Ductility enhancement in NiAl (B2)-base alloys by microstructural control
Abstract
An attempt to improve ductility of NiAl (B2)-base alloys has been made by the addition of alloying elements and the control of microstructure. It has been found that a small amount of fcc γ phase formed by the addition of Fe, Co, and Cr has a drastic effect not only on the hot workability but also on the tensile ductility at room temperature. The enhancement in ductility is mainly due to the modification of Β-phase grains by the coexistence of γ phase. The effect of alloying elements on the hot forming ability is strongly related to the phase equilibria and partition behavior among γ, γ' (L12 structure), and Β phases in the Ni-Al-X alloy systems. The ductility-enhancement method shows promise for expanding the practical application of nickel aluminide.
- Publication:
-
Metallurgical Transactions A
- Pub Date:
- February 1991
- DOI:
- 10.1007/BF02656811
- Bibcode:
- 1991MTA....22..441I