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Microstructural observations in rapidly-solidified and heat-treated Ni3Al-Cr alloysThe microstructural development following heat treatments of several rapidly-solidified Ni3Al-Cr and Ni3Al-Cr-B alloys is presented. Depending on composition, the as-solidified samples were either 100 percent gamma-prime phase - in the form of fine antiphase domains (APD) - or a mixture of gamma-prime (APDs) and beta phases. Upon annealing, the as-solidified microstructures transform to either APD-free gamma-prime or mixtures of gamma and gamma-prime phases. For those compositions where the quenched microstructures were 100 percent gamma-prime it was observed that APD coarsening followed conventional grain-growth kinetics, but when gamma phase precipitated on the APD boundaries the rate constant changed abruptly while the time exponent remained unaffected. It was also found that alloys containing critical amounts of chromium and boron are susceptible to precipitation of the boride Cr5B3.
Document ID
19920067066
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Carro, G.
(NASA Headquarters Washington, DC United States)
Flanagan, W. F.
(Vanderbilt University Nashville, TN, United States)
Date Acquired
August 15, 2013
Publication Date
August 1, 1992
Publication Information
Publication: Acta Metallurgica et Materialia
Volume: 40
Issue: 8 Au
ISSN: 0956-7151
Subject Category
Metallic Materials
Accession Number
92A49690
Funding Number(s)
CONTRACT_GRANT: DE-AC05-76OR-00033
CONTRACT_GRANT: NAGW-810
Distribution Limits
Public
Copyright
Other

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