Khalil-Allafi, Jafar; Schmahl, Wolfgang W.; Wagner, M.; Sitepu, H.; Többens, D. M.; Eggeler, Gunther
The influence of temperature on lattice parameters of coexisting phases in NiTi shape memory alloys - A neutron diffraction study.
In: Materials Science and Engineering A, Vol. 378, No. 1-2 SPEC. ISS: pp. 161-164
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NiTi shape memory alloys were investigated by Rietveld refinement of neutron diffraction data at various temperatures. For an aged sample of nominal composition Ni50.7Ti49.3 at 294 K, B2 austenite, R-phase, and Ni4Ti3 precipitates coexist, and the Rietveld refinement provides accurate lattice parameters for the phases in this microstructure. The observed rhombohedral shape deformation occurring with the formation of Ni4Ti3 and R-phase in the B2 matrix is similar in magnitude and of opposite sign. Thus the strain field around a Ni4Ti3 precipitate can be compensated by a single variant of R-phase.