【摘 要】
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Five kinds of WSi2/MoSi2 composites were successfully prepared by mechanical alloying, IP and high temperature sintering techniques. And their hardness and frac
【机 构】
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Institute of Material Surface Engineering,Department of Material Science and Engineering,Research Ce
论文部分内容阅读
Five kinds of WSi2/MoSi2 composites were successfully prepared by mechanical alloying, IP and high temperature 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 by a JSM-5600lV scanning electron microscope. Results show that the addition of 50% WSi2 (in mole fraction) has remarkable hardening and toughening effects on the MoSi2 matrix, whose hardness value and fracture toughness value are increased about 60% and 86%, 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.
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