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On Interfacial Microstructure Evolution in an Isothermally Exposed SiC Fiber-Reinforced Ti-17 Matrix Composite

Published online by Cambridge University Press:  14 November 2019

Yingwei Fan Open the ORCID record for Yingwei Fan [Opens in a new window]  and
Xiaorong Zhou
Yingwei Fan*
Affiliation:
AECC Beijing Institute of Aeronautical Materials, Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, Key Laboratory of Aeronautical Materials Testing and Evaluation, Aero Engine Corporation of China, Beijing100095, China
Xiaorong Zhou
Affiliation:
School of Materials, University of Manchester, ManchesterM13 9PL, UK
*
*Author for correspondence: Yingwei Fan, E-mail: yingei.fan@yahoo.com
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Abstract

The kinetics and mechanisms of interface reactions in a unidirectional continuous SiC fiber-reinforced Ti-17 matrix composite were investigated using transmission electron microscopy and scanning electron microscopy. It was found that a reaction zone (RZ) consisting of two-layered TiC-type carbide forms at the fiber/matrix interface during fabrication of the composite. After isothermal exposure at elevated temperatures, the two-layered TiC-type carbide is inherited, and a new TiC-type carbide layer forms within the RZ after exposure at temperatures lower than 900°C, while a new Ti3C2-type carbide layer forms after exposure at 900°C. It was also observed that the growth of RZ is a diffusion-controlled and temperature-dependent process, obeying the Fick's law-based parabolic relationship and the Arrhenius equation. Two material constants, the temperature-independent rate constant k0 and activation energy Q, are determined as 31.5 × 10−4µm/s1/2 and 49.9 kJ/mol, respectively.

Keywords

diffusioninterface reactionmetal matrix compositemicrostructurethermal exposure
Type
Materials Science Applications
Information
Microscopy and Microanalysis , Volume 26 , Issue 1 , February 2020 , pp. 18 - 28
Copyright
Copyright © Microscopy Society of America 2019

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