Dependence of small-angle neutron scattering contrast on the difference in thermal expansions of phases in two-phase alloys

0333204 - ÚJF 2010 RIV GB eng J - Journal Article
Strunz, Pavel - Gilles, R. - Mukherji, D. - Hofmann, M. - Del Genovese, D. - Roesler, J. - Hoelzel, M. - Davydov, Vadim
Dependence of small-angle neutron scattering contrast on the difference in thermal expansions of phases in two-phase alloys.
Journal of Applied Crystallography. Roč. 42, č. 6 (2009), s. 981-989. ISSN 0021-8898. E-ISSN 1600-5767
Institutional research plan: CEZ:AV0Z10480505
Keywords : BASE SUPERALLOY SC16 * SANS
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.018, year: 2009

Theoretical expressions describing small-angle neutron scattering (SANS) contrast dependence on temperature in the region where no phase-composition changes occur were derived for two-phase Ni superalloys. The theory is based on the difference in thermal expansion of the two primary phases, gamma and gamma'. The simulations show that the scattering contrast temperature evolution is significant enough to be considered in in situ SANS experiments with superalloys at elevated temperatures. The simulations performed show that the magnitude of the scattering contrast at room temperature is firmly connected with the particular shape of the scattering contrast temperature dependence. This fact can be used for determination of the scattering contrast without a knowledge of the compositions of the individual phases. The theoretical expressions derived for scattering contrast were proven experimentally on an Ni-Fe-base alloy, DT706..
Permanent Link: http://hdl.handle.net/11104/0005561