The Toughness of Polycrystalline MgAl2O4

Mototsugu SAKAI; Richard C. BRADT; Albert S. KOBAYASHI

doi:10.2109/jcersj.96.525

The Toughness of Polycrystalline MgAl₂O₄

Mototsugu SAKAI, Richard C. BRADT, Albert S. KOBAYASHI

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Keywords: MgAl₂O₄ spinel, Fracture toughness, Macronotch, Microflaw, Process zone, Wake, Grain bridging, Microcracking

JOURNAL FREE ACCESS

1988 Volume 96 Issue 1113 Pages 525-531

DOI https://doi.org/10.2109/jcersj.96.525

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Abstract

The effect of the measurement technique on the apparent fracture toughness, or K_IC value of a transparent polycrystalline MgAl₂O₄ spinel was investigated. Results from macronotched specimens are compared with those of microflaw techniques from room temperature to 1000°C. Contributions of the process zone wake in terms of grain bridging and interlocking frictional effects are qualitatively addressed and the effects of grain size are also discussed.

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