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Metallography, Microstructure, and Analysis
Published in: Metallography, Microstructure, and Analysis 5/2019

10-09-2019 | Technical Article

On the Role of Superlattice Structures with Ni3X-type Composition in Selected Ni-Based Superalloys with Commercial Grades

Author: H. M. Tawancy

Published in: Metallography, Microstructure, and Analysis | Issue 5/2019

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Abstract

Close-packed superlattice derivatives of the face-centered cubic (fcc) structure with Ni3X-type composition in some commercial Ni-based superalloys have been characterized, and their effect on tensile strength has been determined. Both the L12 and DO22 superlattices can form directly from the fcc structure by minor atoms rearrangement. However, the two superlattices can act as transient metastable phases which transform into more stable superlattices (L12 → DO24 and DO22 → D0a) with extended thermal exposure at elevated temperatures. It is shown that the stability and morphology of each superlattice are dependent upon the alloy composition. Although some superlattices produce adverse effects on tensile strength, others are found to have beneficial effects. The exact effect is correlated with the particular morphology and deformation mode. It is concluded that the DO22 superlattice can form the basis for designing alloys deformable by twinning and combine high strength and high ductility.
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Metadata
Title
On the Role of Superlattice Structures with Ni3X-type Composition in Selected Ni-Based Superalloys with Commercial Grades
Author
H. M. Tawancy
Publication date
10-09-2019
Publisher
Springer US
Published in
Metallography, Microstructure, and Analysis / Issue 5/2019
Print ISSN: 2192-9262
Electronic ISSN: 2192-9270
DOI
https://doi.org/10.1007/s13632-019-00571-y

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