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A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites
Author(s) -
Jiang Ru,
Yang Lingwei,
Liu Haitao,
Tan Wei,
Sun Xun,
Cheng Haifeng,
Mao Weiguo
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15473
Subject(s) - materials science , composite material , brittleness , sintering , composite number , nanoindentation , oxide , microscale chemistry , deformation (meteorology) , metallurgy , mathematics education , mathematics
A novel methodology combining multiscale mechanical testing and finite element modeling is proposed to quantify the sintering temperature‐dependent mechanical properties of oxide matrix composites, like aluminosilicate (AS) fiber reinforced Al 2 O 3 matrix (AS f /Al 2 O 3 ) composite in this work. The results showed a high‐temperature sensitivity in the modulus/strength of AS fiber and Al 2 O 3 matrix due to their phase transitions at 1200°C, as revealed by instrumented nanoindentation technique. The interfacial strength, as measured by a novel fiber push‐in technique, was also temperature‐dependent. Specially at 1200°C, an interfacial phase reaction was observed, which bonded the interface tightly, as a result, the interfacial shear strength was up to ≈450 MPa. Employing the measured micro‐mechanical parameters of the composite constituents enabled the prediction of deformation mechanism of the composite in microscale, which suggested a dominant role of interface on the ductile/brittle behavior of the composite in tension and shear. Accordingly, the AS f /Al 2 O 3 composite exhibited a ductile‐to‐brittle transition as the sintering temperature increased from 800 to 1200°C, due to the prohibition of interfacial debonding at higher temperatures, in good agreement with numerical predictions. The proposed multiscale methodology provides a powerful tool to study the mechanical properties of oxide matrix composites qualitatively and quantitatively.