Thermal evolution of high-purity and boron-doped sub-microcrystalline Ni{sub 3}Al produced by severe plastic deformation
- Russian Academy of Sciences, Ufa (Russian Federation). Inst. of Metals Superplasticity Problems
- CNRS, Vitry-sur-Seine (France)
- Ufa State Aviation Univ. (Russian Federation). Inst. of Physics of Advanced Materials
The influence of boron on the structural stability of sub-microcrystalline Ni{sub 3}Al intermetallic compounds was investigated by comparing a high-purity material with a boron-doped (0.1 wt%) compound. The nanocrystalline structure was obtained by severe shear deformation under quasi-hydrostatic pressure. Residual electrical resistivity, Vickers microhardness, X-ray diffraction and transmission electron microscopy were used to characterize the material evolution during thermal treatments in the temperature range 293--1,313 K. After severe deformation the materials were disordered, with a small crystallite size of about 20 nm, similar in both materials. During isochronal anneals, the evolution of the microstructure, the long-range ordering and the recovery of the investigated properties took place at higher temperatures in the boron-doped compound, i.e. the thermal stability of the cold-worked structure was higher.
- OSTI ID:
- 684387
- Journal Information:
- Acta Materialia, Vol. 47, Issue 11; Other Information: PBD: 8 Sep 1999
- Country of Publication:
- United States
- Language:
- English
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