scholarly journals Nanoscale Phase Separation in Al0.5CoCrFeNi(Cu) High Entropy Alloys as Studied by Atom Probe Tomography

2017 ◽  
Vol 23 (S1) ◽  
pp. 726-727 ◽  
Author(s):  
Keith E. Knipling ◽  
Joshua L. Tharpe ◽  
Peter K. Liaw
Keyword(s):  
Phase Separation ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Nanoscale Phase Separation

scholarly journals Reflections on the Spatial Performance of Atom Probe Tomography in the Analysis of Atomic Neighborhoods

2021 ◽  
pp. 1-11
Author(s):  
Baptiste Gault ◽  
Benjamin Klaes ◽  
Felipe F. Morgado ◽  
Christoph Freysoldt ◽  
Yue Li ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Atomic Scale ◽  
High Entropy Alloys ◽  
Material System ◽  
Field Evaporation ◽  
Ion Imaging ◽  
High Entropy ◽  
Spatial Performance ◽  
Pure Metals

Atom probe tomography (APT) is often introduced as providing “atomic-scale” mapping of the composition of materials and as such is often exploited to analyze atomic neighborhoods within a material. Yet quantifying the actual spatial performance of the technique in a general case remains challenging, as it depends on the material system being investigated as well as on the specimen's geometry. Here, by using comparisons with field-ion microscopy experiments, field-ion imaging and field evaporation simulations, we provide the basis for a critical reflection on the spatial performance of APT in the analysis of pure metals, low alloyed systems and concentrated solid solutions (i.e., akin to high-entropy alloys). The spatial resolution imposes strong limitations on the possible interpretation of measured atomic neighborhoods, and directional neighborhood analyses restricted to the depth are expected to be more robust. We hope this work gets the community to reflect on its practices, in the same way, it got us to reflect on our work.

scholarly journals Atom probe tomography study of an Fe25Ni25Co25Ti15Al10 high-entropy alloy fabricated by powder metallurgy

2019 ◽  
Vol 179 ◽  
pp. 372-382
Author(s):  
Zhiqiang Fu ◽  
Andrew Hoffman ◽  
Benjamin E. MacDonald ◽  
Zhenfei Jiang ◽  
Weiping Chen ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Liquid Phase Separation in Ag-Co-Cr-Fe-Mn-Ni, Co Cr-Cu-Fe-Mn-Ni and Co-Cr-Cu-Fe-Mn-Ni-B High Entropy Alloys for Biomedical Application

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 527 ◽  
Author(s):  
Takeshi Nagase ◽  
Mitsuharu Todai ◽  
Takayoshi Nakano
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Biomedical Application ◽  
Melting Process ◽  
Liquid Phase Separation ◽  
Heat Of Mixing ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Metallic Biomaterials ◽  
Fundamental Research

The liquid phase separation (LPS) behavior in Co-Cr-based high-entropy alloys (HEAs) is an important target for the development of Co-Cr-based HEAs for metallic biomaterials (BioHEAs). The solidification microstructure in Ag-Co-Cr-Fe-Mn-Ni-Ag, Co-Cr-Cu-Fe-Mn-Ni-Cu, and Co-Cr-Cu-Fe-Mn-Ni-B HEAs, which were designed as the combination of the equiatomic CoCrFeMnNi with Ag, Cu, and the interstitial element of B, was investigated as the fundamental research of LPS in Co-Cr-based HEAs. Ingots of equiatomic AgCoCrFeMnNi, equiatomic CoCrCuFeMnNi, non-equiatomic CoCrCuxFeMnNi (x = 2, 3), and CoCrCuxFeMnNiB0.2 (x = 1, 2, 3) with a small amount of B were fabricated using the arc-melting process. A macroscopic phase-separated structure was observed in the ingots of the equiatomic AgCoCrFeMnNi and CoCrCuxFeMnNiB0.2 (x = 2, 3) HEAs. The addition of a small amount of B enhanced the LPS tendency in the Co-Cr-Fe-Mn-Ni-Cu HEAs. The LPS behavior was discussed through the heat of mixing and computer coupling of phase diagrams and thermochemistry (CALPHAD).

Atomic-scale compositional characterization of a nanocrystalline AlCrCuFeNiZn high-entropy alloy using atom probe tomography

2013 ◽  
Vol 61 (12) ◽  
pp. 4696-4706 ◽  
Author(s):  
K.G. Pradeep ◽  
N. Wanderka ◽  
P. Choi ◽  
J. Banhart ◽  
B.S. Murty ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Atomic Scale ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Compositional Characterization

scholarly journals Microstructures and Mechanical Properties of As Cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux High-Entropy Alloys

2021 ◽  
Vol 8 ◽  
Author(s):  
Jiajun Li ◽  
Yu Dong ◽  
Zemin Wang ◽  
Min Liu ◽  
Yi Ding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Atom Probe ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Cu Content ◽  
Transmission Electron ◽  
Microstructures And Mechanical Properties ◽  
Fcc Phase ◽  
Xrd Patterns

This study focused on the role of Cu in the microstructure characteristics and tensile properties of novel L12-strengthened multicomponent high-entropy alloys (HEAs). A series of as-cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux (x = 0.5, 2.5, 5.0) high-entropy alloys (HEAs) were prepared. The microstructures and mechanical properties of HEAs were investigated using X-ray diffraction, a scanning electron microscope, a transmission electron microscope, and atom probe tomography. The XRD patterns of HEAs confirmed that all HEAs consisted of the FCC phase and the L12 phase. As Cu content increased, the dendritic was gradually coarsened. The spherical L12 size decreased, and number density increased in the interdendritic regions (ID). The L12 mainly contained Ni, Ti, Al, and Cu. The acicular L12 size increased and was continuously distributed in the dendritic regions (DR) as the Cu content increased gradually. The ultimate strength and elongation decreased from 1,002 MPa, 20.0% to 906 MPa, 13.1%, respectively. The segregation rates of Ti, Cu, and Al increased in the DR and ID. The L12 nano-precipitates in the DR become denser and finer, while the L12 islets in the ID region increase and elongate. Large lattice distortion caused by Cu addition weakens the strength of the L12-FCC phase boundary, leading to the premature fracture of the three HEAs, which were the main reasons for the decreases in strength and ductility as Cu content increased.

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