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Showing papers in "Acta Materialia in 2010"


Journal ArticleDOI
TL;DR: In this article, the development of the microstructure of the Ti-6Al-4V alloy processed by selective laser melting (SLM) was studied by light optical microscopy.

2,201 citations


Journal ArticleDOI
TL;DR: In this paper, a review of continuum-based variational formulations for describing the elastic-plastic deformation of anisotropic heterogeneous crystalline matter is presented and compared with experiments.

1,573 citations


Journal ArticleDOI
TL;DR: In this paper, the activation of specific twin variants depending on the strain path induced a significant difference in twinning characteristics, such as twin morphology, volume fraction of twins with strain, and twin texture, and consequently gave rise to a totally different effect on the deformation.

651 citations


Journal ArticleDOI
TL;DR: In this paper, three experimental high manganese twinning induced plasticity (TWIP) steels were produced based on thermodynamic stacking fault energy (SFE) calculations, following the thermodynamic modeling approach originally proposed by Olson and Cohen (Metall Trans 7A (1976) 1897).

596 citations


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effects of deformation twinning on various aspects of plastic deformation, including the anisotropic strain-hardening rates, the tension/compression yield asymmetry, and the evolution of crystallographic texture.

565 citations


Journal ArticleDOI
TL;DR: In this paper, the deformation behavior and corresponding microstructure evolution of a Mg97Zn1Y2 (at.%) alloy with a long period stacking ordered (LPSO) structure subjected to hot compression were investigated.

552 citations


Journal ArticleDOI
TL;DR: In this paper, the 18R and 14H long-period stacking ordered structures formed in Mg-Y-Zn alloys were examined systematically using electron diffraction and high-angle annular dark-field scanning transmission electron microscopy.

526 citations


Journal ArticleDOI
TL;DR: In this article, the microstructure and mechanical properties of Mg97Zn1Y2 extruded alloy, composed of a Mg matrix phase and a long-period stacking ordered phase, were investigated using compression tests at room temperature.

502 citations


Journal ArticleDOI
TL;DR: In this article, the detwinning process is accomplished via the collective glide of multiple twinning dislocations that form an ITB, and detwinning can easily occur for thin twins, and the driving force is mainly attributed to a variation of the excess energy of a coherent twin boundary.

461 citations


Journal ArticleDOI
TL;DR: An overview of the most recent developments in the area of atomistic modeling with emphasis on interfaces and their impact on microstructure and properties of materials is given in this paper, along with some challenges and future research directions in this field.

455 citations


Journal ArticleDOI
TL;DR: The residual microindentation (Vickers) hardness (HV) averaged 4.1 GPa, corresponding to a nominal yield strength of ∼1.4 GPa (∼HV/3), and a specific yield strength (specific yield strength) of 0.37 GPa cm3 g−1 (for a density of 3.76 g cm−3), in contrast to 0.27 GPa kg−1 for EBM-fabricated Ti−6Al−4V components.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effect of precipitation strengthening in binary Al 0.1Sc, Al −0.1Zr and ternary Al−0. 1Zr alloys aged isochronally between 200 and 600°C.

Journal ArticleDOI
TL;DR: In this paper, the authors reviewed new perspectives on the phase field approach in modeling deformation and fracture at the fundamental defect level, including the ability to predict fundamental properties of individual defects such as size, formation energy, saddle point configuration and activation energy of defect nuclei, and the micromechanisms of their mutual interactions.

Journal ArticleDOI
TL;DR: In this article, the micro-structural evolution and grain refinement in ANSI 304 stainless steel subjected to multiple laser shock processing (LSP) impacts were investigated by means of cross-sectional optical microscopy and transmission electron microscopy observations.

Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the extended defects related to the twinning occurrence using transmission electron microscopy and found that high densities of sessile Frank dislocations are observed within the twins at the early stage of deformation, which can affect the growth and the stability of the twins, but also the strength of these twins and their interactions with the gliding dislocation present in the matrix.

Journal ArticleDOI
TL;DR: In this paper, the intrinsic complexities of the experimental examination of hydrogen embrittlement are discussed and an experimental approach, in situ electrochemical nanoindentation, is proposed and performed on different materials.

Journal ArticleDOI
TL;DR: In this article, a mesoscale model for solute strengthening of Mg is presented, which is validated with available experimental data for several solutes, including Al and Zn, the two most common solutes in Mg.

Journal ArticleDOI
TL;DR: In this article, the composition of precipitates in three alloys of the Al-Zn-Mg-Cu system has been investigated for different heat treatments, including peak-aged and over-aged states as well as near-equilibrium conditions, by combining atom probe tomography and systematic anomalous small-angle X-ray scattering experiments.

Journal ArticleDOI
TL;DR: In this paper, 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.

Journal ArticleDOI
TL;DR: In this article, the plastic deformation behavior and the effects of the impact time on the LY2 aluminum (Al) alloy during multiple laser shock processing (LSP) impacts were investigated.

Journal ArticleDOI
TL;DR: In this article, the tensile and compressive behavior of -oriented body-centered cubic (bcc) metals W, Mo, Ta and Nb with nanometer dimensions was investigated.

Journal ArticleDOI
TL;DR: In this paper, the influence of the initial microstructure on the deep drawability and the associated microstructural evolution in two different magnesium alloy sheets, AZ31 and ZE10, has been examined.

Journal ArticleDOI
TL;DR: In this paper, the mechanical behavior of an AZ31 Mg sheet at high strain rate (103 s−1) and compared with that observed at low rates (10−3 s− 1) was investigated using a Hopkinson bar at temperatures between 25 and 400°C.

Journal ArticleDOI
TL;DR: In this article, a pin-on-disk wear testing of nanocrystalline Ni-W alloys with grain sizes of 3-47nm has been carried out and the extreme conditions produced during sliding wear are found to result in structural evolution and a deviation from Archard scaling for the finest grain sizes; in the finest nanocrystine materials wear resistance is higher than would be expected based on hardness alone.

Journal ArticleDOI
TL;DR: In this article, a series of binary magnesium-based alloys have been prepared with Gd concentrations between 0.22 and 4.65 wt. These alloys were processed by hot rolling in order to refine the microstructure and examine the recrystallisation behaviour.

Journal ArticleDOI
T. Simon1, A. Kröger1, Christoph Somsen1, A. Dlouhy, Gunther Eggeler1 
TL;DR: In this article, the authors used in situ and post-mortem diffraction contrast transmission electron microscopy (TEM) to study the multiplication of dislocations during a thermal martensitic forward and reverse transformation in a NiTi shape memory alloy single crystal.

Journal ArticleDOI
TL;DR: Using a combination of experimental techniques, including anomalous small-angle scattering and atom-probe tomography, the evolution of precipitate microstructures during the different steps of retrogression and re-ageing (RRA) heat treatments of an Al-Zn-Mg-Cu alloy has been systematically evaluated as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, the authors performed quantitative bending and compression tests on micropillars made of two different amorphous alloys, with tip diameters ranging from 93 to 645 nm, in situ in a transmission electron microscope (TEM).

Journal ArticleDOI
TL;DR: In this paper, the authors use a rule of mixtures model to characterize the individual and the superposed contributions of two major mechanisms of crystal plasticity, i.e., Orowan strengthening and forest hardening.

Journal ArticleDOI
TL;DR: In this article, the authors performed uniaxial tensile tests on polyimide-supported copper films with a strong (1 1 1) fiber texture and with thickness varying from 50 nm to 1 μm.