Substitution Effect of the Third Element X on the Morphology of A1/L12/D022 Three-Phase Microstructure in Ni-V-X (X=Si, Al) Alloy

Takao Kozakai; Daisuke Sakurai; Minoru Doi

doi:10.4028/www.scientific.net/SSP.172-174.236

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HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Substitution Effect of the Third Element X on the...

Substitution Effect of the Third Element X on the Morphology of A1/L1₂/D0₂₂ Three-Phase Microstructure in Ni-V-X (X=Si, Al) Alloy

Abstract:

Morphology of phase-separated microstructure consisting of cubic disordered A1 and ordered L1₂ phases and tetragonal ordered D0₂₂ phase in Ni-V-X (X=Al, Si) alloys has been investigated by transmission electron microscopy. Ternary Ni-V-Al alloy showed the lamellar structure of D0₂₂ phase with spherical L1₂ particles, while Ni-V-Si ternary alloy indicated the anisotropic microstructure consisting of plate- or diamond-shaped D0₂₂ and plate-shaped L1₂ phases. When a part of element Al is substituted by Si, the morphology of three-phase microstructure (A1/L1₂/D0₂₂) varied depending on the amount of element substitution. When Ni-16.1V-4.0Al-2.8Si (at.%) alloy was aged at 1173K for long time, D0₂₂ plate-like particle aligned along <110> direction and L1₂ particles formed between them in the shape of sphere. In the case of Ni-16.6V-2.8Al-4.0Si (at%) alloy more substituted for Al by Si, cuboidal L1₂ phases were first formed aligning along <100> direction and then plate-shaped D0₂₂ phases precipitated along the <100> direction in the channel of cuboidal L1₂particles. Such morphological changes with the substitution of the third elements X by Al or Si were able to be explained based on lattice mismatch.

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Solid State Phenomena (Volumes 172-174)

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236-241

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.236

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Online since:

June 2011

Authors:

Takao Kozakai, Daisuke Sakurai, Minoru Doi

Keywords:

Elastic Strain, Lattice Mismatch, Superalloy, TEM, Variant Selection, γ', γ'', γʹ

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