Abstract
Studies of commercial PSZ show that fractography is quite feasible. Although the fracture was predominately transgranular, it commonly originated from grain‐boundary facets. This behavior indicates that strengths are controlled by energies less than those for polycrystalline fracture and are limited by grain boundaries. Appropriate heat treatment under reducing conditions gave strengths up to ≅ 600 MPa; Stoichiometry appears to be important.
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