Atom‐probe tomography and transmission electron microscopy of the kamacite–taenite interface in the fast‐cooled Bristol IVA iron meteorite
Abstract
We report the first combined atom‐probe tomography (APT) and transmission electron microscopy (TEM) study of a kamacite–tetrataenite (K–T) interface region within an iron meteorite, Bristol (IVA). Ten APT nanotips were prepared from the K–T interface with focused ion beam scanning electron microscopy (FIB‐SEM) and then studied using TEM followed by APT. Near the K‐T interface, we found 3.8 ± 0.5 wt% Ni in kamacite and 53.4 ± 0.5 wt% Ni in tetrataenite. High‐Ni precipitate regions of the cloudy zone (CZ) have 50.4 ± 0.8 wt% Ni. A region near the CZ and martensite interface has IVA iron meteorite and furthers our knowledge of the phase composition changes in a fast‐cooled iron meteorite below 400 °C. We demonstrate that APT in conjunction with TEM is a useful approach to study the major, minor, and trace elemental composition of nanoscale features within fast‐cooled iron meteorites.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 15, 2017
- Source ID
- 10.1111/maps.12988
Entities
People
- Andrew M. Davis
- David N. Seidman
- Dean J. Miller
- Dieter Isheim
- Nestor J. Zaluzec
- Philipp R. Heck
- Surya Rout
- Thomas Stephan
Organizations
- Argonne National Laboratory
- Field Museum of Natural History
- National Aeronautics and Space Administration
- National Science Foundation
- Northwestern University
- Office of Naval Research
- Tawani Foundation
- University of Chicago