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Elevated Temperature Compressive Strength Properties of Oxide Dispersion Strengthened NiAl After Cryo-milling and Roasting in NitrogenIn an effort to superimpose two different elevated temperature strengthening mechanisms in NiAl, several lots of oxide dispersion strengthened (ODS) NiAl powder have been cryo-milled in liquid nitrogen to introduce AlN particles at the grain boundaries. As an alternative to cryo-milling, one lot of ODS NiAl was roasted in nitrogen to produce AlN. Both techniques resulted in hot extruded AlN-strengthened, ODS NiAl alloys which were stronger than the base ODS NiAl between 1200 and 1400 K. However, neither the cryo-milled nor the N2-roasted ODS NiAl alloys were as strong as cryo-milled binary NiAl containing like amounts of AlN. The reason(s) for the relative weakness of cryo-milled ODS NiAl is not certain; however the lack of superior strength in N2-roasted ODS NiAl is probably due to its relatively large AlN particles.
Document ID
19980233225
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Whittenberger, J. Daniel (NASA Lewis Research Center Cleveland, OH United States)
Grahle, Peter (Max-Planck-Inst. fuer Metallforschung Stuttgart, Germany)
Arzt, Eduard (Max-Planck-Inst. fuer Metallforschung Stuttgart, Germany)
Hebsur, Mohan (Ohio Aerospace Inst. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1998
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA/TM-1998-208399
E-11168
NAS 1.15:208399
Report Number: NASA/TM-1998-208399
Report Number: E-11168
Report Number: NAS 1.15:208399
Funding Number(s)
PROJECT: RTOP 523-21-13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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