On the composition of microtwins in a single crystal nickel-based superalloy

Correlative analysis is performed using atom probe tomography and high resolution transmission Kikuchi diffraction techniques on microtwins of ∼10nm thickness, in a ⟨011⟩-orientated single crystal superalloy crept at 800°C and 650MPa. Composition profiles across the microtwins and microtwin-parent b...

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Published inScripta materialia Vol. 127; pp. 37 - 40
Main Authors Barba, D., Pedrazzini, S., Vilalta-Clemente, A., Wilkinson, A.J., Moody, M.P., Bagot, P.A.J., Jérusalem, A., Reed, R.C.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.01.2017
Subjects
Atom probe tomography
Chromium
Enrichment
Microtwins
Molybdenum
Ni-based superalloy
Nickel base alloys
Single crystals
Superalloys
Thickness
Transmission Kikuchi diffraction
Twinning
Transmission Kikuchi diffraction
Twinning
Ni-based superalloy
Atom probe tomography
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Summary:Correlative analysis is performed using atom probe tomography and high resolution transmission Kikuchi diffraction techniques on microtwins of ∼10nm thickness, in a ⟨011⟩-orientated single crystal superalloy crept at 800°C and 650MPa. Composition profiles across the microtwins and microtwin-parent boundaries are presented. Enrichment of microtwin-parent interfaces by approximately 2at.% Cr and 1at.% Co within the γ′-phase is found; no compositional variations of other elements – Ta, Nb, Mo, W – are detected. Our results provide unique insights into the mechanism of microtwin formation and the likely influence of alloy composition on deformation kinetics. [Display omitted]
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ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2016.08.029