Microstructure of a spray deposited intermetallic compound alloy of Ni-Al-Mo system

Abstract

The microstructure of a spray deposited intermetallic compound alloy of Ni-Al-Mo system (Ni₃Al-Mo intermetallic compound alloy) prepared by a spray atomization deposition was studied in detail by using optical metallography, XRD, DTA, SEM, TEM, HREM and computer simulation. The preform consists of uniform and equiaxial grains, ranging from 10–40 μm, with some microporosity. Besides the main phases of the matrix alloy γ′ and γ, Ni₂Mo and Ni₃Mo phases are also found within the γ network. A new Ni enriched phase in the γ phase was identified to have face-centered cubic structure with a lattice constant α=1.09 nm and space group Fm3m.

Keywords

spray atomization co-deposition / Ni₃Al-Mo superalloy / microstructure

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