Microstructure investigations of Pt-modified γ′-Ni3Al + γ-Ni coatings on Ni-based superalloys

Cao, Guanghui; Ou, Taoping; Russell, Alan; Jiang, Hua; Russell, Alan

Microstructure investigations of Pt-modified γ′-Ni3Al + γ-Ni coatings on Ni-based superalloys

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2010_CaoG_MicrostructureInvestigations.pdf (790.9 KB)

Date

2010-01-01

Authors

Cao, Guanghui

Ou, Taoping

Russell, Alan

Jiang, Hua

Russell, Alan

Authors

Person

Russell, Alan

Professor

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Organizational Unit

Materials Science and Engineering

Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.

Department

Materials Science and Engineering

Abstract

The microstructure of Pt-modified γ′-Ni₃Al + γ-Ni coating on CMSX-4 single-crystal superalloy has been investigated by transmission electron microscopy (TEM). Cross-sectional TEM analyses showed the presence of precipitates in the coating. This precipitate was identified as the hexagonal topologically close-packed (TCP) μ phase with lattice parameters a = 0.473 nm and c = 2.565 nm. The energy-dispersive x-ray (EDX) spectrum of the μ phase suggested a refractory element rich compound comprising the elements Re, W, and Co. Twin domains parallel to (001) were found in the μ phase. The mechanisms of the μ phase and twinning formation were discussed.

Comments

This article is from Journal of Materials Research 25 (2010): 1191–1195, doi:10.1557/JMR.2010.0148. Posted with permission.

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Fri Jan 01 00:00:00 UTC 2010

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