期刊
ACTA MATERIALIA
卷 57, 期 20, 页码 6251-6267出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.08.053
关键词
Nickel alloys; Microstructure; Serial sectioning; Precipitate shape; Moment invariants
资金
- ONR/DARPA Dynamic 3-D Digital Structure program [2626753]
- Air Force Office of Scientific Research award [FA95500710179]
- Material & Manufacturing Directorate
- AFOSR
Focused ion beam serial sectioning was used to study the three-dimensional morphology of secondary gamma' precipitates in two nickel-based superalloys: Rene-88 DT, a turbine disk alloy, and UMF-20, an experimental alloy. The precipitate morphology was reconstructed using a multi-step image-processing approach, including registration, intensity corrections, segmentation and segmentation cleanup. A total of 260 dendritic precipitates were obtained for the Rene-88 DT alloy, and 477 cuboidal precipitates in the UMF-20 alloy. The shapes of these precipitates were analyzed by means of moment invariants. The cuboidal precipitates in UMF-20 are well described by an analytical superellipsoid model. The morphological evolution of the dendritic precipitates in Rene-88 DT is analyzed by combining the affine moment invariant with the dimensionless shape quotient. This approach is promising as an objective tool for the description of complex precipitate shapes. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据