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

SCRIPTA MATERIALIA

卷:127

Article

Barba, D.¹  Pedrazzini, S.²  Vilalta-Clemente, A.²  Wilkinson, A. J.²  Moody, M. P.²  Bagot, P. A. J.²  Jerusalem, A.¹  Reed, R. C.^1,2 

[1] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

[2] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

关键词: Ni-based superalloy;    Twinning;    Transmission Kikuchi diffraction;    Atom probe tomography;   

DOI  :  10.1016/j.scriptamat.2016.08.029

来源: Elsevier

【 摘 要 】

Correlative analysis is performed using atom probe tomography and high resolution transmission Kikuchi diffraction techniques on microtwins of similar to 10 nm thickness, in a < 011 >-orientated single crystal superalloy crept at 800 degrees C and 650 MPa. Composition profiles across the microtwins and microtwin-parent boundaries are presented. Enrichment of microtwin-parent interfaces by approximately 2 at.% Cr and 1 at.% Co within the gamma-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. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

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