Atom probe tomography on complex materials

Atom probe informed simulations of dislocation–precipitate interactions reveal the importance of local interface curvature
Acta Materialia 92 (2015) 33-45
Atom probe informed simulations of dislocation–precipitate interactions reveal the importance of local interface curvature
A. Prakash, J. Guenole, J. Wang, J. Müller, E. Spiecker, M.J. Mills, I. Povstugar, P. Choi, D. Raabe and E. Bitzek
Acta Materialia 92 (2015) 33 Atom probe [...]
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Acta Materialia 92 (2015) 33-45 Atom probe informed simulations of dislocation–precipitate interactions reveal the importance of local interface curvature A. Prakash, J. Guenole, J. Wang, J. Müller, E. Spiecker, M.J. Mills, I. Povstugar, P. Choi, D. Raabe
Acta Materialia 78 (2014) 78-85
Elemental partitioning and mechanical properties of Ti- and Ta-containing Co–Al–W-base superalloys studied by atom probe tomography and nanoindentation
Ivan Povstugar, Pyuck-Pa Choi,Steffen Neumeier, Alexander Bauer, Christopher H. Zenk, Mathias Goken, Dierk Raabe
Acta Mater 2014 Co base superalloy atom [...]
PDF-Dokument [768.8 KB]

The interaction of dislocations with precipitates is an essential strengthening mechanism in metals, as exemplified by the superior high- temperature strength of Ni-base superalloys. Here we use atomistic simulation samples generated from atom probe tomography data of a single crystal superalloy to study the interactions of matrix dislocations with a gamma' precipitate in molecular dynamics simulations. It is shown that the precipitate morphology, in particular its local curvature, and the local chemical composition significantly alter both, the misfit dislocation network which forms at the precipitate interface, and the core structure of the misfit dislocations. Simulated tensile tests reveal the atomic scale details of many experimentally observed dislocation–precipitate interaction mechanisms, which cannot be reproduced by idealized simulation setups with planar interfaces. We thus demonstrate the need to include interface curvature in the study of semicoherent precipitates and introduce as an enabling method atom probe tomography-informed atomistic simulations.

 

Shear-Induced Mixing Governs Codeformation of Crystalline-Amorphous Nanolaminates
PRL 113, 035501 (2014) PHYSICAL REVIEW LETTERS
Deformation of ductile crystalline-amorphous nanolaminates is not well understood due to the complex interplay of interface mechanics, shear banding, and deformation-driven chemical mixing. Here we present indentation experiments on 10 nm nanocrystalline Cu–100 nm amorphous CuZr model multilayers to study these mechanisms down to the atomic scale. By using correlative atom probe tomography and transmission electron microscopy we find that crystallographic slip bands in the Cu layers coincide with noncrystallographic shear bands in the amorphous CuZr layers. Dislocations from the crystalline layers drag Cu atoms across the interface into the CuZr layers. Also, crystalline Cu blocks are sheared into the CuZr layers. In
these sheared and thus C
PHYSICAL REVIEW LETTERS vol 113 - page 0[...]
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Segregation Stabilizes Nanocrystalline Bulk Steel with Near Theoretical Strength
PRL 113, 106104 (2014) PHYSICAL REVIEW LETTERS
Grain refinement through severe plastic deformation enables synthesis of ultrahigh-strength nanostructured materials. Two challenges exist in that context: First, deformation-driven grain refinement is limited by dynamic dislocation recovery and crystal coarsening due to capillary driving forces; second, grain boundary sliding and hence softening occur when the grain size approaches several nanometers. Here, both challenges have been overcome by severe drawing of a pearlitic steel wire (pearlite: lamellar structure of alternating iron and iron carbide layers). First, at large strains the carbide phase dissolves via mechanical alloying, rendering the initially two-phase pearlite structure into a carbon-supersaturated iron phase. This carbon-ric
Phys Rev Lett vol 113 page 106104 (2014)[...]
PDF-Dokument [2.2 MB]
Grain Boundary Segregation in Nanocrystalline Material
Grain boundary segregation leads to nanoscale chemical variations that can alter a material's performance by orders of magnitude. To understand this phenomenon, a large number of grain boundaries is p
PhysRevLett.112.126103.pdf
PDF-Dokument [842.8 KB]
Designing Heusler nanoprecipitates by elastic misfit stabilization in Fe–Mn maraging steels
B2 NiMn and Ni2MnAl Heusler nanoprecipitates are designed via elastic misfit stabilization in Fe–Mn maraging steels by combining transmission electron microscopy (TEM) correlated atom probe tomography (APT) with ab initio simulations.
Acta Mater 2014 Fe-Mn maraging steel Heu[...]
PDF-Dokument [2.6 MB]
Atom probe tomography study of ultrahigh nanocrystallization rates in FeSiNbBCu soft magnetic amorphous alloys on rapid annealing
Rapid annealing (4–10 s) induced primary crystallization of soft magnetic Fe–Si nanocrystals in a Fe73.5Si15.5Cu1Nb3B7 amorphous alloy has been systematically studied by atom probe tomography in c
Acta Mater FeSiNbBCu nanocrystalline mag[...]
PDF-Dokument [1.6 MB]
Atomic-scale analysis of carbon partitioning between martensite and austenite by atom probe tomography and correlative transmission electron microscopy
Carbon partitioning is investigated by means of atom probe tomography and correlative transmission electron microscopy. A model steel (Fe–0.59 wt.% C (2.7 at.% C)–2.0 wt.% Si–2.9 wt.% Mn) with m
Acta Mater 2014 carbon partitioning mart[...]
PDF-Dokument [4.0 MB]
Y. Toji et al. / Acta Materialia 65 (2014) 215–228
Nanocrystalline Fe–C alloys produced by ball milling of iron and graphite
2013-Acta-Nanocrystalline Fe–C alloys by[...]
PDF-Dokument [2.1 MB]
Element-Resolved Corrosion Analysis of Stainless-Type Glass-Forming Steels
Ultrathin passive films effectively prevent the chemical attack of stainless steel grades in corrosive environments; their stability depends on the interplay between structure and chemistry of the con
Science-2013-Duarte-372-6.pdf
PDF-Dokument [1.7 MB]
Spheroidized Carbide Dissolution and Elemental Partitioning in High Carbon Bearing Steel 100Cr6
Characterization of high carbon bearing steel 100Cr6 using electron microscopy
and atom probe tomography in combination with multi-component diffusion simulations.
partitioning carbide atom probe tomograp[...]
PDF-Dokument [1.1 MB]
Atom Probe Tomography of Compound Semiconductors for Photovoltaic and Light-Emitting Device Applications
Compound semiconductors belong to the most important materials for optoelectronic applications. Full understanding of the properties of compound semiconductor devices requires quantitative composition
Microscopy Today 2012 atom probe analysi[...]
PDF-Dokument [1.9 MB]
Interface-directed spinodal decomposition in TiAlN/CrN multilayer hard coatings studied by atom probe tomography
APT-TiAlN-CrN multilaerys Acta-2013.pdf
PDF-Dokument [3.5 MB]
Influence of supersaturated carbon on the diffusion of Ni in ferrite determined by atom probe tomography
In pearlitic steel wires dissociation of cementite occurs during deformation. Here we study the influence of carbide decomposition on the diffusion of nickel in ferrite by atom probe tomography.
2013-Scripta-Kresse-diffusion of Ni in fe[...]
PDF-Dokument [353.5 KB]
Grain boundary segregation in a bronze-route Nb3Sn superconducting wire studied by atom probe tomography
We study grain boundary segregation in a bronze-route Nb3Sn superconducting wire
by atom probe tomography.
Supercond. Sci. Techno. 26 (2013) 05500R[...]
PDF-Dokument [5.3 MB]
Atomic-scale investigation of precipitates in bainite in 100Cr6 bearing steel by atom probe tomography and ab initio calculations
Atomic-scale investigation of e and h precipitates in bainite in 100Cr6 bearing steel by atom probe tomography and ab initio calculations
atom probe tomography bearing steel 100C[...]
PDF-Dokument [1.8 MB]
Segregation engineering leads to nanoscale martensite to austenite phase transformation at grain boundaries: A pathway to ductile martensite
In an Fe–9 at.% Mn maraging alloy annealed at 450 C reversed allotriomorphic austenite nanolayers appear on former Mn decorated lath martensite boundaries. The austenite films are 5–15 nm thick an
Acta-Mater-2013-Nanoscale-austenite-form[...]
PDF-Dokument [6.0 MB]
Evidence for the formation of ordered carbides in a ferrite-based low-density Fe–Mn–Al–C alloy studied by transmission electron microscopy and atom probe tomography
We study the structure and chemical composition of the j-carbide formed as a result of isothermal transformation in an Fe–3.0Mn–5.5Al–0.3C alloy using transmission electron microscopy and APT:
Scripta-kappa-carbides-in-steel.pdf
PDF-Dokument [1.0 MB]
Scripta Materialia 68 (2013) 348
Atomic-scale compositional characterization of a nanocrystalline AlCrCuFeNiZn high-entropy alloy using atom probe tomography
Acta Materialia 61 (2013) 4696–4706
Acta-Materialia-2013-atom-probe-high-ent[...]
PDF-Dokument [6.1 MB]
Atom probe analysis of alloy 617 B (Boron-doped)
Development of micro- and nanostructure of a Ni-based superalloy (alloy 617B) at 700 °C analysed by electron microscopy and atom probe tomography (LEAP HX)
2012_Acta-Mater-alloy-617.pdf
PDF-Dokument [2.4 MB]
Joint TEM and APT study on alloy 617B
Atom probe analysis on Cu Ag Nb wires
Raabe_Hono_Acta Materialia 57 (2009) 525[...]
PDF-Dokument [1.7 MB]
Metallic composites processed via extreme deformation: Toward the limits of strength in bulk materials
Metals_at_extremes-MRS_Bulletin-Dec2010.[...]
PDF-Dokument [2.2 MB]
Deformation-driven cementite decomposition pearlite
Atomistic mechanisms of deformation-induced
cementite decomposition in wire drawn pearlite
pearlite_decomposition_Acta_Materialia_2[...]
PDF-Dokument [2.8 MB]
Exploring the p-n junction region in Cu(In,Ga)Se2 thin-film solar cells at the nanometer-scale
Here we study the CdS/Cu(In,Ga)Se2 p-n junction region in Cu(In,Ga)Se2 thin-film solar cells using atom probe tomography. A Cu-, Ga-depleted, and Cd-doped region of about 1 nm thickness is detected at
Appl-Phys-Letters-2012-pn junction in Cu[...]
PDF-Dokument [2.2 MB]
Pearlite during heat treatment
Evolution of strength and microstructure during annealing of heavily cold-drawn 6.3 GPa hypereutectoid pearlitic steel wire
Acta mater Vol 60 2012-heat treated pear[...]
PDF-Dokument [2.7 MB]
Heavily cold drawn pearlitic steel
Atom probe tomography characterization of heavily cold drawn pearlitic steel wire
ULTRAM11133.pdf
PDF-Dokument [611.4 KB]
Analysis of interfaces between austenite and martensite in Fe Mn steel
2011_Acta_Materialia_APT_Steel-Fe-Mn.pdf
PDF-Dokument [2.3 MB]
Complete volume: Structural metals at extremes
Metals_at_extremes-MRS_Bulletin-Dec2010_[...]
PDF-Dokument [5.5 MB]
cementite in pearlite
(S)TEM and atom probe tomography study of InGaN
Journ_of_Physics_ConfSeries_326_012029_2[...]
PDF-Dokument [2.0 MB]
Thermal stability of TiAlN/CrN multilayer coatings
Thermal stability of TiAlN/CrN multilayer coatings studied by atom probetomography
1-s2.0-S0304399110003025-main.pdf
PDF-Dokument [3.1 MB]
atom probe analysis of nitride multilayers
Nanoscale austenite reversion in a ductile 2 GPa Fe–Cr–C steel
Acta-2012-Austenite-reversion-Fe-Cr-C.pd[...]
PDF-Dokument [2.9 MB]
Atomic-Scale composition and structures of steels analyzed by atom probe tomography
Atomic-Scale composition and structures of steels analyzed by atom probe tomography
2012_Steel_Atom-probe_Microscopy-Today.p[...]
PDF-Dokument [1.4 MB]
Atomic scale effects of alloying, partitioning, solute drag and austempering on the mechanical properties of high-carbon bainitic–austenitic TRIP steels
Understanding alloying and thermal processing at an atomic scale is essential for the optimal design of high-carbon (0.71 wt.%) bainitic–austenitic transformation-induced plasticity (TRIP) steels. W
2012-Acta-Mater-Bainite-Austenite.pdf
PDF-Dokument [3.2 MB]
J.-B. Seol et al. / Acta Materialia 60 (2012) 6183
Pulsed-laser atom probe studies of a precipitation hardened maraging TRIP steel
A precipitation hardened maraging TRIP steel was analyzed using a pulsed laser atom probe. The laser pulse energy was varied from 0.3 to 1.9 nJ to study its effect on the measured chemical composition
APT-ultramicroscopy-TRIP steel.pdf
PDF-Dokument [930.5 KB]

 

Acta Mat. 2011, 59, p. 364