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Five kinds of WSi2/MoSi2 composites were successfully prepared by mechanical alloying, IP and high tempera-ture sintering techniques. And their hardness and fracture toughness were measured by the Vickers indentation fracturemode through an Hv-10A type sclerometer. The microstructure and morphology were investigated by a JSM-56001V scan-ning electron microscope. Results show that the addition of 50% WSi2 (in mole fraction) has remarkable hardening andtoughening effects on the MoSi2 matrix, whose hardness value and fracture toughness value are increased about 60% and86%, respectively. For WSi2/MoSi2 composite, the hardening mechanisms are fine-grain and the second phase particlesstrengthening, and the toughening mechanisms include fine-grain, grain drawing, crack deflection, microbridge and bowingtoughening.
Five kinds of WSi2 / MoSi2 composites were successfully prepared by mechanical alloying, IP and high tempera-ture sintering techniques. And their hardness and fracture toughness were measured by the Vickers indentation fracture mode through an Hv-10A type sclerometer. The microstructure and morphology were investigated Results show that the addition of 50% WSi2 (in mole fractions) has remarkable hardening and toughening effects on the MoSi2 matrix, whose hardness value and fracture toughness values are increased by about 60% and 86%, by a JSM-56001V scan-ning electron microscope. respectively. For WSi2 / MoSi2 composite, the hardening mechanisms are fine-grain and the second phase particles strengthening, and the toughening mechanisms include fine-grain, grain drawing, crack deflection, microbridge and bowing toughening.