Structure and Phase Composition of Ni-Al-Co-Mе-Based Alloy Containing Rhenium and Ruthenium

Abstract:

The present study was conducted by transmission electron microscopy (TEM) in order to investigate the structure of multicomponent nickel-based alloy obtained by directional solidification and change in its phase composition at high-temperature annealing. All states of the alloy possessed monocrystalline structure with [001] orientation. The alloy under study contained other elements apart from Ni, such as: Al, Co, and also Mo, Cr, W, Ta, Re, and Ru. The alloy was investigated in three states after annealing for: 1) 118 h; 2) 372 h; 3) 1274 h at 1000°С. The basic phases that form the alloy were γ and γ′. In the state after annealing for 118 h Al₆(Re,Ru) phase was observed in an insignificant amount. After longer high temperature annealing new phases occurred, such as σ-phase and δ-phase, Laves phase. The structures occurring during annealing can be classified into four types: 1) quasi-cuboids, 2) anisotropic stripe structures, 3) anisotropic structures of striped type with σ-phase separation, 4) structureless zones with large two-phase areas.

• Periodical: Solid State Phenomena (Volume 303)
• Pages: 111-117
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.303.111
• Online since: May 2020
• Authors: Elena L. Nikonenko*, Natalya A. Popova, N.A. Koneva
• Keywords: Composite, Nickel-Based Alloy, Structure

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