Y{sub 2}O{sub 3} morphology in an oxide dispersion strengthened FeAl alloy prepared by mechanical alloying

Book · Wed Dec 31 04:00:00 EST 1997

OSTI ID:571923

Inkson, B J ^[1]; Threadgill, P L ^[2]

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1. Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany)
2. TWI, Abington (United Kingdom)

The microstructure of an oxide dispersion strengthened FeAl (Zr,B) alloy, manufactured by mechanical alloying then extrusion, has been examined by HREM. Y{sub 2}O{sub 3} is dispersed throughout the FeAl matrix as particles, ranging in size from 5 nm upwards, which are effective in pinning the bulk dislocations. Although in the main the observed oxide particles are irregular in morphology, a significant minority of particles exhibit faceted surfaces. In particular, the facets of the Y{sub 2}O{sub 3} particles are observed to coincide with {l_brace}100{r_brace}{sub B2}, {l_brace}110{r_brace}{sub B2} and {l_brace}112{r_brace}{sub B2} planes of the surrounding bulk FeAl matrix. In addition, HREM imaging reveals uncoupled 1/2<111>{sub FeAl} superpartial dislocations lying a few nanometers from some of the FeAl-Y{sub 2}O{sub 3} interfaces.

• OSTI ID: 571923
• Report Number(s): CONF-961202--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COMPOSITE MATERIALS
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MICROSTRUCTURE
MILLING
YTTRIUM OXIDES