Influence of boron doping and stoichiometry upon the Ni grain boundary diffusion in Ni{sub 3}Al intermetallic
- Academy of Sciences of the Czech Republic, Brno (Czech Republic). Inst. of Physics of Materials
- Masaryk Univ., Brno (Czech Republic). Faculty of Sciences
In recent years, the Ni{sub 3}Al compound has attracted considerable attention due to its promising characteristics. They are, first of all, the excellent high-temperature strength and the high corrosion resistance. The Ni{sub 3}Al intermetallic shows also an inverse temperature dependence of flow stress, a very strong tendency to atomic ordering and some other interesting features that make this material very challenging system for both basic research and practice. However, considerable brittleness of polycrystalline Ni{sub 3}Al is the most serious obstacle limiting severely its application as structural material. In spite of lack of the theory, that would completely explain physical origins of the grain boundary (GB) brittleness of Ni{sub 3}Al, the latter was successfully suppressed by the admixture of boron in amount of some hundreds of weight ppm. It has been shown that boron, that is known to segregate to GBs, affects significantly GB properties and, in turn, the transition behavior of Ni{sub 3}Al. The aim of this paper is to study GB diffusivity of nickel in Ni{sub 3}Al in dependence on boron doping and stoichiometry.
- OSTI ID:
- 516833
- Journal Information:
- Scripta Materialia, Vol. 37, Issue 1; Other Information: PBD: 1 Jul 1997
- Country of Publication:
- United States
- Language:
- English
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