Powder processing of NiAl for elevated temperature strength
- NASA Lewis Research Center, Cleveland, OH (United States)
- Max-Planck-Inst. fuer Metallfroschung, Stuttgart (Germany)
In an effort to superimpose two different elevated temperature strengthening mechanisms in NiAl, one lot of an oxide dispersion strengthened (ODS) NiAl powder has been milled in liquid nitrogen (cryomilled) to introduce AlN particles at the grain boundaries, and a second lot of ODS powder was simply roasted in gaseous nitrogen as an alternative means to produce AlN reinforced grain boundaries. Powder from both of these lots as well as the starting material have been consolidated by hot extrusion and tested at 1,300 K. Both nitrogen roasting and cryomilling produced AlN within the ODS NiAl matrix which strengthened the alloy; however, based on the AlN content, cryomilling is more effective.
- Sponsoring Organization:
- Alexander von Humboldt-Stiftung, Bonn (Germany)
- OSTI ID:
- 571833
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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