2017
DOI: 10.1111/jace.15229
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Enhanced fracture toughness in nonstoichiometric magnesium aluminate spinel through controlled dissolution of second phase alumina

Abstract: Dissolution of Al2O3 particles into a MgAl2O4 (spinel) matrix is accompanied by a volumetric expansion that is predicted to lead to a compressive stress field upon cooling, resulting in a promising microstructure for enhanced toughening of transparent spinel. This study explores the conditions to form such a microstructure by hot‐pressing powders of Al2O3 and spinel, at temperatures that promote dissolution of the Al2O3. Tough, particulate‐reinforced composites were formed under lower temperatures and shorter … Show more

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