Abstract
The intermetallic phase NiAl is a perspective material for high-temperature and shape memory effect applications. This phase is stable in a wide composition range and shows thermoelastic martensitic transformations in a region supersaturated in nickel. It is known that formation of Ni{sub 5}Al{sub 3}, Ni{sub 2}Al, Ni{sub 3}Al phases influences the martensitic transformation and, consequently, the shape memory effect. The aim of this paper is to throw more light upon structure changes of the mentioned phases using resistivity measurements during heating and cooling of the nickel rich NiAl phase specimens within a relatively broad temperature region ({minus}180 C to 900 C). Identification of the phases was done using the Ni-Al phase diagram, their experience in SEM investigation of the structural changes in this system, and electrical properties of the phases.
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