TEM study of precipitation in a NiAl-3Ti-0.5Hf single-crystal allow
Conference
·
OSTI ID:468957
- NASA Lewis Research Center, Cleveland, OH (United States)
- Univ. of Virginia, Charlottesville, VA (United States); and others
Three directionally solidified NiAl single-crystal alloys, NiAl-3Ti, NiAl-0.5Hf and NiAl-3Ti-0.5Hf (at.%), were grown by a Bridgeman technique using high purity alumina crucibles. The ingots were homogenized for 32h at 1644 K followed by aging for 6h at 1255 K and finally furnace cooled under an argon atmosphere. This heat treatment was found to be very effective in dissolving Hf-rich interdendritic particles that were present in the as-cast structure, and at the same time it produced fine second-phase precipitates in the alloy.
- OSTI ID:
- 468957
- Report Number(s):
- CONF-960877--
- Country of Publication:
- United States
- Language:
- English
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