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Polymorphic and coherency transition of Y–Al complex oxide particles with extrusion temperature in an Al-alloyed high-Cr oxide dispersion strengthened ferritic steel
- Source :
-
Acta Materialia . Feb2011, Vol. 59 Issue 3, p992-1002. 11p. - Publication Year :
- 2011
-
Abstract
- Abstract: 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, YAlO3) and yttrium–aluminum–perovskite (YAP, YAlO3) oxides (diameter ⩽10nm) constitute ∼55% and 38% of the particles, respectively; ∼78% of the particles (4.5–10nm in diameter), which include 40% YAH oxide and 38% YAP phase with misfit (translational) moiré fringe spacing of 2.15nm and 1.65nm, respectively, are semi-coherent with the matrix. After extrusion at 1050°C, almost all the particles are YAH phase, and ∼86.5% (diameter <4.5nm) are coherent with the matrix. The coherency of the oxides is size dependent. The crystallographic orientation correlations of the oxides and matrix were found. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13596454
- Volume :
- 59
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Acta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 57079467
- Full Text :
- https://doi.org/10.1016/j.actamat.2010.10.026