Microstructural Characterization of Molybdenum Grain Boundaries by Micropillar Compression Testing and Atom Probe Tomography

2019 ◽  
Vol 56 (12) ◽  
pp. 776-786
Author(s):  
S. Jakob ◽  
A. Lorich ◽  
M. Eidenberger-Schober ◽  
W. Knabl ◽  
H. Clemens ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Atom Probe Tomography ◽  
Microstructural Characterization ◽  
Atom Probe ◽  
Compression Testing ◽  
Micropillar Compression

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 Reflections on the Analysis of Interfaces and Grain Boundaries by Atom Probe Tomography

2020 ◽  
Vol 26 (2) ◽  
pp. 247-257 ◽  
Author(s):  
Benjamin M. Jenkins ◽  
Frédéric Danoix ◽  
Mohamed Gouné ◽  
Paul A.J. Bagot ◽  
Zirong Peng ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Atom Probe Tomography ◽  
Compositional Analysis ◽  
Atom Probe ◽  
Atomic Scale ◽  
Three Dimensions ◽  
Specimen Preparation ◽  
Structure Property ◽  
Wide Range

AbstractInterfaces play critical roles in materials and are usually both structurally and compositionally complex microstructural features. The precise characterization of their nature in three-dimensions at the atomic scale is one of the grand challenges for microscopy and microanalysis, as this information is crucial to establish structure–property relationships. Atom probe tomography is well suited to analyzing the chemistry of interfaces at the nanoscale. However, optimizing such microanalysis of interfaces requires great care in the implementation across all aspects of the technique from specimen preparation to data analysis and ultimately the interpretation of this information. This article provides critical perspectives on key aspects pertaining to spatial resolution limits and the issues with the compositional analysis that can limit the quantification of interface measurements. Here, we use the example of grain boundaries in steels; however, the results are applicable for the characterization of grain boundaries and transformation interfaces in a very wide range of industrially relevant engineering materials.

Characterization of Grain Boundaries in Cu(In,Ga)Se$_{\bf 2}$ Films Using Atom-Probe Tomography

2011 ◽  
Vol 1 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Oana Cojocaru-Mirédin ◽  
Pyuck-Pa Choi ◽  
Daniel Abou-Ras ◽  
Sebastian S. Schmidt ◽  
Raquel Caballero ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Atom Probe Tomography ◽  
Atom Probe

Microstructural Characterization of an Al-Li-Mg-Cu Alloy by Correlative Electron Tomography and Atom Probe Tomography

2014 ◽  
Vol 20 (4) ◽  
pp. 1022-1028 ◽  
Author(s):  
Xiangyuan Xiong ◽  
Matthew Weyland
Keyword(s):  
Atom Probe Tomography ◽  
Electron Tomography ◽  
Microstructural Characterization ◽  
Atom Probe ◽  
Precipitate Phase ◽  
Cu Alloy ◽  
Geometric Reconstruction ◽  
Tomography Data ◽  
Strong Agreement

AbstractCorrelative electron tomography and atom probe tomography have been carried out successfully on the same region of a commercial 8090 aluminum alloy (Al-Li-Mg-Cu). The combination of the two techniques allows accurate geometric reconstruction of the atom probe tomography data verified by crystallographic information retrieved from the reconstruction. Quantitative analysis of the precipitate phase compositions and volume fractions of each phase have been obtained from the atom probe tomography and electron tomography at various scales, showing strong agreement between both techniques.

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
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