LAUSR

Abstract An Nb–Si– X ( X = Ti, Mo, Hf, Zr, Al, Cr) in situ composite material with the structure formed by directional solidification is subjected o creep tests during tension in vacuum at a temperature of 1300°C. The creep strength at a residual strain tolerance of 1% in 100 h $$\left( {\sigma _{{1/100}}^{{1300}}} \right) = 24\,\,{\text{MPa}}$$ and the exponent in the stress dependence of the steady-state creep rate $${{\dot {\varepsilon }}_{{\text{c}}}}$$ = A σ n ( n = 2.35) are determined. The creep of the composite material under the experimental conditions is shown to occur via a dislocation mechanism fully or partly, since dislocation networks in the matrix and silicides and dislocations in slip bands are observed.