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Residual stress variation in SiC_(f)/SiC composite during heat treatment and its effects on mechanical behavior

查看全文 作　　者：Xiaowu [1,2]CHEN;Guofeng [3]CHENG;Junmin [1,2,4]ZHANG;Feiyu [1,2,4]GUO;Haijun [1,2]ZHOU;Chunjin [1,2]LIAO;Hongda [1,2]WANG;Xiangyu [1,2]ZHANG;Shaoming [1,2]DONG 高影响力作者 机构地区：[1]State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;[2]Structural Ceramics and Composites Engineering Research Center,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;[3]Analysis and Testing Center for Inorganic Materials,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;[4]School of Physical Science and Technology,ShanghaiTech University,Shanghai 200031,China高影响力机构 出　　处：《Journal of Advanced Ceramics》索引2020年第9卷第5期,共9页高影响力期刊 基　　金：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);the research grant from Key Program of the Chinese Academy of Sciences (No.ZDRW-CN2017-1) 摘　　要：Residual stress originated from thermal expansion mismatch determines the mechanical properties of ceramic matrix composites(CMCs).Here,continuous SiC fiber reinforced SiC matrix(SiC_(f)/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. 关 键 词：residual stress nano-powder infiltration and transient eutectoid(NITE) Raman spectroscopy mechanical properties
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