The strength and fracture of fully dense polycrystalline magnesium oxide

作者：Anthony Glyn Evans, R. W. Davidge · 发表于：Philosophical magazine · 年份：1969 · DOI：10.1080/14786436908228708 · 被引用次数：67 · 研究领域：Advanced ceramic materials synthesis、Advanced materials and composites、Metal and Thin Film Mechanics

The fracture of fully dense, polycrystalline MgO with grain sizes 10 to 500μm, has been studied. Specimens had chemically polished, machined or annealed surfaces. Fracture in chemically polished specimens is initiated by plastic flow, whilst that in machined specimens occurs by the extension of the flaws produced by machining. The fracture of annealed specimens is either initiated by plastic flow or occurs by the extension of the surface flaws, depending on the grain size. The implications of these observations to the strengthening of ceramics are considered.