NDLI: RETRACTED ARTICLE: Microstructure of carbide precipitates in L1$_{2}$−Ni$_{3}$Al and L1$

Content Provider	Springer Nature Link
Author	Han, Chang Suk
Copyright Year	2008
Abstract	The crystallographic structures of carbide formed in Ni$_{3}$Al- and TiAl-based intermetallics containing carbon are investigated in this study using transmission electron microscopy. In an L1$_{2}$-ordered Ni$_{3}$Al alloy with 4 mol.% of chromium and 0.2 mol.% to 3.0 mol.% of carbon, fine octahedral precipitates of M$_{23}$C$_{6}$ type carbide were formed in the matrix by aging at temperatures around 973 K after solution annealing at 1423 K. TEM examination revealed that the M$_{23}$C$_{6}$ phase and the matrix lattices have a cube-cube orientation relationship and maintain partial atomic matching at the {111} interface. After prolonged aging or by aging at higher temperatures, the M$_{23}$C$_{6}$ precipitates adopt a rod-like morphology elongated parallel to the <100> directions. In L1$_{0}$-ordered TiAl containing from 0.1 mol.% to 2.0 mol.% carbon, TEM observations reveal that needle-like precipitates, which lie only in one direction parallel to the [001] axis of the L1$_{0}$ matrix appear in the matrix mainly at dislocations. Selected-area electron diffraction (SAED) patterns analyses showed that the needle-shaped precipitate is perovskite-type Ti$_{3}$AlC. The orientation relationship between the Ti$_{3}$AlC and the L1$_{0}$ matrix was found to be (001)$_{Ti3AlC}$//(001)$_{L10 matrix}$ and [010]$_{Ti3AlC}$//[010]$_{L10 matrix}$. By aging at higher temperatures or for a longer period at 1073 K, plate-like precipitates of Ti$_{2}$AlC with a hexagonal structure form on the {111} planes of the L1$_{0}$ matrix. The orientation relationship between the Ti$_{2}$AlC and the L1$_{0}$ matrix is (0001)$_{Ti2AlC}$//(111)$_{L10 matrix}$ and Ti2AlC//L10 matrix.
Starting Page	151
Ending Page	157
Page Count	7
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	14
Issue Number	2
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2008-04-01
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	M$_{23}$C$_{6}$ carbide precipitation perovskite Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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