Polymorphic and coherency transition of Y–Al complex oxide particles with extrusion temperature in an Al-alloyed high-Cr oxide dispersion strengthened ferritic steel
The phase and metal/oxide interface structure of the nanometer-scale particles in an Al-alloyed high-Cr oxide dispersion strengthened ferritic steel extruded at 1150 °C and 1050 °C were characterized by high-resolution transmission electron microscopy and diffraction contrast techniques, including w...
Gespeichert in:
Veröffentlicht in: | Acta materialia 2011-02, Vol.59 (3), p.992-1002 |
---|---|
Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | The phase and metal/oxide interface structure of the nanometer-scale particles in an Al-alloyed high-Cr oxide dispersion strengthened ferritic steel extruded at 1150
°C and 1050
°C were characterized by high-resolution transmission electron microscopy and diffraction contrast techniques, including weak beam electron microscopy. After extrusion at 1150
°C, yttrium–aluminum–hexagonal (YAH, YAlO
3) and yttrium–aluminum–perovskite (YAP, YAlO
3) oxides (diameter ⩽10
nm) constitute ∼55% and 38% of the particles, respectively; ∼78% of the particles (4.5–10
nm in diameter), which include 40% YAH oxide and 38% YAP phase with misfit (translational) moiré fringe spacing of 2.15
nm and 1.65
nm, respectively, are semi-coherent with the matrix. After extrusion at 1050
°C, almost all the particles are YAH phase, and ∼86.5% (diameter |
---|---|
ISSN: | 1359-6454 1873-2453 |
DOI: | 10.1016/j.actamat.2010.10.026 |