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Iron nitride, α″-Fe16N2, around <100> interstitial type dislocation loops in neutron-irradiated iron.
- Source :
- Philosophical Magazine; May2021, Vol. 101 Issue 10, p1202-1213, 12p
- Publication Year :
- 2021
-
Abstract
- Atom probe tomography (APT) and selected area electron diffraction (SAED) by transmission electron microscopy (TEM) were applied to nano-scale precipitates formed in a neutron-irradiated iron (99.99% pure) at high temperatures. In the conventional TEM, we discovered donut-type precipitates on the {100} planes that formed at the dilatational side of interstitial type dislocation loops with the Burgers vector of <100> on the habit planes of {100} in the bcc iron lattice. The precipitates were identified as nitride, bct α″-Fe<subscript>16</subscript>N<subscript>2</subscript>, by chemical composition and lattice structural analyses using APT and SAED. Image contrasts of the α″-Fe<subscript>16</subscript>N<subscript>2</subscript> in a weak beam dark-field electron microscopy study were carefully analysed with the diffraction vector and the sign of deviation parameter from the Bragg condition, and it was concluded to be a selective visualisation of α″-Fe<subscript>16</subscript>N<subscript>2</subscript> on one of the {100} planes. These results were in agreement with the crystallographic orientation between the α″-Fe<subscript>16</subscript>N<subscript>2</subscript> and matrix iron, thereby bridging a knowledge gap in α″-Fe<subscript>16</subscript>N<subscript>2</subscript> formation during neutron irradiation using a sodium-cooled experimental fast reactor, JOYO, or a 14 MeV D-T neutron source, RTNS-II. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14786435
- Volume :
- 101
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Philosophical Magazine
- Publication Type :
- Academic Journal
- Accession number :
- 150087064
- Full Text :
- https://doi.org/10.1080/14786435.2021.1891317