scholarly journals Effects of Fe-Ions Irradiation on the Microstructure and Mechanical Properties of FeCrAl-1.5wt.% ZrC Alloys

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3423
Author(s):  
Runzhong Wang ◽  
Hui Wang ◽  
Xiaohui Zhu ◽  
Xue Liang ◽  
Yuanfei Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Radiation Doses ◽  
Low Density ◽  
Dislocation Loops ◽  
Transmission Electron ◽  
Fe Ions ◽  
Different Doses

Fe-13Cr-3.5Al-2.0Mo-1.5wt.% ZrC alloy was irradiated by 400 keV Fe+ at 400 °C at different doses ranging from 6.35 × 1014 to 1.27 × 1016 ions/cm2 with a corresponding damage of 1.0–20.0 dpa, respectively, to investigate the effects of different radiation doses on the hardness and microstructure of the reinforced FeCrAl alloys in detail by nanoindentation, transmission electron microscopy (TEM), and atom probe tomography (APT). The results show that the hardness at 1.0 dpa increases from 5.68 to 6.81 GPa, which is 19.9% higher than a non-irradiated specimen. With an increase in dose from 1.0 to 20.0 dpa, the hardness increases from 6.81 to 8.01 GPa, which is an increase of only 17.6%, indicating that the hardness has reached saturation. TEM and APT results show that high-density nano-precipitates and low-density dislocation loops forme in the 1.0 dpa region, compared to the non-irradiated region. Compared with 1.0 dpa region, the density and size of nano-precipitates in the 20.0 dpa region have no significant change, while the density of dislocation loops increases. Irradiation results in a decrease of molybdenum and carbon in the strengthening precipitates (Zr, Mo) (C, N), and the proportionate decrease of molybdenum and carbon is more obvious with the increase in damage.

Origins of meteoritic nanodiamonds investigated by coordinated atom‐probe tomography and transmission electron microscopy studies

2019 ◽  
Vol 55 (6) ◽  
pp. 1382-1403 ◽  
Author(s):  
Josiah B. Lewis ◽  
Christine Floss ◽  
Dieter Isheim ◽  
Tyrone L. Daulton ◽  
David N. Seidman ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Transmission Electron

Resolving the Morphology of Niobium Carbonitride Nano-Precipitates in Steel Using Atom Probe Tomography

2014 ◽  
Vol 20 (4) ◽  
pp. 1100-1110 ◽  
Author(s):  
Andrew J. Breen ◽  
Kelvin Y. Xie ◽  
Michael P. Moody ◽  
Baptiste Gault ◽  
Hung-Wei Yen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Niobium Carbonitride ◽  
Surrounding Matrix ◽  
Transmission Electron ◽  
A New Technique ◽  
Insight Into ◽  
Reconstructed Data ◽  
Magnification Effect

AbstractAtom probe is a powerful technique for studying the composition of nano-precipitates, but their morphology within the reconstructed data is distorted due to the so-called local magnification effect. A new technique has been developed to mitigate this limitation by characterizing the distribution of the surrounding matrix atoms, rather than those contained within the nano-precipitates themselves. A comprehensive chemical analysis enables further information on size and chemistry to be obtained. The method enables new insight into the morphology and chemistry of niobium carbonitride nano-precipitates within ferrite for a series of Nb-microalloyed ultra-thin cast strip steels. The results are supported by complementary high-resolution transmission electron microscopy.

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