期刊论文详细信息
SCRIPTA MATERIALIA 卷:154
Elemental partitioning and site-occupancy in γ/γ′ forming Co-Ti-Mo and Co-Ti-Cr alloys
Article
Im, Hye Ji1  Makineni, Surendra K.2  Gault, Baptiste2  Stein, Frank2  Raabe, Dierk2  Choi, Pyuck-Pa1 
[1] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, 291 Daehak Ro, Daejeon 34141, South Korea
[2] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany
关键词: Co-based superalloy;    Solute partitioning;    Atom probe tomography (APT);    Site occupancy;   
DOI  :  10.1016/j.scriptamat.2018.05.041
来源: Elsevier
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【 摘 要 】

We report on the sub-nanometer scale characterization of Co-12Ti-4Mo and Co-12Ti-4Cr (at.%) model alloys. Atom probe tomography reveals that Co and Cr partition to gamma, whereas Ti and Mo to gamma'. Additions of Mo and Cr to the reference Co-12Ti system lead to strong increases in gamma' volume fraction by about 25% and 12%, respectively. Element-specific spatial distribution maps along the [001] direction of the L1(2)-ordered gamma' phase reveal that both Mo and Cr preferentially replace Ti on its sublattice. The remaining excess Ti is available for formation of additional gamma', resulting in enhanced gamma' volume fractions. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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