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The hightemperature tensile creep rupture properties of the Nb solid solution insitu composites (Nbss)/Nb5Si3 and Nbss/ Nb5Si3/(Nb, Hf) C have been studied in relation to their chemical compositions and microstructures. The samples were prepared by arc melting. Nbss/Nb5Si3 insitu composites alloyed with Mo and W have a mazelike structure. Small dispersed carbide regions were mainly observed in Nb solid solution and phase boundary in the Nbss/Nb5Si3/(Nb, Hf) C insitu composites. Additionally, carbides precipitated inside the silicide region after the creep rupture test. Hightemperature tensile creep tests were conducted at 1773 K under argon over a stress range from 20 to 200 MPa. We found that Nb16Si5Mo15W5Hf5 C has a high creep rupture strength, with a timetorupture of 477 h at 1773 K under a stress 100 MPa. Addition of W is more effective than Mo to increase on creep strength at 1773 K, and the rupture time was prolonged at lower stress in Nb20Si5Mo5Hf5C tri phase alloy with a dispersion of (Nb, Hf) C carbide particles.

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Effects of Mo, W and (Nb, Hf)C on Creep Rupture Properties of Nb&lt;SUB&gt;ss&lt;/SUB&gt;/Nb&lt;SUB&gt;5&lt;/SUB&gt;Si&lt;SUB&gt;3&lt;/SUB&gt; &lt;I&gt;In-Situ&lt;/I&gt; Composites