Abstract
Alloys based on the nickel aluminide intermetallic compound are particularly attractive for a spectrum of applications because of their high strength and resistance to oxidation. The inferior ductility of polycrystalline nickel aluminide intermetallic alloy was improved by controlled microalloying with boron. This important development has engendered considerable scientific interest in the use of this novel engineering material for temperature-critical and environment-sensitive applications. In this study, an attempt has been made to rationalize the influence of environment on the tensile behaviour of polycrystalline Ni3Al alloy containing boron and zirconium. Slow strain tensile tests were performed on cold-deformed and annealed samples in environments of laboratory air, distilled water, and aqueous 3.5% sodium chloride solution. A comparison of the tensile properties and fracture behaviour of the polycrystalline intermetallic alloy in the different environments is made to highlight the role of environment in tensile behaviour.
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