Journal article
Modelling the X-ray powder diffraction of nitrogen-expanded austenite using the Debye formula
Metal Structures in Four Dimensions, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Department of Chemistry, Technical University of Denmark3
Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark4
Department of Mechanical Engineering, Technical University of Denmark5
X-ray Crystallography, Department of Chemistry, Technical University of Denmark6
Stress-free and homogeneous samples of nitrogen-expanded austenite, a defect-rich f.c.c. structure with a high interstitial nitrogen occupancy (between 0.36 and 0.61), have been studied using X-ray powder diffraction and Debye simulations. The simulations confirm the presence of deformation stacking faults in the structure, while twin or growth faulting can be ruled out.
Screw dislocations are abundant and the dislocation density increases with the interstitial nitrogen occupancy. Whether the N atoms are clustered or distributed randomly among the octahedral interstices was found to be indistinguishable to X-ray powder diffraction.
| Language: | English |
|---|---|
| Year: | 2008 |
| Pages: | 537-543 |
| ISSN: | 16005767 and 00218898 |
| Types: | Journal article |
| DOI: | 10.1107/S0021889808005943 |
| ORCIDs: | Oddershede, Jette , Christiansen, Thomas and Ståhl, Kenny |
