Composite Materials Research Progress

286
S.C. Tjong
stress is temperature dependent. By plotting the lattice diffusion compensated creep rate
(ε& /DL) against the modulus-compensated effective stress (σ -σo/E), the datum points for all
temperatures merge into a straight line with a slope of 8 (Fig. 12). This implies that the creep
rate of the Al/1vol.%Si-N-C nanocomposite is subgrain forming dislocation creep controlled
by lattice-diffusion.
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Figure 11. Variation of ε& with applied stress on double linear scales for Al/1vol.%Si-N-C (25 nm)
nanocomposite [41].
Figure 12. Variation of diffusivity normalized steady creep rate, ε& /D L, with modulus-compensated
effective stress, σ -σ o/E, on double logarithmic coordinates for Al/1vol.%Si-N-C (25 nm)
nanocomposite [41].