Evolution of the martensitic transformation of the high-temperature B2-phase of the TiPd-TiNi alloys has been studied. With increasing nickel content the scheme of martensitic transformation is changed from B2→B19 through B2→B19→B19' and B2→R(ω) →B19' to B2→B19', thereby the degree and range of the premartensitic softening of the lattice are increased
The pseudopotential method and thermodynamic perturbation theoryare applied to investigate the thermodynamics of Ni-AI alloys. The Einstein model approximation in the solid phase and the PercusYevick hard-sphere approximation in the liquid phase are chosen as reference systems. I n all the calculations the local Animalu pseudopotential and the non-local pseudopotential with resonant contribution in the case of a transition metal are used. Thestaticconcentration-wave method isapplied toinvestigate the ordering process in the solid phase. Taking charge transfer into consideration within the framework of the non-local resonant porential model, we have described the featuresofthe mainexcess mixing characteristics and the dynamic viscosity in the liquid system studied. I t is shown that in Ni5,,Alw alloy the Kauzmann reduced temperature is higher than in pure Ni but insufficient for ready glass formation.
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