Characterization of mechanically alloyed oxide dispersion-strengthened nickel-base superalloy MA760

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02665447· OSTI ID:7085250

Sha, W; Bhadeshia, H K.D.H. ^[1]

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1. Univ. of Cambridge (United Kingdom). Dept. of Materials Science and Metallurgy

The directional recrystallization behavior, the nature and stability of particles, and the [gamma][prime] precipitation behavior of a mechanically alloyed oxide dispersion-strengthened (ODS) nickel-base superalloy MA760 have been studied using a combination of microscopy, microanalysis, microhardness, and calorimetric techniques. The extruded material is in a primary recrystallized condition with a submicron grain size. Secondary recrystallization into a coarse, directional microstructure occurs by heating above 1,215 C. The stored energy driving the secondary recrystallization is estimated to be about 1 J g[sup [minus]1]. Y[sub 2]O[sub 3], Al[sub 2]O[sub 3]-Y[sub 2]O[sub 3] garnets, and chromium carbides have been identified in the extruded alloy. More Al[sub 2]O[sub 3]-Y[sub 2]O[sub 3] garnets are formed during subsequent heat treatment; with continuous variation of composition, the garnets are richer in Al[sub 2]O[sub 3] with increasing particle size. The chromium carbides present in the as-extruded material dissolve completely during heating to temperatures well below the recrystallization temperature. They can reprecipitate during cooling if the alloy is not recrystallized. The alloy contains a variety of inhomogeneities, including stringers of oxide particles and carbide depleted zones. The [gamma][prime] precipitation and dissolution characteristics are also reported.

• OSTI ID: 7085250
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 25:4; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL BASE ALLOYS
MICROSTRUCTURE
RECRYSTALLIZATION
YTTRIUM OXIDES
ALUMINIUM OXIDES
COMPOSITE MATERIALS
EXPERIMENTAL DATA
HEAT RESISTING ALLOYS
PRECIPITATION
ALLOYS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
DATA
HEAT RESISTANT MATERIALS
INFORMATION
MATERIALS
NICKEL ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360602* - Other Materials- Structure & Phase Studies