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The Ostwald ripening of spherical and rod-shaped Cu precipitate particles in an Fe-1.5 mass% Cu alloy aged between 873 and 1023 K has been examined by measuring both the particle size by electron microscopy and the Cu concentration in the α-Fe matrix by electrical resistivity. The average radius of spherical and rod-shaped particles increases with ageing time  t  as  t  1/3 , in agreement with the growth by diffusion-controlled coarsening. The kinetics of the depletion of supersaturation with  t  obey the predicted  t  – 1/3  time law. The Cu/α-Fe interfacial energy and the diffusivity of Cu in α-Fe have been independently derived from the data on coarsening. The interfacial energies are measured as 0.57 and 1.1 Jm –2  for the spherical and rod-shaped particles respectively. The pre-exponential factor and the activation energy for bulk diffusion are found to be 4.54α10  –5  m 2 s – 1  and 241 kJmol  – 1 .

Coarsening kinetics of Cu particles in an Fe-1.5% Cu alloy