Characterization of the Early Stages of Phase Separation by Atom probe Tomography

1999 ◽  
Vol 580 ◽  
Author(s):  
M. K. Miller
Keyword(s):  
Phase Separation ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Alloy 718 ◽  
Early Stages ◽  
Nickel Based Superalloy ◽  
Secondary Precipitates ◽  
Isothermal Ageing

AbstractAn atom probe tomography characterization of the early stages of phase separation in the FeCu-Ni system has been performed. The development of the copper-enriched regions into copper precipitates has been investigated during isothermal ageing at 573 K and 673 K for times up to 10,000 h. The formation and growth of the secondary precipitates in the nickel based superalloy, Alloy 718, have been determined during isothermal ageing at 873 K. These secondary precipitates were found to be a mixture of the L12-ordered γ' phase and the DO22-ordered γ” phase.

Atom Probe Tomography Of Interfaces

1999 ◽  
Vol 5 (S2) ◽  
pp. 118-119
Author(s):  
M. K. Miller
Keyword(s):  
Atom Probe Tomography ◽  
Small Volume ◽  
Atom Probe ◽  
Solute Segregation ◽  
Alloy 718 ◽  
Polycrystalline Nickel ◽  
Concentration Gradients ◽  
Precipitate Morphology ◽  
Probe Field ◽  
Nickel Based Superalloy

The technique of atom probe tomography (APT) enables the x, y, and z coordinates and the elemental identities of the atoms in a small volume to be determined at the atomic level. Therefore, the APT technique may be used to characterize solute segregation to interfaces and precipitation in terms of concentration gradients and precipitate morphology. This type of information may be used to optimize the design of alloys.The material that was used to illustrate the capabilities of atom probe tomography is a complex polycrystalline nickel-based superalloy, Alloy 718. The composition of this commercial superalloy is Ni- 3.2 at. % Nb, 0.96% Al, 1.15% Ti, 20.3% Fe, 21.8% Cr, 0.26% Co, 1.8% Mo, 0.16% Mn, 0.21% Si and 0.26% C. The material was characterized after a heat treatment oM h at 1038°C + 8 h at 870°C + 500 h at 600°C. Previous atom probe field ion microscopy characterizations of this material has demonstrated that there is no intragranular precipitation after the anneal at 1038°C.

The β'-α' Interaction: a Study of early Stages of Phase Separation in a Fe-20%Cr-6%Al-0.5%Ti Alloy

2011 ◽  
Vol 172-174 ◽  
pp. 315-320
Author(s):  
Carlos Capdevila ◽  
Michael K. Miller ◽  
K.F. Russell ◽  
J. Chao ◽  
F.A. López
Keyword(s):  
Phase Separation ◽  
Atom Probe Tomography ◽  
Temporal Evolution ◽  
Theoretical Calculations ◽  
Three Dimensional ◽  
Atom Probe ◽  
Early Stages ◽  
Β Phase ◽  
Α Phase ◽  
Power Measurements

The temporal evolution of the microstructure resulting from phase separation into Fe-rich (α), Cr-rich (α¢), and Fe(Ti,Al) (β¢) phases of a Fe-20Cr-6Al-0.5Ti alloy has been analyzed by thermoelectric power measurements (TEP). The early stages of decomposition and the evolution of the three-dimensional microstructure have been analyzed by atom probe tomography (APT). The roles of Cr, Al, and Ti during the decomposition process have been investigated in terms of solute partitioning between the phases. Analysis of proximity histograms revealed that significant Al and Ti partitioning occurs, which is consistent with theoretical calculations. The results indicate that as the α-α¢ phase separation proceeds, Al and Ti are rejected into the α phase, which causes the β¢ phase to nucleate on the surface of the α¢ phase.

scholarly journals Atom Probe Tomography Characterization of Engineered Oxide Multilayered Structures

2015 ◽  
Vol 21 (S3) ◽  
pp. 845-846
Author(s):  
M. I. Nandasiri ◽  
N. Madaan ◽  
A. Devaraj ◽  
J. Bao ◽  
Z. Xu ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Multilayered Structures

Characterization of Nano-Sized Precipitates in a Mn-Based Lean Maraging Steel by Atom Probe Tomography

2011 ◽  
Vol 82 (2) ◽  
pp. 137-145 ◽  
Author(s):  
J. Millán ◽  
D. Ponge ◽  
D. Raabe ◽  
P. Choi ◽  
O. Dmitrieva
Keyword(s):  
Maraging Steel ◽  
Atom Probe Tomography ◽  
Atom Probe

Nanoscale characterization of powder materials by atom probe tomography

2011 ◽  
Vol 208 (2) ◽  
pp. 260-265 ◽  
Author(s):  
R. Larde ◽  
J. Bran ◽  
M. Jean ◽  
J.M. Le Breton
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Powder Materials ◽  
Nanoscale Characterization

scholarly journals Impact of the Co/Ni-Ratio on Microstructure, Thermophysical Properties and Creep Performance of Multi-Component γ′-Strengthened Superalloys

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1058
Author(s):  
Christopher H. Zenk ◽  
Nicklas Volz ◽  
Carolin Zenk ◽  
Peter J. Felfer ◽  
Steffen Neumeier
Keyword(s):  
Atom Probe Tomography ◽  
Lattice Misfit ◽  
Microstructural Characterization ◽  
Atom Probe ◽  
Creep Tests ◽  
Ni Content ◽  
Rich Alloy ◽  
First Time ◽  
Partitioning Behavior

The Ni content is a crucial factor for the development of γ′-strengthened Co-based superalloys and some studies have systematically addressed its influence on various properties in model superalloys. In this paper, we report for the first time the influence of the Co/Ni ratio in the more advanced nine-component superalloy ERBOCo-1: exchanging Co and Ni in this Co/Ni-based superalloy while keeping the other alloying elements constants has a big influence on a variety of material properties. The elemental segregation after casting is slightly more pronounced in the alloy with higher Ni-content. Microstructural characterization of this alloy termed ERBOCo-1X after heat-treatment reveals that the precipitates are cuboidal in the Co- and spherical in the Ni-rich alloy, indicating a decrease in the γ/γ′ lattice misfit. Analyzing the elemental partitioning behavior by atom probe tomography suggests that the partitioning behavior of W is responsible for that. Furthermore, it is found that even though Ni exhibits the highest overall concentration, the γ matrix phase is still Co-based, because Ni is strongly enriched in the γ′ precipitates. Creep tests at 900 °C reveal that even though the microstructure looks less favorable, the creep resistance of the Ni-rich alloy is slightly superior to the Co-rich variant.

scholarly journals Investigation of plasma-doped fin structure and characterization of dopants by atom probe tomography

2012 ◽  
Vol 101 (21) ◽  
pp. 213113 ◽  
Author(s):  
B. H. Kim ◽  
S. M. Park ◽  
S. W. Park ◽  
Y. B. Park ◽  
H. J. Kim ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe

A contribution to the characterization of the silicate-water interface – Part II: Atom Probe Tomography of tricalcium silicate

Micron ◽  
2018 ◽  
Vol 114 ◽  
pp. 72-77 ◽  
Author(s):  
C. Naber ◽  
T. Sowoidnich ◽  
F. Bellmann ◽  
J. Neubauer ◽  
K.A. DeRocher ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Tricalcium Silicate ◽  
Water Interface

scholarly journals Characterization of the Influence of Grain Boundary Character on Oxidation of Nickel Using Atom Probe Tomography

2013 ◽  
Vol 19 (S2) ◽  
pp. 1012-1013
Author(s):  
S.L. Welsh ◽  
J.L. Evans
Keyword(s):  
Grain Boundary ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Boundary Character ◽  
Grain Boundary Character

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

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