fa گروه سرامیک Ceramic Materials and Engineering Research Paper Research Paper Fracture behavior of a 7075 aluminium alloy reinforced with 15 Vol%. SiC particles was studied after T6 and annealing heat treatments under uniaxial tensile loading at room temperature. The scanning electron microscopy of fractured surfaces and EDS analysis showed:, that fracture mechanism changed from due mainly to fractured particle in T6 condition to interface decohesion in samples in annealed state. Different fracture mechanisms in annealed and T6 conditions can be ascribed mainly to the significant difference in the stress concentration levels around the particles. In T6 condition, very high local stress sufficient to cause fracture of particle can be generated during loading, while the presence of large precipitates at the particle/matrix interface produced interface decohesion leading to final fracture in the annealed state. particle,reinforced composite, particle fracture, interface decoheion, particle/matrix interface 9 15 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-1-50&slc_lang=fa&sid=1 RAZAGHIAN A. 18003194753284600121 18003194753284600121 Yes YU D. 18003194753284600122 18003194753284600122 No CHANDRA T. 18003194753284600123 18003194753284600123 No