J. Phys. IV France 112 (2003) 1063
DOI: 10.1051/jp4:20031065

Effect of additions of Re in NiAl based alloys

Yu.N. Koval¹, G.E. Monastyrsky², V.V. Odnosum¹, G.S. Firstov³ and J. van Humbeeck<sup>3

1</sup>  Institute for Metal Physics, Department of Phase Transformation, Vernadsky Street 36, 252680 Kiev 142, Ukraine
²  National Technical University of Ukraine, Peremoga Street 37, 03056 Kiev, Ukraine
³  Katholike Universiteit Leuven, MTM Department, Kastel Ahreuberg 44, 3001 Heverlee, Belgium

Abstract
An attempt to develop shape memory NiAl based alloys using macroalloying has been made. Re additions to the binary NiAl alloys result in the formation NiAl (B2), Ni ₃Al (L1 ₂), Ni ₅Al ₃, NiAl (L1 ₀), and Re phase. The microstructure of these alloys was examined with using X-ray diffraction, optical microscope and resistance measurements. The binary NiAl alloy was investigated too. It seems Re is not dissolve in NiAl matrix. Comparison of NiAl and NiAlRe alloys reveals that additions of Re lead to the creation of the special pseudosubstructure. The NiAlRe system exhibits martensite transformation. The peculiarities of the pseudosubstructure allow expecting the influence on mechanical properties of the NiAl based alloys are discussed.

© EDP Sciences 2003