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In Situ Transmission Electron Microscopy Investigation of Continuous Precipitation of Ni 3Mo in a Superalloy Formed by Direct Current Magnetron Sputtering

15 Pages Posted: 9 Jul 2019 First Look: Accepted

See all articles by Megan G. Emigh

Megan G. Emigh

University of Illinois at Urbana-Champaign - Department of Materials Science and Engineering

Jessica A. Krogstad

University of Illinois at Urbana-Champaign - Frederick Seitz Materials Research Laboratory

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 650ÂșC. 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: Precipitation, transmission electron microscopy, nickel alloys, lattice defects, phase transformation kinetics

Suggested Citation

Emigh, Megan G. and Krogstad, Jessica A., In Situ Transmission Electron Microscopy Investigation of Continuous Precipitation of Ni 3Mo in a Superalloy Formed by Direct Current Magnetron Sputtering. Available at SSRN: https://ssrn.com/abstract=3414707

Megan G. Emigh (Contact Author)

University of Illinois at Urbana-Champaign - Department of Materials Science and Engineering

601 E John St
Champaign, IL 61820
United States

Jessica A. Krogstad

University of Illinois at Urbana-Champaign - Frederick Seitz Materials Research Laboratory ( email )

Urbana, IL
United States

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