imprimé
T. Jourdan, Auteur ;
F. Soisson, Auteur ;
E. Clouet, Auteur
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A cluster dynamics model has been parametrized to quantitatively reproduce results obtained by atomistic kinetic Monte Carlo (AKMC) modeling on the precipitation of Cu in α-Fe under thermal aging. The cluster mobility, highlighted by AKMC, is sh[...]
Article : texte imprimé
I. Kaban, Auteur ;
S. Curiotto, Auteur ;
D. Chatain, Auteur
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Surface and bulk liquid phase transitions are measured by a unique method currently used to determine surface and interfacial tension of liquid alloys. Focusing on the Al–In system, the location of the liquid miscibility gap was determined from [...]
Article : texte imprimé
Anja Backen, Auteur ;
Srinivasa R. Yeduru, Auteur ;
Manfred Kohl, Auteur
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In order to use the magnetic shape memory alloy Ni–Mn–Ga with its high achievable strain of up to 10% for microactuators, freestanding epitaxial films are required. Here we show that these conditions can be fulfilled when using chromium as a sac[...]
Article : texte imprimé
Alireza Hekmat-Ardakan, Auteur ;
Frank Ajersch, Auteur
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This paper presents the thermodynamic evaluation of A390 hypereutectic Al–Si alloy (Al–17% Si–4.5% Cu–0.5% Mg) and alloys up to 10% Mg, using the Factsage® software. Two critical compositions were detected at 4.2% and 7.2% Mg where the temperatu[...]
Article : texte imprimé
J.F. Li, Auteur ;
P. A. Agyakwa, Auteur ;
C.M. Johnson, Auteur
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The kinetics of the interfacial reaction of a thin layer of Sn sandwiched between two pieces of Ag foil has been investigated at temperatures of 260 °C, 300 °C and 340 °C. A time dependence of the form t1/n with n = 3 was obtained for the kineti[...]
Article : texte imprimé
J. Frenzel, Auteur ;
E.P. George, Auteur ;
A. Dlouhy, Auteur
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High-precision data on phase transformation temperatures in NiTi, including numerical expressions for the effect of Ni on MS, MF, AS, AF and T0, are obtained, and the reasons for the large experimental scatter observed in previous studies are di[...]
Article : texte imprimé
J. Repper, Auteur ;
T. Keller, Auteur ;
M. Hofmann, Auteur
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Neutron Larmor diffraction (LD) is a high-resolution diffraction technique based on the Larmor precession of polarized neutrons. In contrast to conventional diffraction, LD does not depend on the accurate measurement of Bragg angles, and thus th[...]
Article : texte imprimé
R. Caballero, Auteur ;
V. Izquierdo-Roca, Auteur ;
X. Fontané, Auteur
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The objective of this work is to study the influence of the maximum Cu content during the deposition of Cu(In,Ga)Se2 (CIGSe) by multi-stage co-evaporation on the phases present in the final film, the film structure and the electrical properties [...]
Article : texte imprimé
A. Shibata, Auteur ;
T. Furuhara, Auteur ;
T. Maki, Auteur
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This study investigates the interphase boundary structures of lenticular martensites in Fe–33Ni and Fe–31Ni, and discusses the accommodation mechanism for transformation strain. Despite the large difference in the macroscopic morphology of the i[...]
Article : texte imprimé
D. Caillard, Auteur
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In situ straining experiments have been carried out in pure Fe, in order to determine the geometry and the kinetics of dislocation glide at room temperature. Straight screw dislocations glide slowly in {1 1 0} elemental slip planes, at a velocit[...]
Article : texte imprimé
D. Caillard, Auteur
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In situ straining experiments have been carried out at low temperature in pure Fe, in order to study the change of mechanism occurring at around 250 K. The local stress necessary to move individual screw dislocations is in good agreement with th[...]
Article : texte imprimé
C. Zambaldi, Auteur ;
D. Raabe, Auteur
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Single crystals of γ-TiAl cannot be grown in the near-stoichiometric compositions that are present inside two-phase γ/α2-microstructures with attractive mechanical properties. Therefore, the single-crystal constitutive behavior of γ-TiAl was stu[...]
Article : texte imprimé
Hossein Beladi, Auteur ;
Pavel Cizek, Auteur ;
Peter D. Hodgson, Auteur
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Substructure development in an austenitic Ni–30%Fe model alloy was investigated within a dynamic recrystallization (DRX) regime. The substructure characteristics of the deformed matrix and DRX grains were markedly different regardless of the gra[...]
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