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Residual stress originated from thermal expansion mismatch determines the mechanical properties of ceramic matrix composites (CMCs). Here, continuous SiC fiber reinforced SiC matrix (SiCf/SiC) composites were fabricated by nano-infiltration and transient eutectic-phase (NITE) method, and the residual stress of the composites was investigated using high-temperature Raman spectrometer. With temperature increasing from room temperature to 1400 ℃, the residual stresses of the matrix and the fiber decrease from 1.29 to 0.62 GPa and from 0.84 to 0.55 GPa in compression respectively, while that of the interphase decreases from 0.16 to 0.10 GPa in tension. The variation of residual stress shows little effect on the tensile strength of the composites, while causes a slight decrease in the tensile strain. The suppression of fiber/matrix debonding and fiber pulling-out caused by the residual stress reduction in the interphase is responsible for the decreasing tensile strain. This work can open up new alternatives for residual stress analysis in CMCs.


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Residual stress variation in SiCf/SiC composite during heat treatment and its effects on mechanical behavior

Show Author's information Xiaowu CHENa,b( )Guofeng CHENGcJunmin ZHANGa,b,dFeiyu GUOa,b,dHaijun ZHOUa,bChunjin LIAOa,bHongda WANGa,bXiangyu ZHANGa,bShaoming DONGa,b
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Analysis and Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China

Abstract

Residual stress originated from thermal expansion mismatch determines the mechanical properties of ceramic matrix composites (CMCs). Here, continuous SiC fiber reinforced SiC matrix (SiCf/SiC) composites were fabricated by nano-infiltration and transient eutectic-phase (NITE) method, and the residual stress of the composites was investigated using high-temperature Raman spectrometer. With temperature increasing from room temperature to 1400 ℃, the residual stresses of the matrix and the fiber decrease from 1.29 to 0.62 GPa and from 0.84 to 0.55 GPa in compression respectively, while that of the interphase decreases from 0.16 to 0.10 GPa in tension. The variation of residual stress shows little effect on the tensile strength of the composites, while causes a slight decrease in the tensile strain. The suppression of fiber/matrix debonding and fiber pulling-out caused by the residual stress reduction in the interphase is responsible for the decreasing tensile strain. This work can open up new alternatives for residual stress analysis in CMCs.

Keywords: mechanical properties, residual stress, nano-powder infiltration and transient eutectoid (NITE), Raman spectroscopy

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Publication history
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Publication history

Received: 01 April 2020
Revised: 24 May 2020
Accepted: 08 June 2020
Published: 25 July 2020
Issue date: October 2020

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© The author(s) 2020

Acknowledgements

Authors appreciate the financial support of the research grant from National Natural Science Foundation of China (No. 51902328), the research grant from Science and Technology Commission of Shanghai Municipality (No. 19ZR1464700), and the research grant from Key Program of the Chinese Academy of Sciences (No. ZDRW-CN- 2017-1).

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