Journal article
On the elusive crystal structure of expanded austenite
Department of Mechanical Engineering, Technical University of Denmark1
Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark2
Department of Physics, Technical University of Denmark3
Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark4
Department of Chemistry, Technical University of Denmark5
X-ray Crystallography, Department of Chemistry, Technical University of Denmark6
No consistent structural description exists for expanded austenite that accurately accounts for the hkl-dependent peak shifts and broadening observed in diffraction experiments. The best available description for homogeneous samples is a face-centered cubic lattice with stacking faults. Here Debye simulations of stacking fault effects were compared to experimental data for macro-stress free homogeneous expanded austenite to show that a faulted structure cannot explain the observed peak displacement anomalies.
Instead it is argued that the shifts are the combined result of elastic and plastic anisotropy leading to (strongly) non-linear hkl-dependent elastic behavior during composition-induced plastic deformation on synthesis of expanded austenite.
| Language: | English |
|---|---|
| Year: | 2017 |
| Pages: | 59-62 |
| ISSN: | 18728456 and 13596462 |
| Types: | Journal article |
| DOI: | 10.1016/j.scriptamat.2017.01.006 |
| ORCIDs: | Brink, Bastian , Ståhl, Kenny , Christiansen, Thomas Lundin , Oddershede, Jette , Winther, Grethe and Somers, Marcel A. J. |
