HIGH-TEMPERATURE MECHANICAL-BEHAVIOR OF STOICHIOMETRIC MAGNESIUM SPINEL

The elastic and mechanical behavior, from room temperature up to 1300 degrees C, of stoichiometric polycrystalline magnesium aluminum spinel is studied, Elastic modulus, fracture toughness, and modulus of ruptu re measurements and observations of polished and fracture surfaces hav e been performed, Two well-differentiated regions of fracture behavior as a function of temperature have been found, In the low-temperature region, this material behaves elastically, whereas in the high-tempera ture (>800 degrees C) region, plastic phenomena take place.