The effect of residual stress on whisker reinforcements in SiCw-Al2O3 composites during cooling
The effect of residual stress on whisker reinforcements in SiCw-Al2O3 composites during cooling
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SiCw-Al2O3复合材料冷却过程中残余应力对晶须增强体的影响
DOI：
10.1016/j.jallcom.2017.07.192
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发表时间：
2017-11
影响因子：
6.2
通讯作者：
Zhipeng Xie
中科院分区：
文献类型：
--
作者：
Weiwei Wu;Jingya Gui;Tianbin Zhu;Zhipeng Xie
研究了293 ~ 77 K时残余应力对sicw - al2o3复合材料晶须增强的影响。77 K时sicw - al2o3复合材料的断裂韧性比293 K时提高了约26%。计算得到77 K时SiC晶须的压缩应力为~ 600 MPa，并通过原位曼光谱和荧光光谱证实了局部应力的分布。测定了r曲线行为和裂纹张开位移曲线，比较了不同温度下残余应力对裂纹桥接的影响。实验结果证实，在77 K的残余应力作用下，sicw - al2o3复合材料的裂纹桥接能力增强，是一种很有前景的低温材料。
The effect of residual stress on whisker reinforcements in SiCw-Al2O3composites from 293 K to 77 K was investigated. The fracture toughness of SiCw-Al2O3composites measured at 77 K was ∼26% higher than that at 293 K. The calculated compressive stress of SiC whiskers at 77 K was ∼600 MPa, and the local stress distribution is demonstrated byin-situRaman spectra and fluorescence spectra.R-Curve behaviors and crack opening displacement profiles were determined to compare the effect of residual stress on crack bridging at different temperatures. The experimental results verified that crack bridging was enhanced by residual stress at 77 K, which made the SiCw-Al2O3composite to be a promising material for cryogenic applications.
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