Effect of tungsten matrix on the mechanical property of SiC fiber reinforced tungsten composites with foils fabricated at 1700 °C

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4. Conclusion

Continuous SiC fiber reinforced W composites with 0.05 mm or

0.08 mm foil as matrix were fabricated at 1700 ◦ C successfully. Foils

have recrystallized after sintering in this work based on the results of

annealing evaluation. Therefore there is no contribution for ductility of

composites from foil. The tensile test measured at RT, lower than the

DBTT of W, implies that the composites obtained with 0.08 foil showed

better apparent pseudo-ductile behavior due to the short pull-out foil

and higher UTS of 197 MPa owing to high relative density and more

remained W, suggesting that using dense foil as matrix is an efficient

way to reduce the reaction rate. Thus SiC fiber as reinforcement is one of

the successful methods to ameliorate the embrittlement of W, and it is

dispensable to consider the DBTT and recrystallization temperature.

Moreover, it is expected that pseudo-ductile behavior will be obtained

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