 |
Vol. 58 N° 6 - Acta materialia Avril 2010 |
Vol. 58 N° 5 - Acta materialia Mars 2010 |
Vol. 58 N° 4 - Acta materialia Fevrier 2010 |
Vol. 59 N° 20 - Acta materialia Décembre 2011 |
Acta materialia, Vol. 59 N° 20. Acta materialia - Décembre 2011
| Titre : | Acta materialia, Vol. 59 N° 20. Acta materialia - Décembre 2011 |
| Type de document : | Bulletin |
| Paru le : | 16/09/2012 |
Dépouillements
Article : texte imprimé
J. Jeon, Auteur ;
S. Mironov, Auteur ;
Y.S. Sato, Auteur
|
The high-resolution electron backscatter diffraction technique was employed to study the structural response of single-crystal austenitic stainless steel to friction stir spot welding. The strain-induced crystal rotations were found to be govern[...]
Article : texte imprimé
The huge strains that Ni–Mn–Ga magnetic shape memory alloys can achieve are usually described in a tetragonal unit cell approximation of a five-layered modulated (10 M) crystal structure. Here we analyze the impact of a slight orthorhombic and m[...]
Article : texte imprimé
Julien Guénolé, Auteur ;
Sandrine Brochard, Auteur ;
Julien Godet, Auteur
|
We have performed molecular dynamics simulations and first-principles calculations to investigate the first stages of plasticity in single-crystalline silicon nanostructures free of initial defects, under compressive and tensile strain along the[...]
Article : texte imprimé
Zhi-Qiang Zou, Auteur ;
Wei-Cong Li, Auteur ;
Jia-Miao Liang, Auteur
|
Higher manganese silicide nanowires (NWs) with a large aspect ratio have been grown on three kinds of substrate, Si(1 1 1), (1 1 0) and (0 0 1), with the reactive epitaxy method at temperatures above ∼500 °C. The self-assembly of the NWs is conf[...]
Article : texte imprimé
Yu.V. Milman, Auteur ;
А.А. Golubenko, Auteur ;
S.N. Dub, Auteur
|
It was shown experimentally that changing the indenter load P and the indentation size does not change the total deformation during indentation (εt ≈ const.), and that fracture does not influence the scale effect. For this reason the physical na[...]
Article : texte imprimé
E. Detsi, Auteur ;
E. De Jong, Auteur ;
A. Zinchenko, Auteur
|
A proper quantification of the specific surface area of nanoporous materials is necessary for a better understanding of the properties that are affected by the high surface-area-to-volume ratio of nanoporous metals, nanoporous polymers and nanop[...]
Article : texte imprimé
G. Bakradze, Auteur ;
L.P.H. Jeurgens, Auteur ;
T. Acartürk, Auteur
|
Two-stage oxidation experiments using 16O and 18O isotopes were performed to reveal the governing atomic transport mechanism(s) in thin (thickness
Article : texte imprimé
M.K. Khan, Auteur ;
M.E. Fitzpatrick, Auteur ;
S.V. Hainsworth, Auteur
|
Residual stresses and plastic deformation around scratches or scribe marks in ductile materials can affect fatigue life. Scratches of the order of tens of microns may convert into propagating cracks driven by tensile residual stresses at the scr[...]
Article : texte imprimé
X. Noirfalise, Auteur ;
T. Godfroid, Auteur ;
G. Guisbiers, Auteur
|
ZnO and fluorine doped ZnO (FZO) thin films were prepared by d.c. reactive magnetron sputtering using a zinc target in an Ar/O2(/F2) mixture. In a first attempt ZnO films were synthesized in order to optimize the matrix properties in terms of cr[...]
Article : texte imprimé
Karl R. Whittle, Auteur ;
Mark G. Blackford, Auteur ;
Robert D. Aughterson, Auteur
|
Pyrochlores based on the general composition Ln2TiO5 (Ln2.67Ti1.33O6.67) and Ln2Ti2O7, where Ln = Y or Yb, have been irradiated through the crystalline–amorphous transition with 1 MeV Kr ions at the IVEM-TANDEM facility, Argonne National Laborat[...]
Article : texte imprimé
B.B. Rath, Auteur ;
C. S. Pande, Auteur
|
Experimental studies of recrystallization in deformed single crystals of pure iron are described. The results are used to analyze various parameters associated with the time evolution of the volume fraction of the growing phase during phase tran[...]
Article : texte imprimé
Seawoong Lee, Auteur ;
Seok-Jae Lee, Auteur ;
Bruno C. De Cooman, Auteur
|
Ultrafine grain refinement by intercritical annealing at 680 °C and 640 °C was investigated in a Fe–0.05%C–6.15%Mn–1.4%Si multiphase TRIP steel. A large volume fraction of retained austenite was obtained at room temperature in both cases. Wherea[...]
Article : texte imprimé
Hidetoshi Somekawa, Auteur ;
Christopher A. Schuh, Auteur
|
The effect of solid solution alloying elements on the plastic deformation of fine grained Mg alloys was studied in five binary systems: Mg–0.3 at.% X (X = Al, Ca, Li, Y or Zn). All the alloys were produced by extrusion and had an average grain s[...]
Article : texte imprimé
C. Landron, Auteur ;
E. Maire, Auteur ;
O. Bouaziz, Auteur
|
In situ tensile tests were carried out during X-ray microtomography imaging of three steels: a single phase ferritic steel, a dual phase steel and a fully martensitic steel. Cavity growth was first quantified in the different samples as a functi[...]
Article : texte imprimé
H. Jabbar, Auteur ;
J.-P. Monchoux, Auteur ;
M. Thomas, Auteur
|
TiAl alloys are prepared by spark plasma sintering (SPS) using a pre-alloyed powder with the so-called G4 composition (Ti51Al47Re1W1Si0.2). SPS densifications are conducted using short and classical cycles, with various dwell temperatures.
The [...]
Article : texte imprimé
S. Akamatsu, Auteur ;
S. Bottin-Rousseau, Auteur ;
G. Faivre, Auteur
|
We present a real-time observation study of lamellar patterns in thin-sample directional solidification of a near-eutectic In–In2Bi metallic alloy. The spacing range of stability is shown to extend from about 0.9λJH to 2.2λJH, where λJH is the J[...]
Article : texte imprimé
J. Suffner, Auteur ;
T. Scherer, Auteur ;
D. Wang, Auteur
|
Metastable alumina composite powders with 13 wt.% titania were produced by plasma spraying using liquid nitrogen quenched substrates. The material consisted of a mixture of Al2O3 in a distorted spinel structure and a large amount of amorphous ph[...]
Article : texte imprimé
Yahya Motemani, Auteur ;
Patrick J. McCluskey, Auteur ;
Chunwang Zhao, Auteur
|
The martensitic transformation in Ti–Ni–Hf thin films with ultra-fine grain structure has been analyzed as a function of composition using a high-throughput array of nanocalorimeters. The martensite–austenite transformation temperature is signif[...]
Article : texte imprimé
Marsha E. Van Dalen, Auteur ;
Thomas Gyger, Auteur ;
David C. Dunand, Auteur
|
It is known that Zr and Yb partition to the Al3Sc precipitates created during aging when microalloyed separately in dilute binary Al–Sc alloys. Addition of Zr delays precipitate coarsening, thereby improving the coarsening resistance of the tern[...]
Article : texte imprimé
Indentation experiments were performed on as-cast and elastically-bent-and-constrained Zr-based metallic glass samples to investigate the effect of strain rate and residual stresses on the onset of yielding in the material. The critical shear st[...]
Article : texte imprimé
Christian M. Ulrich, Auteur ;
Adham Hashibon, Auteur ;
Jiřı´ Svoboda, Auteur
|
A common joining method in microelectronics is thermosonic bonding of gold wires to aluminium pads deposited on the integrated circuit. In the interface between the wire and the pad a number of intermetallic compounds AlxAuy can develop, which s[...]
Article : texte imprimé
Kedarnath Kolluri, Auteur ;
Michael J. Demkowicz, Auteur
|
Using atomistic modeling, we show that restructuring of the network of interconnected ligaments causes coarsening in a model of nanoporous gold. The restructuring arises from the collapse of some ligaments onto neighboring ones and is enabled by[...]
Article : texte imprimé
S. Gallops, Auteur ;
T. Fett, Auteur ;
J. W. Ager III, Auteur
|
Small crack fatigue is a widely recognized problem in the fatigue of materials; however, there has been limited progress in developing methods to predict small crack fatigue behavior. In this paper small crack effects due to crack bridging are a[...]
Article : texte imprimé
T. Homma, Auteur ;
S. Nakawaki, Auteur ;
K. Oh-ishi, Auteur
|
The addition of 0.3% Mn to a Mg–2Al–2Ca (mass%) alloy improves the minimum creep rate by one order of magnitude compared with the Mn-free alloy. Network-shaped Mg2Ca (C14 structure) and (Mg,Al)2Ca (C36 structure) compounds coexist in the interde[...]
Article : texte imprimé
Caizhi Zhou, Auteur ;
Irene J. Beyerlein, Auteur ;
Richard LeSar, Auteur
|
Three-dimensional (3-D) dislocation dynamics simulations were employed to examine the fundamental mechanisms of plasticity in small-scale face-centered cubic single crystals. Guided by the simulation results, we examined two distinct modes of be[...]
Article : texte imprimé
G. Purcek, Auteur ;
O. Saray, Auteur ;
F. Rubitschek, Auteur
|
The influence of surface modification by internal oxidation on dry sliding wear behavior of ultrafine-grained (UFG) Nb–Zr was investigated using a pin-on-disc type tribometer. The results show that improvement in strength by grain refinement via[...]
Article : texte imprimé
P. Shanthraj, Auteur ;
M.A. Zikry, Auteur
|
Dislocation density-based evolution formulations that are related to a heterogeneous microstructure and are physically representative of different crystalline interactions have been developed. The balance between the generation and annihilation [...]
Article : texte imprimé
B. Ryningen, Auteur ;
G. Stokkan, Auteur ;
M. Kivambe, Auteur
|
Highly detrimental dislocation clusters are frequently observed in lab-scale as well as industrially produced multicrystalline silicon ingots for solar cell applications. This paper presents an investigation of dislocation clusters and how they [...]
Article : texte imprimé
D. Geissler, Auteur ;
J. Freudenberger, Auteur ;
A. Kauffmann, Auteur
|
By comparing the microstructural and texture evolution with tensile stress–strain response of an Fe–24Mn–7Ni–8Cr (mass%) alloy, a slip-dominated deformation process and, at a later stage of deformation, twinning-induced plasticity are observed. [...]
Article : texte imprimé
N.A. Heinz, Auteur ;
T. Ikeda, Auteur ;
G.J. Snyder, Auteur
|
Understanding the structure and formation mechanisms of interfaces between different telluride phases is important to the development of thermoelectric nanocomposites. Here, we investigate the interfacial structure of tetradymite precipitates in[...]
Article : texte imprimé
Wilhelm G. Wolfer, Auteur
|
Lattice parameter changes in nanoparticles can be used to determine the surface stress of solids. In the past a Laplace–Young relationship has been employed to interpret the lattice parameter changes as a function of the particle size. In the me[...]
Article : texte imprimé
M.J. Demkowicz, Auteur ;
L. Thilly, Auteur
|
Atomistic modeling is used to investigate the shear resistance and interaction with point defects of a Cu–Nb interface found in nanocomposites synthesized by severe plastic deformation. The shear resistance of this interface is highly anisotropi[...]
Article : texte imprimé
W. Engelhart, Auteur ;
W. Dreher, Auteur ;
O. Eibl, Auteur
|
Alumina thin films were deposited by reactive dual magnetron sputtering at 550 °C on cemented carbide substrates. A Young’s modulus of 315 GPa and a Vickers hardness of 2348 were determined by nanoindentation and were compared to reference mater[...]
Article : texte imprimé
W. B. Cui, Auteur ;
Y.K. Takahashi, Auteur ;
K. Hono, Auteur
|
A high coercivity of 2.35 MA m−1 (29.5 kOe) is demonstrated using perpendicular anisotropy Nd–Fe–B films. Single layer columnar grown Nd–Fe–B thin films with a coercivity comparable with that of sintered magnets (1.11 MA m−1, 14.0 kOe) were used[...]
Article : texte imprimé
Wanqiang Xu, Auteur ;
Rongkun Zheng, Auteur ;
Kevin J. Laws, Auteur
|
In situ bulk metallic glass (BMG) composites generally contain a crystalline phase(s) that forms throughout the amorphous matrix during cooling from the melt. The presence of the crystalline phase in these materials is known to improve both duct[...]
Article : texte imprimé
H. Beladi, Auteur ;
I.B. Timokhina, Auteur ;
Y. Estrin, Auteur
|
The twinning induced plasticity steel 0.6 C–18 Mn–1.5 Al (wt.%) employed in this study exhibited a strength of about 1 GPa, combined with a large uniform elongation of over 60% at moderate strain rates. This excellent combination of tensile mech[...]
Article : texte imprimé
Tae Wook Heo, Auteur ;
Saswata Bhattacharyya, Auteur ;
Long-Qing Chen, Auteur
|
We have studied strain-induced solute segregation at a grain boundary and the solute drag effect on boundary migration using a phase field model integrating grain boundary segregation and grain structure evolution. The elastic strain energy of a[...]
Article : texte imprimé
A. Kauffmann, Auteur ;
J. Freudenberger, Auteur ;
D. Geissler, Auteur
|
The effect of low-temperature on the active deformation mechanism is studied in pure copper. For this purpose, cryogenic wire drawing at liquid nitrogen temperature (77 K) was performed using molybdenum disulfide lubrication. Microstructural inv[...]
Article : texte imprimé
Alireza Ghaderi, Auteur ;
Matthew R. Barnett, Auteur
|
The impact of grain size on deformation twinning in commercial purity titanium and magnesium alloy Mg–3Al–1Zn (AZ31) is investigated. Tensile tests were carried out for the titanium samples; compression testing was employed for the magnesium spe[...]
Article : texte imprimé
D.B. Miracle, Auteur ;
G.B. Wilks, Auteur ;
A.G. Dahlman, Auteur
|
The strengths of chemical bonds between atoms are accurately measured and widely available for molecular gases, but an established method of quantifying bond strengths in liquids and solids is not available, and the strengths of these bonds are [...]
Exemplaires(0)
| Disponibilité | ||||
|---|---|---|---|---|
| aucun exemplaire | ||||
