Creep Deformation of Metals

Also, by plotting ln(s/t) against (1/T), for a given value of N, the activation energy Q can be found from the gradient (-Q/R).The photos below are taken after creeping for one minute. The spacings between the 11th and 12th coils (in mm) are marked.

It may be noted that the calculated activation energy of about 30 kJ mole^-1 is approximately the value for atomic diffusion in solder, as expected.