Orientation of nickel-based alloy after thermal treatment

Nikonenko, Elena; Popova, Natalya; Koneva, Nina; Qin, Rongshan and Gromov, Victor (2017). Orientation of nickel-based alloy after thermal treatment. In: AIP Conference Proceedings (Panin, Victor E.; Psakhie, Sergey G. and Fomin, Vasily M. eds.), AIP Publishing, 1909, article no. 020148.

DOI: https://doi.org/10.1063/1.5013829

Abstract

The paper presents transmission electron microscopy investigations of Ni-Al-Co alloy with γ′- and γ -phases obtained by directional crystallization. The main alloying elements are Cr, Ta, and Re in the amount of no more than 3.5 аt % each. W and Mo are present in a smaller amount. The alloy structure is investigated in two states: (1) original (after directional crystallization and long-term homogenezation which includes a series of annealing ranging from 1285 to 1340°С) and (2) original state subjected to subsequent annealing within 900–1000°С temperature range during 105–1143 h. The experiments show that the annealing process causes the fracture of the ideal quasi-cuboid structure of the γ′-phase and modifies its preferable orientation. The increase in the annealing temperature modifies the morphology of the γ′-phase that, in turn, changes the grain orientation in the alloy.