Abstract
The effects of a silicate boundary phase on the high‐temperature stress‐strain behavior of MgO materials have been studied using a model system MgO‐CaMgSiO4 (monticellite, CMS). Specimens were fabricated by hot‐pressing, or by hot‐pressing and annealing, and contained up to 15% silicate phase. The boundary phase consisted primarily of CMS. The stress‐strain behavior of these specimens in the range 1200° to 1400°C was strongly dependent on the degree of continuity of the grain boundary phase and on the temperature.
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