TRANSFORMATION TOUGHENING IN CERAMICS : MECHANICAL PROPERTIES AND TEMPERATURE DEPENDENCE OF TETRAGONAL POLYCRYSTALLINE ZIRCONIA (TZP) G. ORANGE, G. FANTOZZI, Y. BIGAY et J. P. TORREJ. Phys. Colloques, 47 C1 (1986) C1-655-C1-659DOI: https://doi.org/10.1051/jphyscol:19861100