High temperature deformation and ternary alloying of NbCr{sub 2} Laves intermetallics
- Tohoku Univ., Sendai (Japan). Inst. for Materials Research
- Miyagi National Coll. of Technology, Natori, Miyagi (Japan)
A study has been conducted to examine the effect of ternary alloying elements on high temperature deformation of the C15 NbCr{sub 2} based intermetallics in Nb-Cr-X (X = V, Mo and W) alloy systems, which have attractive properties as high temperature structural materials. The high temperature deformation of the C15 NbCr{sub 2} intermetallics can be improved by two alloying methods. One method is based on geometrical consideration for site occupation and atomic size factor of component elements and additive elements in the single phase C15 lattice; addition of Mo and V can promote dislocation movement without introducing significant hardening. The other method is based on microstructural modification through ternary alloying; moderate addition of these elements results in a variety of duplex microstructure consisting of the C15 phase and bcc solid solution without forming any intermediate phases, and can enhance the high temperature deformability. Particularly, alloys with duplex microstructure equilibrating with Cr-rich bcc solid solution is shown to exhibit superior deformability. Also, lattice property of the additive atoms in the C15 structure and phase relation between the C15 structure and the bcc solid solution are investigated by OM, XRD, TEM and ALCHEMI observations and then discussed in association with observed mechanical behavior.
- OSTI ID:
- 367628
- Report Number(s):
- CONF-960202--; ISBN 0-87339-310-4
- Country of Publication:
- United States
- Language:
- English
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