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Author Grahle, P. ♦ Arzt, E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ NICKEL ALLOYS ♦ ALUMINIUM ALLOYS ♦ CREEP ♦ MICROSTRUCTURE ♦ MILLING ♦ RECRYSTALLIZATION ♦ GRAIN SIZE ♦ INTERMETALLIC COMPOUNDS ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ METALLOGRAPHY ♦ X-RAY DIFFRACTION ♦ GRAIN GROWTH ♦ EXPERIMENTAL DATA
Abstract In order to improve the creep strength of NiAl, the authors have developed oxide-dispersion strengthened (ODS) NiAl alloys through a powder metallurgical processing route involving Mechanical Alloying (MA) and secondary recrystallization. The powders and the consolidated material are analyzed by means of TEM, quantitative metallography and X-ray diffraction. Particular attention is paid to achieving, by thermomechanical processing, a favorable microstructure in terms of creep strength, i.e., a large grain size and finely distributed dispersoids. It is found that undesirable coarsening of dispersoids during recrystallization can be reduced by encouraging abnormal grain growth (secondary recrystallization) through predeformation. The connection between grain growth and dispersoid coarsening is analyzed quantitatively. Overall, it is demonstrated that the conflicting requirements of large grains and relatively fine dispersoids can be satisfied by well-defined processing steps.
ISSN 13596454
Educational Use Research
Learning Resource Type Article
Publisher Date 1997-01-01
Publisher Place United States
Journal Acta Materialia
Volume Number 45
Issue Number 1


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