Anomalous precursive behaviour for the martensitic material Ni 0.625 Al 0.375

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Australian Institute of Physics
NixAl1-x alloys for 0.615 < x < 0.64 undergo a martensitic transformation upon cooling from a CsCl-type structure to a pseudo-orthorhombic structure [1]. The transformation temperature is extremely composition dependent [2] and for Ni0.625Al0.375 is ~ 80 K [1]. In previous research using an approximate cube of single crystal having x = 0.625 [3], significant strain anisotropy was detected above 80 K. It was suggested that this anomalous strain anisotropy indicated the presence of a martensite precursor within the cubic “parent” phase. The aim of the current research project is to investigate the precursive structural behaviour in the above Ni0.625Al0.375 single crystal using both elastic and inelastic neutron scattering. Results from initial experiments at both the Wombat and Taipan instruments at the Opal Research Reactor will be presented and discussed in relation to previously published strain anisotropy data determined using variable temperature, capacitance dilatometry [3].
Martensitic steels, Materials, Alloys, Transformations, Nickel, Orthorhombic lattices, Strains, Anisotropy, Inelastic scattering, OPAL Reactor
Finlayson, T. R., Danilkin, S., Studer, A. J., & Whitfield, R. E. (2011). Anomalous precursive behaviour for the martensitic material Ni 0.625 Al 0.375 . Poster presented to the Australian and New Zealand Institutes of Physics 35th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 2nd - 4th February, 2011. Retrieved from: