... at1 923 K; 2, annealed at 22 73 K. Reprinted from Ref. [53].8 .2 Alloys of Refractory Metals 151Fig. 8.9 The effect of stress on thesteady-state creep in molybdenum attemperatures: 1, 1973; 2, ... structure.8 .2 Alloys of Refractory Metals 153Fig. 8. 12 Logarithm steady-stage creep rate versus thelogarithm stress for W–4Re–0.32HfC alloy. The testingtemperatures are B, 22 00; C, 23 00; D, 24 00 ... 44Nb–35Ti–6Al–5Cr–8V–1W–0.5Mo–0.3Hf. The microstructure of extruded and recrystallized material consists of a solid solution and of particles of titanium carbide, TiC. The particle sizesare between 20 0 and 500 nm. Creep curves...