In situ transmission electron microscopy investigation of continuous precipitation of Ni3Mo in a superalloy formed by direct current magnetron sputtering

Megan G. Emigh; Jessica A. Krogstad

doi:10.1016/j.scriptamat.2019.07.028

In situ transmission electron microscopy investigation of continuous precipitation of Ni₃Mo in a superalloy formed by direct current magnetron sputtering

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Abstract

In situ heating experiments explore a correlation between hexagonal close-packed (HCP) domains in sputter-deposited Ni-25Mo-8Cr films and the precipitation of HCP-type structures (Ni₃Mo). Dynamic observation of phase evolution in diffraction mode confirms that precipitation behavior in these defect-dense thin films is not merely kinetically accelerated; instead, the pathway is fundamentally altered. Short-range ordering (SRO) behavior was observed upon reaching 650 °C. SRO has been documented as part of the face-centered cubic (FCC)-precipitation pathway, but has not previously been reported for HCP-based precipitates. This effort provides evidence for continuous ordering of HCP-based precipitates from SRO domains in a mixed FCC-HCP metallic material.

Original language	English (US)
Pages (from-to)	66-69
Number of pages	4
Journal	Scripta Materialia
Volume	173
DOIs	https://doi.org/10.1016/j.scriptamat.2019.07.028
State	Published - Dec 2019

Keywords

Lattice defects
Nickel alloys
Phase transformation kinetics
Precipitation
Transmission electron microscopy

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Online availability

10.1016/j.scriptamat.2019.07.028

Library availability

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Cite this

@article{158c4741796a48f0a2ad7c9fb93c0c7a,

title = "In situ transmission electron microscopy investigation of continuous precipitation of Ni3Mo in a superalloy formed by direct current magnetron sputtering",

abstract = "In situ heating experiments explore a correlation between hexagonal close-packed (HCP) domains in sputter-deposited Ni-25Mo-8Cr films and the precipitation of HCP-type structures (Ni3Mo). Dynamic observation of phase evolution in diffraction mode confirms that precipitation behavior in these defect-dense thin films is not merely kinetically accelerated; instead, the pathway is fundamentally altered. Short-range ordering (SRO) behavior was observed upon reaching 650 °C. SRO has been documented as part of the face-centered cubic (FCC)-precipitation pathway, but has not previously been reported for HCP-based precipitates. This effort provides evidence for continuous ordering of HCP-based precipitates from SRO domains in a mixed FCC-HCP metallic material.",

keywords = "Lattice defects, Nickel alloys, Phase transformation kinetics, Precipitation, Transmission electron microscopy",

author = "Emigh, {Megan G.} and Krogstad, {Jessica A.}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = dec,

doi = "10.1016/j.scriptamat.2019.07.028",

language = "English (US)",

volume = "173",

pages = "66--69",

journal = "Scripta Materialia",

issn = "1359-6462",

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T1 - In situ transmission electron microscopy investigation of continuous precipitation of Ni3Mo in a superalloy formed by direct current magnetron sputtering

AU - Emigh, Megan G.

AU - Krogstad, Jessica A.

PY - 2019/12

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N2 - In situ heating experiments explore a correlation between hexagonal close-packed (HCP) domains in sputter-deposited Ni-25Mo-8Cr films and the precipitation of HCP-type structures (Ni3Mo). Dynamic observation of phase evolution in diffraction mode confirms that precipitation behavior in these defect-dense thin films is not merely kinetically accelerated; instead, the pathway is fundamentally altered. Short-range ordering (SRO) behavior was observed upon reaching 650 °C. SRO has been documented as part of the face-centered cubic (FCC)-precipitation pathway, but has not previously been reported for HCP-based precipitates. This effort provides evidence for continuous ordering of HCP-based precipitates from SRO domains in a mixed FCC-HCP metallic material.

AB - In situ heating experiments explore a correlation between hexagonal close-packed (HCP) domains in sputter-deposited Ni-25Mo-8Cr films and the precipitation of HCP-type structures (Ni3Mo). Dynamic observation of phase evolution in diffraction mode confirms that precipitation behavior in these defect-dense thin films is not merely kinetically accelerated; instead, the pathway is fundamentally altered. Short-range ordering (SRO) behavior was observed upon reaching 650 °C. SRO has been documented as part of the face-centered cubic (FCC)-precipitation pathway, but has not previously been reported for HCP-based precipitates. This effort provides evidence for continuous ordering of HCP-based precipitates from SRO domains in a mixed FCC-HCP metallic material.

KW - Lattice defects

KW - Nickel alloys

KW - Phase transformation kinetics

KW - Precipitation

KW - Transmission electron microscopy

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