1995 Volume 59 Issue 5 Pages 487-491
Age hardening and precipitation processes in an Al-0.23 mass%Sc alloy were studied by hardness and electric resistivity measurements and by TEM observation. Stable, coherent L12-Al3Sc phase precipitates directly from a supersaturated solid solution without the formation of any metastable phases. A plot of the cube of the particle radius against aging time follows a straight line, suggesting that the coarsening process obeys the LSW theory of diffusion controlled particle coarsening. The apparent activation energy for the precipitation of the Al3Sc phase as determined by resistivity measurement is 76 kJ/mol.
