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6 article(s) from Albe, Karsten

Influence of grain size and composition, topology and excess free volume on the deformation behavior of Cu–Zr nanoglasses

Daniel Şopu and
Karsten Albe

Beilstein J. Nanotechnol. 2015, 6, 537–545, doi:10.3762/bjnano.6.56

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Figure 1: Tensile stress–strain curves for a BMG in comparison to three NGs with grain sizes of 4 nm, 10 nm a...

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Figure 2: Local atomic shear strain for Cu₆₄Zr₃₆ BMG and NGs with grain sizes of 4 nm, 10 nm and 16 nm, respe...

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Figure 3: The ψ values for a BMG in comparison to three NGs with grain sizes of 4 nm, 10 nm and 16 nm, respec...

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Figure 4: Tensile stress–strain curves for Cu₆₄Zr₃₆ and Cu₃₆Zr₆₄ BMGs and as-prepared (NG1), annealed (NG2), ...

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Figure 5: Local atomic shear strain for (a) Cu₃₆Zr₆₄ and (b) Cu₆₄Zr₃₆ BMGs and as-prepared (NG1), annealed (N...

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Figure 6: The ψ values for Cu₆₄Zr₃₆ and Cu₃₆Zr₆₄ BMGs and as-prepared (NG1), annealed (NG2), annealed and pre...

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Figure 7: The fraction of Cu-centered full icosahedra and Voronoi volume in the Cu₆₄Zr₃₆ and Cu₃₆Zr₆₄ metalli...

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Full Research Paper

Published 24 Feb 2015

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Deformation-induced grain growth and twinning in nanocrystalline palladium thin films

Aaron Kobler,
Jochen Lohmiller,
Jonathan Schäfer,
Michael Kerber,
Anna Castrup,
Ankush Kashiwar,
Patric A. Gruber,
Karsten Albe,
Horst Hahn and
Christian Kübel

Beilstein J. Nanotechnol. 2013, 4, 554–566, doi:10.3762/bjnano.4.64

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Figure 1: BF-TEM images of the initial microstructure of ncPd 1 (a) and ncPd 2 (b) with the corresponding sel...

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Figure 2: Orientation maps overlaid with reliability derived from ACOM-TEM of the as deposited sample in a) c...

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Figure 3: Orientation analysis of the as prepared sputtered ncPd film. a) X-ray diffraction pattern of the as...

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Figure 4: Crystallites recognized by ACOM-TEM for the as deposited sample and samples deformed to 5% and 10% ...

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Figure 5: a) Crystallite and b) grain size as a function of strain based on ACOM-TEM (equivalent in-plane dia...

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Figure 6: a) Twin crystallites/area as a function of strain based on the ACOM-TEM analysis (ncPd 1: red, ncPd...

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Figure 7: Stress strain behavior and evolution of twin boundary density as a function of strain for grain siz...

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Figure 8: Model of the deformation pathways: If growth twins are initially present, partial dislocations nucl...

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Published 24 Sep 2013

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Plasticity of nanocrystalline alloys with chemical order: on the strength and ductility of nanocrystalline Ni–Fe

Jonathan Schäfer and
Karsten Albe

Beilstein J. Nanotechnol. 2013, 4, 542–553, doi:10.3762/bjnano.4.63

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Figure 1: Local composition of the grain interior and the GBs as a function of the global composition for two...

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Figure 2: Atomic configurations after annealing with the hybrid MD/MC scheme. Ni atoms in the grain interior ...

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Figure 3: Stress-strain behavior and dislocation density for structures of 15 nm grain size, which were equil...

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Figure 4: Stress-strain behavior and dislocation density for structures of 15 nm grain size, which were equil...

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Figure 5: Stress-strain behavior and dislocation density for structures of 15 nm grain size, which were equil...

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Figure 6: Stress-strain behavior, dislocation density and evolution of GB volume for structures of 5 nm grain...

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Figure 7: Irreversible change in GB volume (V_GB) as a function of the irreversible change in total sample vol...

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Figure 8: Correlation between yield stress (stress at plastic strain of 0.7%) and the change in free volume i...

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Published 19 Sep 2013

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Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity

Antti Tolvanen and
Karsten Albe

Beilstein J. Nanotechnol. 2013, 4, 173–179, doi:10.3762/bjnano.4.17

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Figure 1: Two observed modes of plasticity. (a) Snapshot of the extrusion from a 15.6 Å orifice showing the d...

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Figure 2: The maximum shear component of the atomic stress tensor expressed by the colouring of the atoms (co...

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Figure 3: Extrusion from a 15 Å orifice. Hydrostatic pressure, von Mises stress and the amount of extruded ma...

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Figure 4: Extrusion from 15 Å orifice. (a) The nucleation of the first Shockley partial. (b) Two nonlocking s...

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Figure 5: Dislocations interacting at the onset of plasticity. Colouring by the length of the Burgers vectors...

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Figure 6: A dislocation multijunction blocking the dislocation mobility and nucleation in the system. Disloca...

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Figure 7: Atomic arrangement during the breaking of the dendrite. (a–b) The locking multijunction (see Figure 6) is b...

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Figure 8: Dislocation interacting to break the dendrite. (a–b) The locking multijunction (see Figure 6) is broken as ...

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Figure 9: Hydrostatic pressure and von Mises stress at the onset of plasticity versus extrusion orifice radiu...

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Figure 10: Extrusion from a 11 Å orifice. Hydrostatic pressure, von Mises stress and the amount of extruded ma...

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Figure 11: Energy per atom with respect to the fcc phase at zero pressure for fcc and amorphous Cu. Energy of ...

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Published 07 Mar 2013

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Size-dependent phase diagrams of metallic alloys: A Monte Carlo simulation study on order–disorder transitions in Pt–Rh nanoparticles

Johan Pohl,
Christian Stahl and
Karsten Albe

Beilstein J. Nanotechnol. 2012, 3, 1–11, doi:10.3762/bjnano.3.1

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Figure 1: The structure of the ordered phases with Strukturbericht designation “D0₂₂” (prototype structure: Al...

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Figure 2: The vertical lines in the plot represent equipotential lines of the free energy for constant differ...

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Figure 3: Calculated phase diagrams of Pt–Rh for three different particle sizes of 9201, 2075 and 807 atoms, ...

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Figure 4: Equilibrium configurations of large particles with 9201 atoms at different concentrations and tempe...

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Figure 5: Calculated phase diagram of bulk Pt–Rh (solid line) in comparison to that of a particle consisting ...

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Figure 6: All concentration-averaged Warren–Cowley short-range order parameters [Graphic 37] up to 8th neighbors for a Pt...

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Figure 7: Comparison of the [Graphic 28] (lower points) and [Graphic 29] (upper points) WC-order parameters versus temperature for di...

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Figure 8: Comparison of the concentration-averaged order parameters [Graphic 28] (lower points) and [Graphic 29] (upper points). The ...

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Figure 9: Comparison of the WC-order parameters [Graphic 31] (lower points) and [Graphic 32] (upper points). The Pt concentration is ...

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Figure 10: Comparison of the order parameters [Graphic 33] (lower points) and [Graphic 34] (upper points) constrained to a core region...

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Figure 11: Comparison of the 8 WC-order parameters [Graphic 39] and [Graphic 38] of three different particle sizes and bulk material a...

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Figure 12: Comparison of the 8 averaged [Graphic 37] WC-order parameters of three different particle sizes and bulk materi...

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Published 02 Jan 2012

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Kinetic lattice Monte-Carlo simulations on the ordering kinetics of free and supported FePt L1₀-nanoparticles

Michael Müller and
Karsten Albe

Beilstein J. Nanotechnol. 2011, 2, 40–46, doi:10.3762/bjnano.2.5

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Figure 1: Comparison of simulated ordering kinetics in bulk FePt alloys with results from annealing experimen...

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Figure 2: Evolution of ordering fraction in a free FePt nanoparticle of D = 5 nm compared to the case of bulk...

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Figure 3: Structure of a free 5 nm particle after 30 s of annealing time at 1000 K. Top: Pt atoms are display...

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Figure 4: Snapshots of supported FePt nanoparticles illustrating the different interface energetics investiga...

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Figure 5: Bottom panel: Evolution of LRO parameter with annealing time at 1000 K in free and supported FePt n...

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Figure 6: Evolution of LRO parameter with annealing time at 1000 K in free and supported FePt nanoparticles w...

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Published 17 Jan 2011

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Influence of grain size and composition, topology and excess free volume on the deformation behavior of Cu–Zr nanoglasses

Deformation-induced grain growth and twinning in nanocrystalline palladium thin films

Plasticity of nanocrystalline alloys with chemical order: on the strength and ductility of nanocrystalline Ni–Fe

Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity

Size-dependent phase diagrams of metallic alloys: A Monte Carlo simulation study on order–disorder transitions in Pt–Rh nanoparticles

Kinetic lattice Monte-Carlo simulations on the ordering kinetics of free and supported FePt L10-nanoparticles

Kinetic lattice Monte-Carlo simulations on the ordering kinetics of free and supported FePt L1₀-nanoparticles