On the diffusive phase transformation mechanism assisted by extended dislocations during creep of a single crystal CoNi-based superalloy

被引：90

作者：

Makineni, Surendra Kumar ^{[1
]}

Kumar, Ankit ^{[1
]}

Lenz, Malte ^{[2
,3
]}

Kontis, Paraskevas ^{[1
]}

Meiners, Thorsten ^{[1
]}

Zenk, Christopher ^{[4
]}

Zaefferer, Stefan ^{[1
]}

Eggeler, Gunther ^{[5
]}

Neumeier, Steffen ^{[4
]}

Spiecker, Erdmann ^{[2
,3
]}

Raabe, Dierk ^{[1
]}

Gault, Baptiste ^{[1
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany

[2] Friedrich Alexander Univ Erlangen Nurnberg, Inst Micro & Nanostruct Res, Cauerstr 6, D-91058 Erlangen, Germany

[3] Friedrich Alexander Univ Erlangen Nurnberg, Ctr Nanoanal & Electron Microscopy CENEM, Cauerstr 6, D-91058 Erlangen, Germany

[4] Friedrich Alexander Univ Erlangen Nurnberg, Inst Gen Mat Properties, Martensstr 1, D-91058 Erlangen, Germany

[5] Ruhr Univ Bochum, Inst Werkstoffe, Univ Str 150, D-44780 Bochum, Germany

来源：

ACTA MATERIALIA | 2018年 / 155卷

关键词：

Superalloys; Creep deformation and stacking faults; Electron channeling contrast imaging (ECCI); Transmission electron microscopy (TEM); Atom probe tomography (APT); FCC/L1(2) 2-PHASE MICROSTRUCTURES; HIGH-TEMPERATURE ALLOYS; NI-BASED SUPERALLOY; W-BASED ALLOYS; INTERMEDIATE TEMPERATURES; STACKING-FAULTS; LATTICE MISFIT; PLANAR DEFECTS; HIGH-STRENGTH; GAMMA'-PHASE;

D O I：

10.1016/j.actamat.2018.05.074

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We propose here a deformation-induced diffusive phase transformation mechanism occurring during shearing of gamma' ordered phase in a gamma/gamma' single crystalline CoNi-based superalloy. Shearing involved the creation and motion of a high density of planar imperfections. Through correlative electron microscopy and atom probe tomography, we captured a superlattice intrinsic stacking fault (SISF) and its associated moving leading partial dislocation (LPD). The structure and composition of these imperfections reveal characteristic chemical structural contrast. The SISF locally exhibits a D0(19) ordered structure coherently embedded in the L-12 gamma' and enriched in W and Co. Interestingly, the LPD is enriched with Cr and Co, while the adjoining planes ahead of the LPD are enriched with Al. Quantitative analysis of the three-dimensional compositional field in the vicinity of imperfections sheds light onto a new in-plane diffusion mechanism as the LPD moves on specific {111)}evier planes upon application of stress at high temperature. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd.

引用

页码：362 / 371

页数：10

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