In situ TEM study of the thermal stability of nanotwinned Ni-Mo-W alloys

Mo-Rigen He; Ruopeng Zhang; Rohan Dhall; Andrew M. Minor; Kevin J. Hemker

doi:10.1080/21663831.2023.2255321

Materials Research Letters (Oct 2023)

In situ TEM study of the thermal stability of nanotwinned Ni-Mo-W alloys

Mo-Rigen He,
Ruopeng Zhang,
Rohan Dhall,
Andrew M. Minor,
Kevin J. Hemker

Affiliations

Mo-Rigen He: Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA
Ruopeng Zhang: Department of Materials Science & Engineering, University of California, Berkeley, CA, USA
Rohan Dhall: Department of Materials Science & Engineering, University of California, Berkeley, CA, USA
Andrew M. Minor: Department of Materials Science & Engineering, University of California, Berkeley, CA, USA
Kevin J. Hemker: Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA

DOI: https://doi.org/10.1080/21663831.2023.2255321
Journal volume & issue: Vol. 11, no. 10
pp. 879 – 887

Abstract

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Microstructural evolution in nanotwinned Ni-Mo-W alloys under in situ heating experiments is investigated in a transmission electron microscope. Migration of twin boundaries and grain boundaries as well as formation of carbide precipitates are observed at various temperatures and characterized at atomic resolution. These transformations are found to occur at temperatures that are ∼200°C lower in Mo-rich (Ni85Mo13W2) specimens than in W-rich (Ni86Mo3W11) specimens, which highlights the different efficacy of Mo and W solutes in stabilizing the nanotwinned structure. Inspection of various mechanisms points to the importance of elastic modulus mismatch as a pathway for enhancing nanotwin stability by alloying.

Published in Materials Research Letters

ISSN: 2166-3831 (Online)
Publisher: Taylor & Francis Group
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.tandfonline.com/journals/tmrl

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