On the precipitation sequence in a Ni-based superalloy: A Coincidence Doppler Broadening study

C. E. MACCHI; A. SOMOZA; G. SANTOS; M. PETKOV; K. G. LYNN

PHYSICA STATUS SOLIDI C

WILEY-VCH Verlag GmbH & Co. KGaA

Año: 2007 p. 3542 - 3545

The precipitation sequence at 700 °C of the Ni3(Ti,Al)-type ordered γ’ phase in the commercial nickelbasedsuperalloy Inconel X-750 was investigated using Coincidence Doppler Broadening (CDB) technique.The results obtained are discussed in terms of positron annihilation in two well-defined states: onecorresponding to the matrix (γ phase) and a second related to the γ’ precipitates. Between these two agingstages, CDB distributions corresponding to selected intermediate aging treatments could be presented exactly,within the experimental scatter, as a linear combination of the γ and γ’ signatures