Orientation of nickel-based alloy after thermal treatment

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 at % each. W and Mo are present in a smaller amount. The alloy structur...

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Bibliographic Details
Main Authors: Nikonenko, Elena, Popova, Natalya, Koneva, Nina, Qin, Rongshan, Gromov, Victor
Format: Conference Proceeding
Language:English
Subjects:
Alloying elements
Annealing
Cobalt base alloys
Crystallization
Grain orientation
Heat treatment
Microstructure
Morphology
Nickel base alloys
Phase transitions
Transmission electron microscopy
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Summary: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 at % 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°C) and (2) original state subjected to subsequent annealing within 900–1000°C 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.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5013829