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The effect of residual stress on whisker reinforcements in SiCw-Al2O3 composites from 293 K to 77 K was investigated. The fracture toughness of SiCw-Al2O3 composites 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 by in-situ Raman spectra and fluorescence spectra. R-Curve...
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